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IS 5454 (1978): Methods of sampling of clay building bricks

[CED 30: Clay and Stabilized Soil Products for

Construction]

Indian Standard

IS : 5454 -1918

~Ii/lfll 2010

Gr 2

METHODS FOR SAMPLING OFCLAY BUILDING BRICKS ~

( First Revision)

Fourth Reprint NOVEMBER 2005

UDC 691.421: 620 .113

© Copyright 1979

BUR E A U OF I N D I A N STAN DAR D SMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

February 1979

IS : S454 • 1978

Indian Standard

METHODS FOR SAMPLING OF

CLAY BUILDING BRICKS

( First Revision)

Building Materials and Components SamplingSectional Committee, DDC 31

Chairman

SHRI G. D. JOOLEKAR

Telegaon ( Dist Pune )

Members

SHRI J. S. BEDI

Representing

Doors, Windows and Shutters Sectional Committee,BDC 11, lSI

SHRI KARAMJlT SINOH

SHRI K. K. KHANNA

SHRI A. C. MANNAN ( Alternate)DR T. KRISHNAN Indian Statistical Institute, CalcuttaSRRI S. R. KSHIRSAOAR Sanitary Appliances and Water Fittings Sectional

Committee, BDC 3, lSISHRI R. P. MISHRA ( Alternate)

SHRt N. C. MAJUMDAR Clay Products for Building Sectional Committee,DOC 30, lSI

SHRI A. K. SoBTI ( Altemate )SHRI B. B. BHATIACHARJBE Concrete Reinforcement Sectional Committee,

BSMDC 8, lSISHRI T. SEN ( Alternate)

SHRI J. D. DARooA Italab Engineering Pvt Ltd, BombaySHRI N. R. PATRAWALA ( Alternate)

SHRI K. H. GANDHI Directorate General of Inspection (' Ministry ofDefence), New Delhi

SHRI SAT PAL SINOH ