is 14871 (2000): products in fibre reinforced cement - long … · 2018. 11. 14. · roofing and...

Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 14871 (2000): Products in Fibre Reinforced Cement - LongCorrugated or Asymmetrical Section Sheets and Fittings forRoofing and Cladding - [CED 53: Cement Matrix Products]

IS 14871:2000

W?69n7m

wwumRmmihmG———mvm’’?l%“Jl* fit TF$tWikl{ m WFm

Tm6twt&---ff@f@Indian Standard

PRODUCTS IN FIBRE REINFORCED CEMENT —LONG CORRUGATED OR ASYMMETRICAL

SECTION SHEETS AND FITTINGS FORROOFING AND CLADDING — SPECIFICATION

ICS 91.100.40

@ BIS 2000

BUREAU OF IN DIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

December 2000 . Price Group 7

Cement Matrix Products Sectional Committee, CED 53

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the CementMatrix Products Sectional Committee had been approved by the Civil Engineering Division Council.

This standard has been formulated to fuifill the need for a specification of non asbestos fibre cement flat sheets.Specially formulated and treated synthetic organic fibres and cellulose fibres have been used in practices for themanufacture of this product.

In the formulation of this standard, due weightage has also been given to the international coordination amongthe standards and practices in different countries in addition to relating it to the practices in the field in thiscountry. This has been achieved by deriving assistance from:

a) 1S0 9933:1995 Products in fibre-reinforced cement — Long corrugat&dor asymmertical section sheetsand fittings for roofing and claddhg, International Organization for Standardization

b) 1S0 390:1993 Products in fibre-reinforced cement — Sampling and inspection, International Organiza-tion for Standardization.

The composition of the technical committee responsible for formulation of this standard is given at Annex E.

For the purpose of deciding whether a particular requirement of this standard is compiled with, the final value,observed or calculated, expressing the result of a test shall be rounded off in accordance with IS 2:1960 ‘Rulesfor rounding off numerical values (revised)’. The number of significant places retained in the rounded off valueshould be the same as that of the specified value in this standard.

IS 14871:2000

Indian Standard

PRODUCTS IN FIBRE REINFORCED CEMENT —LONG CORRUGATED OR ASYMMETRICAL

SECTION SHEETS AND FITTINGS FORROOFING AND CLADDING — SPECIFICATION

1 SCOPE

1.1 This standard covers the requirements for straightfibre cement profiled sheets of more than 0.9 m length,and their fittings used as roofing and claddingmaterials. It also specifies tests for checking thesecharacteristics as well as marking and conditions foracceptance.

1.2 Some of these requirements may apply, afteragreement between the manufacturer and thepurchaser, to curved corrugated sheets.

1.3 This standard does not apply to asbestos cementprofiled sheets which are covered by IS 459.

2 REFERENCES

The Indian Standards given in Annex A containprovisions which, through reference in this text,constitute provisions of this standard. At the time ofpublication, the editions indicated were valid. Allstandards are subject to revision, and parties toagreements based on this standard are encouraged toinvestigate the possibility of applying the most recenteditions of the standards indicated in Annex A.

3 TERMINOLOGY

For the purpose of this standard, the followingdefinitions shall apply.

3.1 Acceptance Test — Test to establish whether abatch of products conforms to a specification. The testsare performed on samples drawn either fromcontinuous production or from a consignment.

3.2 Type Test — Test concerned with the approvalof a new product and/or a fundamental change informulation and/or method of manufacture fromwhich the effects cannot be predicted on the basis ofprevious experience.

The test is performed on the as-delivered product. Thetest is required to demonstrate conformity of a genericproduct to a specification.

3.3 Acceptable Quality Level (AQL) — When acontinuous series of lots are considered, the quality

level which for the purposes of sampling inspection isthe limit of a satisfactory process average’)

3.4 As-Delivered — In the same condition as theproducer intends to supply the product aftercompleting all aspects of the process includingmaturing and when appropriate, painting.

3.5 Fibres

a) Discrete elements randomly dispersed,b) Continuous strands and tapes, andc) Nets or webs.

3.6 Breaking Load — Maximum load achievedduring the bending test and representing theload-bearing capacity of the sheets at the test span.

4 SYMBOLS, ABBREVIATIONS AND UNITS

For the purpose of this standard the following lettersymbols shall have the meaning indicated againsteach, where other symbols are used, they are explainedat the appropriate place.

a —

e,el, e2 —

ffo.2

fo.7

Ahhd

hom

LL1

L,

——

—

———

—

Pitch of the corrugation, in mmThickness of the sheet, in mmDeflection, in mm, in the breaking load testDeflection, in mm, at 20 percent of thespecified load in the breaking load testDeflection, in mm, at 70 percent of thespecified load in the breaking load test

h.7 -A.2s in mmHeight of the corrugation, in mmHeight of the edge of the descendingcorrugation at edge, in mmHeight of the-edge of ascendingcorrugation at edge, in mm

— Ratio of the estimation f, to 1,— Upper estimation at 95 percent confglence

levelof the result Ml in the warm water test— Lower estimation at 95 percent

confidence level of the result M2 in thewarm water test

1,,12,[B — Lengths of the sheet, in mm1 — Clear span, in mm, between the supports

in the breaking bending moment test1JA~m~lin~~che~~~ittrm AQL of 4 percent means that batches

containing up to 4 pereent defective items have a high probabilityof acceptance.

IS 14871:2000

WI, W’2,—w~

Ml

Mz

m

P

P,s,

S2

v

w

we

P

—

—

—

—

——

—

—

—

——

Widths of the sheet, in mm

Average value of the test result of thecontrol specimen of the first lot for thewarm water testAverage value of the test result of thespecimens after the warm water testMass of the specimen, in g, after dryingwhen determining the apparent densityBreaking load, in N, for the bendingmoment testBreaking load per metre width, in N/mStandard deviation of the specimens withaverage MlStandard deviation of the specimens withaverage it42Apparent volume, in cm3, of thespecimens for the apparent density testWidth of the sheet for the breaking loadtest in mEffective widthApparent densit~of specimen, in g/cm3

5 SHEETS

5.1 General Composition

The product shall be composed essentially of aninorganic hydraulic binder (see Note) or a calciumsilicate binder formed by the chemical reaction of asiliceous (includes ground silica, pulverized fuel ashand amorphous silica) and calcareous materialreinforced by organic fibres andlor inorganic syntheticfibres. Pozzolanic materials, process aids, tillers and

pigments which are compatible with the fibrereinforced cement may be added. The inorganichydraulic binder shall be either 33 grade ordinaryPortland cement conforming to IS 269 or 43 gradeordinary Portland cement conforming toIS811 2 or 53grade ordinary Portland cement conforming toIS 12269 or Portland pozzolana (fly ash based) cementconforming to IS 1489 (Part 1) or Portland pozzolanacement (calcined clay based) conforming to IS 1489(Part 2) or rapid hardening cement conforming to IS8041 or Portland slag cement conforming to IS 455.Fly ash used shall be conforming to IS 3812.

NOTE — In case of Portland pozzoksnacement and Portlandslag cement, addition of pozzolanic materials and slag shall notbe permitted.

5.2 General Appearance and Fhdsh

The surface of the sheets intended to be exposed to theweather shall be generally of smooth finish. Variationsof the surface appearance, due to the method ofmanufacture, which do not impair the strength orperformance of the sheets, are permitted.

The sheets may be left with their natural colour orcolouring matter may be added in the composition.They may also receive adherent coloured oruncolored coating in their either side surfaces.

5.3 Classification

5.3.1 According to Nominal Height of Corrugations

The sheets shall be of categories based on height oftheir corrugations, h (see Fig. 1) and minimumthickness, e in accordance with Table 1.

1- a -1

~ SMOOTHFACE

SMOOTHFACE

**

FIG. 1 GENERALPROFILESOFLONGCORRUGATEDOR ASYMMETRICALSECTIONSHEETS

2

Is 14871:2000

Table 1 Category and Class (Minimum Breaking Load in N/m)(Clauses 5.3.1,5.3.3, C-1.2.1 and C-4)

Category Minimum ClassThickness, A

c \e, mm

1 2 3 4 5 6 7 8 9 10A(15mm<h555mm) 3 6(N3 800 1000 1400 — — — — — —B(25mm<h<55mm) 4 — — 1000 1400 2000 2500 3300 — — —C(40mm<h<80mm) 4.5 — — — 1400 2000 2500 3300 4250 — —D(tX)orrn< h<150mrn) 5.5 — — — — — — 3300 4250 5600 7400

NC)TE— The sheets being commonly manufactured in India at the time of formulation of this standard fall under Category B and Cand Class 7.

5.3.2 According to Thickness

Type A—The thickness of the sheets shall beapproximately constant throughout the width ofprofile (see Fig. 2).

Type B—The thickness of the sheets shall varyregularly between the valley and the crown forcorrugated sheets or between the lower part and theupper part of ribs for asymmetrical section sheets, inthe same cross-section (see Fig. 2).

5.3.3 According to Minimum Breaking LQad inBending

For each category of sheet the minimum breaking loadrequirement shall be as given in Table 1. ‘

5.4 Characteristics

5.4.1 Dimensions

Within the provisions of this standard, the nominaldimensions shall be declared by the manufacturer.

?-/

Standard dimensions for corrugated sheet shallinclude length, overall width, effective nominalthickness of sheet, and depth and pitch of corrugations.The profile and other dimensions shall be tested inaccordance with Annex B.

5.4.1.1 Width

The width shall be the arithmetic average of Wl, W2and Wj as shown in Fig. 3.

5.4.1.2 Thickness

Each individual thickness measured according to B-3shall not be less than the values given in Table 1.

5.4.1.3 Number of corrugations

The number of corrugations to be considered fordesignation shall be the number of completecorrugations of the sheet.

---Lf

e-L

-hTYPE-A

e,

?

e,

LT el > e2

TYPE-B

FIG. 2 PROFILESWITHCONSTANTANDVARYINGTHICKNESS

3

IS 14871:2000

A Al

Wz?Z

d,,~ ~,+-, CAL,PE,,LC)CKCOAN;/AOL

FIG.3 ARRANGEMENTFORMEASUREMENTOFLENGTHANDWIDTH OFSHEET

5.4.1.4 Tolerances on dimensions

Following tolerances shall apply to nominal

5.4.2 Mechanical Characteristics

NOTE— For non-roofing and cladding applications, alternativemechanical characteristics may be agreed between themanufacturer and the purchaser.

5.4.2.1 Breaking load

When tested in accordance with Annex C, sheet shallhave a breaking load at least equal to the requirementsspecified in Table 1.

5.4.2.2 Defection

When tested in accordance with Annex C, the increasein deflectionfi, between applying 20 percent ~0,2) and70 percent V0,7)of the load specifying the class shallnot exceed the conventional value, f given by thefoilowing equation :

f = O.7X1O-3X+

J = fo.7 -fo.2

5.4.3 Physical Characteristics

With the exception of 5.4.3.3, these characteristicsshall be determined on products as-delivered whereverpractical. The results are identified as applying tocoated or uncoated materials. Failure of the coatingdoes not constitute failure of the product.

5.4.3.1 Impermeability

When tested in accordance with Annex D, traces ofmoisture may appear on the under face of the sheet butin no instance shall there be any formation of waterdrops during 24 h of the test.

5.4.3.2 Frost resistance

Sheets for frost resistant application, shall be tested inaccordance with Annex D. The sheets shall then be

dimensions given by the manufacturer:

a)

b)

c)d)

e)

f)

g)

Tolerance on pitch, a :a<vsmm +4.0

-2.0 ‘m75mm<a S180mm +6.0

-2.0 ‘m180mm<a S260 mm +8.0

-3.0mm260 mm< a +9.0

-3.0mm

Tolerance for pitch of corrugation relatesmeasurement over extreme corrugation.Tolerance on height of corrugation, h :15mm ShS45mm *2mm

45mm ShS150mm +3-5mm

Tolerances on length * 10 mm

to

Tolerances on overall Width and effective width,

we + 10.5 mm

Tolerance on nominal thickness, e: t 10 per-cent but not more than 10.6 mm of the nominalthickness.Out of squareness of sheets: less than 10 mm.Tolerance on height of edges: The producershall specify this tolerance in their literaturewhen it is necessary to ensure the weather

tightness of the roof, only for sheets having anascending edge one side and a descending edgeon the other side.

4

examined for any visible cracks, delamination or otherdefects in the sheets, which shall not be of a degree asto affect their performance in use.

5.4.3.3 Apparent density

The manufacturer shall indicate the nominal value ofthe apparent density of the sheets.

When measured in accordance with Annex D, thesheets shall have an apparent density equal to thisvalue with a tolerance of ~10 percent.

5.4.3.4 Warm water

When tested in accordance with Annex D, any visiblecracks, delamination or other defects in the sheets shallnot be of a degree as to affect their performance in use.

The specimens shall exhibit a ratio L. m definedin D-4.4 not less than 0.70. This is equivalent to adecrease in load of not more than 15 percent when thecoefficient of variation is 15 percent.

5.4.3.5 Heat-Rain

When tested in accordance with Annex D. Any visiblecracks, delamination or other defects in the sheets shallnot be of a degree as to affect their performance in use.

5.5 Tests

5.5.1 Acceptance Tests

The following acceptance tests shall be carried out atthe manufacturers works on sheets as-delivered, thematurity of which is guaranteed by the manufacturer.Sampling levels and acceptance criteria shall be asdefined in 8.

5.5.1.1 Compulsory tests

a) Dimensions (Annex B), and

b) Mechanical characteristics : breaking load(Annex C).

5.5.L2 Optional tests (at purchaser’s request)

Apparent density (Annex D).

5.5.2 Type Tests

These type tests should be repeated every five yearsandlor whenever required in accordance with 3.2.These tests shall be:

a) Mechanical characteristics : deflection(Annex C),

b) Impermeability (Annex D),

c) Frost resistance (Annex D),

d) Warm water (Annex D), and

e) Heat-Rain (Annex D).

Frost resistance, warm water and heat-rain tests areoptional tests as per the requirements of the purchaser.

IS 14871:2000

6 FITTINGS

6.1 Composition

The fittings shall be of composition similar to thesheets.

6.2 General Appearance and Finish

Fittings are components with particular shapes whichare fitted to profiled sheets and complete the roofingat the verge, ridge and eaves or perform functions suchas ventilation, daylight-admission, etc.

Fittings shall have straight and clean edges. They mayhave lapping joints. They may be left in their naturalcolour or colouring matter may be added in thecomposition. They may also receive adherent colouredor uncolored coatings on their surface.

6.3 Characteristics

6.3.1 Dimensions

The fittings shall have dimensions and tolerancesappropriate for use with their corresponding sheets.

6.3.2 Physical Characteristics

6.3.2.1 Frost resistance (type characteristics)

This test shall be carried out for the fittings to be usedwith sheets meant for frost resistant applications.

When tested as specified in 6.3.2.2 (optional test), anyvisible cracks, delamination or other defects in thefittings should not be of a degree as to affect theirperformance in use.

These characteristics shall be determined on productsas-delivered wherever practical. The results areidentified as applying to coated or uncoated materials.

Failure of the coating does not constitute failure of theproduct.

63.2.2 Frost resistance test

The specimens shall be cut from complete fittings andshall be approximate y 200 mm by 200 mm. Theapparatus shall be the same as for the sheets.

Submit five specimens cut from different fittings to thesame freeze/thaw cycle as for the sheets. After thecycles are completed, examine them with the nakedeye for cracks, delamination or other defects andrecord any observations. The result complies with thisstandard if the observations are in accordance with therequirements given in 6.3.2.1.

7 MARKING

7.1 Each sheet/ fitting shall be indelibly stamped ormarked by any suitable method, with the followinginformation:

5

IS 14871:2000

a)

b)

c)

d)

e)

Identification of the source of the manufac-ture

Date of manufacture;

Type, Category and Class of sheet;

Size and thickness of sheet; and

The words ‘FROST RESISTANT’ on thesheets/fittings suitable for frost resistant ap-plications.

7.2 BIS Certifkation Marking

Each sheet/fitting may also be marked with theStandard Mark.

7.2.1 ne use of Standard Mark is governed by theprovisions of the Bureau of Indian Standards Act,1986 and the Rules and Regulations made thereunder.The details of conditions under which a licence for theuse of Standard Mark maybe granted to manufacturersor producers may be obtained from the Bureau ofIndian Standards.

8 SAMPLING AND ACCEPTANCE CRITERIA

8.1 Scale of Sampling

8.1.1 La

In any consignment all the sheets of same size, type,category and class and of the same thickness andmanufactured under similar conditions of productionshall be grouped together to constitute a lot.

8.1.2 The number of sheets to be selected at randomfrom the lot shall be in accordance with Table 2.

8.2” Inspection by Variables

The inspection shall be canried out, on one sample, thesize of which is given in COI (2) of Table 2, inaccordance with 8.2.1 to 8.2.7.

8.2.1 Divide the readings in the order in which theyhave been recorded into groups of 5, except when thesample size is 7, in which case the group size is thesame as the sample size.

8.2.2 For each group, compute the range R.

8.2.3 ~rom the group ranges R compute the averagerange R.

8.2.4 Compute the sample mean ~ by dividing thesum of the measurements by the sample size.

8.2.5 Obtain from COI (3) of Table 2 thecoefficient k.

8.2.6 Compute the acceptability limit AL anddetermine the acceptability of the lot by means ofTable 3.

8.2.7 The conformity of the lot to the requirement ofthis standard shall be obtained on the basis of the testson the sheets selected from it.

Table 2 Sample Size and Acceptance Coefficient(Clauses 8.1.2,8.2 and 8.2.5)

Si of the Lot(1)

<150151to 180181to500501 to 12001201t032003201 to10000

Sample Sin(2)

33457

10

Acceptance Coefficient(3)

0.5020,5020.4500.4310.4050.507

Table 3 Acceptance Criteria for Inspection byVariables

(Clause 8.2.6)

Lindt Prescribed in AL Acceptance, Rejection,Relevant Standard If If

Lowerspecified limit, LI ~ + k~ Y2L F <AL

Upperspecifiedlimit, & l..+ k~ ~<AL Z >AL

9 INSPECTION AND MANUFACTURERSTEST CERTIFICATE

9.1 The purchaser or his representative shall haveaccess at all reasonable times to the manufacturer’sstock area for the purpose of inspecting the materialsand products and selecting and testing the sheets,which shall be so conducted as not to interfereunnecessarily with the Ioading in the carriers.

9.2 The manufacturer shall, upon request, furnish thepurchaser or his representative with the certificate thatthe finished product comply with the standard in allrespects.

10 SAFETY RULES

a) Product Identification — Sheets shall bemarked with indelible characters to show thatthey do not contain asbestos.

b) Information to Users — The manufacturershould, through its distribution system, supplyadequate information to the users concerningsafety precautions to be taken during handlingor machining of products, like excessive ex-posure to dust by cutting, drilling, sanding andturning or similar operations should beavoided by one or several of the followingmeans:

1) using low speed power tools,

2) wetting the product,

3) using personal protective equipment,(respirators), and

4) use of hand-tools.

6

ANNEX A

(Clause 2)

LIST OF REFERRED INDIAN STANDARDS

IS No.

269:1989..

455:1989

459:1992

1489 (Part 1)1991

Title IS No.

Specification for ordinary Portland 1489 (Part 2):cement, 33 grade (fourfh revision) 1991Specification for Portland slagcement ~ourfh revision) 3812:1981Specification for corrugated andsemi-corrugated asbestos cementsheets (third revision) 8041:1990Specification for Portland poz-zolana cemenc Part 1 Fly ash based 8112:1989(third revision)

12269:1987

ANNEX B

Title

Specification for Portland poz-zolana cement: Part 2 Calcined claybased (/bird revision)Specification for fly ash for use aspozzolana and admixture @r.${revision)Specification for rapid hardeningPortland cement (second revision)Specification for 43 grade ordinaryPortland cement (@w revision)Specification for 53 grade ordinaryPortland cement

(Clauses 5.4.1,5 .4.1.2 and5.5.l.1)

METHOD FOR TESTING PROFILE AND OTHER DIMENSIONS

B-1 CHECKING PROFILE

B-1.l Preparation of Specimen

The specimen shall be a complete sheet as-deliveredwithout conditioning.

B-1.2 Apparatus

B-1.2.1 Smooth Flat Surface—with dimensionsappropriate to the dimensions of the sheets.

B-1.2.2 Ruler—graduated in mm.

B-1.2.3 Micrometer—with hemispherical headaccurate to 0.1 mm,

B-1.3 Procedure

Lay the sheet flat and square on the flat surface inaccordance with Fig. 3, ensuring that the valley ofevery corrugations is in contact with it.

B-1.3.1 Measurement of Distance Between ExtremeComplete Corrugation Pitch, a

The total length over extreme complete corrugationpitch shall be measured (see Fig. 4).

Any other measurement methods with an accuracyequal or higher maybe used.

B-1.3.2 Measurement of Corrugation Height, h

Choose three complete corrugations on a sheet. Oneach of them, with the micrometer, take threemeasurements to the nearest 0.1 mm regularly spaceddown the length of the sheet in accordance withFig. 5.

Any other measurement method with an accuracyequal or higher may be used.

B-1.4 Expression and Interpretation of Results

B-1.4.1 Pitch

The total length measured over extreme corrugationshall not vary from the tolerance given in 5.4.1.4 (a).

B-1.4.2 Corrugation Height

Each result is the arithmetical average of the threemeasurements on each corrugation, expressed in mm,to the nearest 1 mm and shall be within the tolerancegiven in 5.4.1.4 (b).

B-2 MEASUREMENT OF LENGTH ANDWIDTH

B-2.1 Preparation of Specimen


B-2.2 Apparatus

B-2.2.1 Smooth Flat Surface—w ith dimensionsappropriate to the dimensions of the sheet.

B-2.2.2 Ruler — graduated in mm.

B-2.2.3 Two Rectangular Caliper Blocks

B-2.3 Procedure

Lay the sheet flat on the surface in accordance withFig. 3, ensuring that the valley of every corrugation isin contact with it.

7

IS 14871:2000

To measure the length, take three measurements, onein the middle and at two points approximately 50 mmfrom each side or further to avoid mitered corners (seeFig. 3).

To measure the overall width, take threemeasurements, one in the middle and at two pointsapproximately 50 mm from each side or further toavoid mitered comers (see Fig. 3).

To measure the effective width, take two sheets andplace one over the other, such that the down lap of onesheet is in lap with the uplap of the other sheet. Taketwo measurements at both the edges, as shown inFig. 4.


Read each measurement to the nearest 1mm, calculatethe arithmetic average of the length, width andcompare them with the requirements given in 5.4.1.4(c) and 5.4.1.4 (d) respectively.

The results are considered satisfactory if they conformto the requirements.

B-3 THICKNESS CHECK



r DISTANCE BEJ%EWEJSEXTREME

1~~FIG. 4 ARRANGEMENTFORMEASUREMENTOFDISTANCEBETWEENEXTREMECOMPLETECORRUGATIONPITCH,ETC

(a) CORRUGATED SHEETS

1II

(b) ASYMMETRICAL SHEETS

FIG.5 ARRANGEMENTFORMEASUREMENTOFCORRUGATIONHEIGHTOFSHEETS

8

IS 14871:2000

B-3.2 Apparatus

B-3.2.1 Micrometer withhemicylindrical plates asinFig. 6, accurate to 0.05 mm.

R2

lo A

L,+’’w’Q

All dimensionsinmillimetres.

FIG. 6

B-3.3 Procedure

Make the measurements approximately 15mm fromthe end,

a) in the valley and at the crown of the corruga-tion for sheets of Type A, and

b) on the crown and on the flank of the corruga-tions for sheets of Type B.

Measure the thickness at 6 points (3 crowns and3 valleys for Type A, 3 crowns and 3 flanks for Type B).


The results are the individual measurements and theaverage of all measurements, expressed in mm, whichshall be compared with the requirement given in5.4.1.2 and 5.4.l.4(e).

The results are considered to be satisfactory if theyconform to the requirements.

B-4 SQUARENESS CHECK


The specimen shall be a complete sheet as deliveredwithout conditioning.

B-4.2 Apparatus

B-4.2.1 A smooth flat surface with dimensionsappropriate to the dimensions of the sheet.

B-4.2.2 A rectangular frame with two corrugatedends and two straight sides or any other appropriatedevice to check the squareness of ends with respect tocorrugations with an accuracy of 1 mm.

B-4.2.3 A graduated metal ruler reading to 0.5 mm.

B-4.3 Procedure

Lay the sheet on the flat surface ensuring that thevalley of every corrugation is in contact with it.

Measure the out of squareness at each end, as indicatedin Fig. 7 as an example.


The results in mm shall be compared with therequirements given in 5.4.l.4(f). The results areconsidered to be satisfactory, if they conform to therequirement.

B-5 HEIGHT OF EDGES


The specimen shall be a complete sheet as deliveredwithout conditioning.

B-5.2 Apparatus

B-5.2.1 A smooth flat surface with dimensionappropriate to the dimension of the sheet.

B-5.2.2 Two appropriate measurement devices, onedevice for the ascending corrugation (hOm)and onedevice for the descending corrugation (hOd).

B-5.3 Procedure

Lay the sheet flat on the surface ensuring that thevalley of the every corrugation is in contact with it.Measure the height of both edges as in Fig. 8 with thedevice with an accuracy of lmm.


The results at any point on the edges of the sheets,expressed in mm, shall be compared with therequirements given in 5.4.1.4 (g).

The results are considered to be satisfactory, if theyconform with’the requirements.

9

IS 14871:2000

FIG. 7 ARRANGEMENTFORCHECKINGOUT-OF-SQUARENESS

FIG. 8 ARRANGEMENTFORMEASURINGHEIGHTOFEOGES

ANNEX C

(Clauses 5.4.2.1,5.4.2.2,5.5.1.1, D-4.2.2 and D-4.3)

METHOD FOR BREAKING LOAD TEST

C-1 BREAKING LOAD TEST

C-1.l Preparation of Specimen

The test specimen shall be a complete sheet, or atransversally cut sheet with a minimum length of1.2 m. The manufacturer shall guarantee its maturity.

C-1.2 Apparatus

C-1.2.1 Bending Test Machine—with a constant rateof deflection when applying the load and with an errorof exactitude and an error of reproducibility less thanor equal to 3 percent. Where this facility is notavai~able, a constant rate of loadhg is acceptable.

This machine comprises:

a) Two parallel supports (one freed) in the samehorizontal plane atid longer than the samplewidth. The upper surface of each support shallbeflat and 50 mm in width. The distance betweenthe supports shall be a clear span of 1.1 m.

For sheets with a corrugation height greaterthan 80 mm, the span shall be increased to atleast 15 times the height of the corrugations

10

b)

c)

and breaking load adjusted by the ratio of thisspan to a span of 1.lm for comparison with therequirements of Table 1.

For sheets shorter than 1.2 m, the span shall bereduced without going below 15 times theheight of the cotntgations or 700 mm, and thebreaking load adjusted by the ratio of this spanto a span of 1.1 m for comparison with therequirements of Table 1.

A flat loading beam 230 mm wide locatedparal-lel to and equidistant from the supports, attachedto the mechanism by means of a flexible joint.

Three strips of felt or soft materialapproximately 10 mm thick, with lengthand width equal to the supports and loadingbeam.

NOTE — In case lower span other than recommendedis used for testing (however, the span should not be lessthan 15 times the height of corrugation) the breakingload obtained thus shall be adjusted to the ratio of [hisspan to a span of 1.i m for comparison with therequirements of Table 4.

I

Before testing, immerse the specimen in water at anambient temperature. Testing shall be carried out afterwet conditioning. Condition specimens in accordancewith Table 4.

Table 4 Conditioning(Clauses C-1.2. 1 and C-1.3)

IS 14871:2000

Measure the deflection at midspan under 20 percentand 70 percent of the load which specifies the class.

C-4 EXPRESSION AND INTERPRETATIONOF RESULTS

The breaking load per meter width, expressed in N/m,is given by the formula:

Test ConrMioningProcedure(1) (2)

Acceptance test 24 h immersion in water

Type test Prior to bending test 7 days at ambientlaboratory conditions followed by 24 himmersion in water

The specimen is placed on the supports (the smoothface in compression) at right angles with thecorrugations and loaded at midspan by the flat beamevenly distributing the load applied to its ,centre, afterinterposition of the strips of felt or soft material.

The breaking load (see 3.6) or sag with maximum loadshall occur between 10s and 45 s after the beginningof loading.

PC==;

When a span 1other than 1.1 m is used, the breakingload, PCper metre width for comparison with Table 1is given as

1Pc=; xfi

The deflection at 20 percent and 70 percent of the loadwhich specifies the category shall be expressed in mmand their difference calculated. Breaking load shall becompared to the requirements given in 5.4.2.1 andTable 1 and the deflection can be comparedwith 5.4.2.2. The results are considered to besatisfactory if they conform to the requirements.

ANNEX D

(Clauses 5.4.3.1,5.4.3.2,5.4.3.3, 5.4.3 .4,5.4.3.5 and 5.5.1.2)

METHOD FOR TESTING IMPERMEABILITY, FROST RESISTANCE, APPARENT DENSITY,IN WARM WATER AND AGAINST HEAT-RAIN

D-1 IMPERMEABILITY

D-1.l Preparation of Specimen

The test shall be made on three whole sheetsas-delivered or cut sheets with a minimum length of1.2 m. The sheets shall be kept for 7 days in alaboratory atmosphere at an ambient condition.

D-1.2 Apparatus

D-1.2.1 Frame

The width of frame depends on the profile of the sheetsand wherever possible more than 500 mm; thedimensions are shown in Fig. 9.

D-1.3 Procedure

Seal the frame on the sheet. Then fill the frame withwater until the level is approximately 20 mm above thetop of the corrugations. Examine the underface after24 h.

D-1.4 Expression and Interpretation of Results

The result shall be assessed visually by comparisonwith the requirements given in of 5.4.3.1.

D-2 FROST RESISTANCE

D-2.1 Preparation of Specimens

The test shall be performed on five specimens cut onefrom each of five sheets. These specimens shall havethe following dimensions:

a) 300 mm in the direction of the corrugations, and

b) 200 mm perpendicular to the corrugations.

D-2.2 Apparatus

D-2.2.1 Freezer— having a forced air circulation andcapable of being regulated to the prescribed freezingconditions with a full load of test specimens.

D-2.2.2 Thawing Equipment — conforming to theprescribed thawing conditions.

D-2.2.3 Water bath—filled with water at ambienttemperature.

D-2.3 Procedure

Immerse the specimens in water at an ambienttemperature for 24 h intervals until the differencebetween two consecutive weighings is less than 0.5percent.

Then subject the specimens to freeze/thaw cyclesconsisting of:

a)

11

IS 14871:2000

/+-’1

All dimensions in millimetres.

Categwy c

Shallow corrugations 6 conjugationsMedium corrugations 4 corrugationsDeep corrugations 3 corrugationsVary deep corrugations 2 corrugations

FIG.9 ARRANGEMENTFORTESTINGIMPERMEABILITY

Then subject the specimens to freeze/thaw cyclesconsisting of

a) cooling in air to reach -20°C t 2°C within 1h to 2 h, and holding at this temperature for lh.

b) thawing in water at ambient temperaturewithin 1h to 2h, and holding in this conditionfor lh. Then recommence freezing.

During both freezing and thawing, the specimens shallbe positioned to enable free circulation of theconducting medium (air or water) around each.Freeze/thaw cycles may be controlled automaticallyor manually. Continuous automatic cycling isprefemed. Manual supervision of freeze/thaw cyclesshall record the completion of each cycle. Eachfreeze/thaw cycle shall take between 4 h and 6 h intotal. An interval between cycles (72 h maximum) ispermissible. During this interval specimens shall bestored at ambient condition.

NOTE —The temperature specified above refers to the freezingcavity.

The total number of freeze/thaw cycles shall be 50.

D-2.4 Expression and Interpretation of ResuMs

The result shall be assessed visually by comparisonwith the requirements given in 5.4.3.2. The result isconsidered to be satisfactory if it conforms to therequirements.

D-3 APPARENT DENSITY

D-3.1 Preparation of Specimen

A test specimen of size of approximately 40 mm x

60 mm shall be cut from the uncoated sheet.

D-3.2 Apparatus

D-3.2.1 Ventilated Oven — capable of achieving atemperature of 100 “C to 105 “C with full load ofspecimens.

D-3.2.2 Weighing Scale — accurate to within ~ 0.1percent and equipped to determine the immersed andnon-immersed masses of the specimens.

D-3.3 Procedure

Determine the volume, V by immersion in water oranother method having an accuracy equal or higher. Incase of immersion, the test specimens shall besaturated in water beforehand.

Determine the mass, m, of the specimen after drying itin the ventilated oven maintained at 100 ‘C to 105 “Cfor 24* lh.


The apparent density is given by the formula:

~=;

12

IS 14871:2000

LINE OF CUTTING

~

L CORRUG/.T~~N VALLEYJ

~ LINE OF CUTTING=

.

VALLEY AXES

FIG. 10 ARRANGEMENTFORWARMWATERTEST

It shall be compared with the requirements givenin 5.4.3.3.

The result is considered to be satisfactory if itconforms to the requirements.

D-4 WARM WATER

This test investigates the possible degradation of theproducts by keeping them in warm water for aprotracted period.

D-4.1 Preparation of Specimens

Cut 20 specimens longitudinally from the middle of acomplete sheet, with two complete corrugations if thesheet is not wide enough on a complete corrugation.Longitudinal cutting shall be done in the axis of thevalley as indicated in Fig. 10, allowing a little beyondthis axis. Specimens may be transversally cut to alength allowing a free span of 15 times the height ofcorrugations.

D-4.2 Apparatus

D-4.2.1 Water Bath — capable of temperature controlto 60 ‘C t 2 ‘C.

D-4.2.2 Bending Test Machine — as specified inAnnex C.

D-4.3 Procedure

Divide the specimens at random into two lots of 10.Submit one lot of 10 specimens to the breaking loadtest according to Annex C and, at the same time,immerse the second lot of 10 specimens in water at60”C * 2°C for 56 days f 2 days. The pieces ofproducts used for saturation shall be broken down to asize and be of sufficient quantity to ensure thatsaturation is complete.

At the end of this period, place the second lot ofspecimens in a laboratory atmosphere for 7 days.Examine the specimens with the naked eye in order todetect any cracks or obvious defects such as mightaffect their performance in use and record anyobservations. Then carry out the breaking load test asspecified in Annex C including preliminaryconditioning as given in Annex C.


For each of the two lots, calculate the mean breakingload taking for W the average of two measurements ofthe width of the specimens and the standard deviationof the values obtained.

Let Ml and S1be the mean and the standard deviationof the results obtained on the first lot, and M2 and S2be the mean and the standard deviation of the resultsobtained on the second lot tested after immersion inwater.

Calculate the lower estimation of the mean breakingload after immersion in warm water at 95 percentconfidence level as:

L,= M2 –0.58 S2

and the upper estimation of the mean breaking loadat 95 percent confidence level of the reference lot as:

Li = Ml + 0.58 S1

Calculate the 95 percent lower confidence limit asfollows :

L=;s

The visual observations and the results L shall becompared with the requirements of 5.4.3.4. Theresults are considered to be satisfactory if theyconform to the requirements.

13

IS 14871:2000

D-5 HEAT-RAIN simulated overlaps at the four edges. Submit the sheets

D-5.1 Preparation of Specimens to 25 cycles as described in Table 5.

The test shall be carried out on 9 full size sheets. After 25 cycles, inspect the sheets for cracking

D-5.2 Apparatus (longitudinal, transverse and at the fixing points),delamination, or other visual defects.

D-5.2.1 Suitable Frame

Inclined at 25 * 5°, placed in a space without draughtbut conveniently ventilated.

D-5.2.2 A heating device calibrated in order tomaintain a blackbodyl) surface temperature of70 ~ 5 “Con the surface at the crown of corrugations.It should provide an approximately uniform poweroutput during the whole heating period.

D-5.2.3 A water sprinkling device with an output ofapproximately 2.5 l/rein per square metre of platesurface, delivering water at an ambient temperature.


The result of the visual assessment shall conform torequirements given in 5.4.3.5.

The result is considered to be satisfactory if itconforms to the requirements.

Table 5 Heat-Rain Cycle(Clause D-5.3)

Operotion Duration(1) (2)

D-5.3 Procedure Wetting (2.5 l/min/m2) 2 h 50 min

Submit the test specimens to preliminary conditioning lme~~ 10min

by storage to equilibrium for 7 days in a laboratory t-Ieatingi’o* 5 ‘c 2h50min

atmosphere with suitable aeration, with the specimens Intervat 10 min

fixed on the frame according to the manufacturer’s TOCII 6h

laying instructions. Lay each sheet with actual or

I)For ~hl~test an ~luminium plate of lmm thickness @n@d with a

mattblack paint is u%d as a blackbody. The measurement device isa thermocouple or a similar device fixed behind the aluminium plate.

14

Is 14871:2000

ANNEX E

(Foreword)

COMMITTEE COMPOSITION

Cement Matrix Products Sectional Committee, CED 53

ChairmanSHRIS. A. REDDI

MembersSHRIP, S. KALANI

SHRIN. KISHANREDDY (Alternate)SHRIG. R. BHARITKAR

COLD. V. PADSALGIKAR(Alternate)DRB. K. RAO

DR S. K. AGARWAL(Alternate)SHR1P. SUBRAMANIAN

SHRIK. P. ABRAHAM(Aherwafe)SHRIS. M. MUNJAL

SHRIR. K. AGARWAL(Alternate)SHRIMAHENDRAPRASAD

SHRIA. K. AGGARWAL(Alternate)SHRIK. SRIVASTAVASHRIS. P. RASTC61SHRIA. K. CHADHA

SHRIJ. R. SIL(Altema/e)SFIRIV. SURW

SHRIS. K. TANWA(Affemafe)SHRIK. H. GANGWAL

SHKIV. PATTABHI(Aftemare)SHRIO. P. A~ARWAL

SHRIJ.L. DHINGRA(Akernu)CHIEFENGINEER(CEMENTCONCRETEROAD)

DEPUTYCHIEFENGINEER(PURCHASE)(Alrernafe)DR C. RAJKUMAR

SHRIH. K. JULKA(Alternate)SHRID. K. KANUNGO

SHRIT. CHOUDHURY(Ahemate)JOINTDIRIXJ’ORSTANDARDS(B&S)

ASS’ITDESIGNENGINER(Ahemate)SHRIM. A. AZEEZ

SHRIP. D. GAIKWAD(Alternate)SHRIN. P. RAJAMANE

DR M. NEELAMEOAM(Alternate)SHRIC. H. SUBRAMANIAN

SHRIA. DUITA (Aftemate)SHRIC. Y. GAVHANE

SHRID. N. JOSHI(Aftemate)SHRIS. HARIRAMASAMYSHRIB. V. B. PAI

SHRIM. S. DANDWATE(Ahemate)SHRIP. D. KELKAR

SHRIP. R. C. NAIR(Altema/e)SHRIS. S. SETHL

Director (Civ Engg)

RepresentingGammon India Ltd, Mumbai

All India Small Scale AC pressure P@e Manufacturers’ Association,Secunderabad

B.G. Shirke Construction Technology Ltd, Pune

Central Building Research Institute, Rmmkee

Central Public Works Department, New Delhi

Directorate General of Supplies& Disposals, New Delhi

Engineer-in-Chief’s Branch, Army Headquarters, New Delhi

Etemit Everest Ltd, New DelhiFederation of UP PipeManufacturers, LucknowHindustan Prefab Ltd, New Delhi

Housing and Urban Development Corporation, New DelKI

Hyderabad Industries Ltd, Hyderabad

Municipal Corporation of Delhi, Delhi

Municipal Corporation of Greater Mumbai, Mumbai

National Council for Cement and Building Materials, BaBabgarh

National Test House. Calcutta

Research, Designs and Standards Organization (Ministry of Railways)Lucknow

Rural Electrification Corporation Ltd, New Delhi

Structural Engineering Research Centre (CSIR), Chennai

Small Scale Industries Services Institute, Ministry of Commerce andIndustry, New Delhi

Spun Pipes Manufacturer’s Association of Maharashtra, Pune

Tamil Nadu Water Supply& Drainage Board, ChennaiThe Associated Cement Companies Ltd, Thane

TheIndian Hume Pipe Co Ltd, Mumbai

Dkector General, BIS (E@Jcio Member)

Member-SecretarySHRISANJAYPANT

Deputy Director (Civ Engg), BIS

15

IS 14871:2000

(CmrJinuedJrom page 15)

ConvenerDRC. RAJKUMAR

MembersSHRIP.S. KALANJ

Fibre Reinforced Cement Products Subcommittee, CED 53:1

SHRIN. KISHANREDDY(Alternate)DRB. K. RAO

DR S. K. AGARWAL(Alternate)SHR[S.B. SURI

SHRIN. CHANDRASEKARAN(Alternrxe)SUPERINTENDINGENGINEER(TADC)ENGINEER-INCHIEF(WATER)SHRIN. S. BASU

SHRIT. N. OBOWLIA(Alternate)SHRIN. G. BASAK

SHRIP. K. JAIN(Afremore)COLV. K. P. SINGH

MAJ R. S. PHANWALA(Alternate)DR N. BALASUERAMANIAN

SHRIK. K. MALIK(Afternafe)SHRIJ. S. SANGANERIA

SHRIV. K. KASLIWAL(Alternate)SHRIA. K. CHATURVEDJ

SHRIS. M. LALWANI(Alternate)SHRIV. PATTABHI

SHRIA. K. GUPTA(Alternate)SHRIP. L. JAIN

SHRIM. M. JAJN(Alternate)DRP. S. KALANI

SHRIT. S. SUMMI(Alfemare)SHRJRAJKUMAR

SHRIS. C. KUMAR(Alter-note)DR N. K. JAJNSHRIS. K. BANERJEESHRJS. GANPATHYDEPUTYDIRECTORSTANDARDS(B&F)

Ass’m DESIGNENGINEER(B&F) (Alternate)SHRIK. P. GOENKA

SHRIL P. GOENKA(Alternate)

RepresentingNational Council for Cement and Building Materials, Ballabgarh

AllIndia Small Scale AC Pressure Pipe Manufacturers’ Association,Secunderabad

Central Building Research Institute, Roorkee

Central Soil tmd Materiats Research Station, New Delhi

Central Public Works Department, New DelhiDelhi Water Supply & Sewage D@osal Undertaking, New DelhiDirectorate General of Supplies and Dkposals, New Delhi

Director General of Technical Development, New Delhi

Engineer-in-Chiefs Branch, Army Headquarters, New Delhi

Etemit Everest Ltd. New Delhi

Geological Survey of lndla, Catcutta

Gujarat Compsite Ltd, Ahmedabad

Hyderabad Industries Ltd, Hyderabrrd

Jain Trading Corporation, Kota

Kalani Asbestos Cement Private Ltd, Indore

Ministry of Industry (SS1),New Delhi

National Council for Cement and Building Matreials, BallabgarhNational Test House, CalcuttaRamco Industries Ltd, ChennaiResearch, Designs & Standards Organization (Ministry of Railways),

Lucknow

Sarbamangata Industries, Calcutta

16

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote

harmonious development of the activities of standardization, marking and quality certification of goods

and attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards .

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Doc : No. CED 53( 5784).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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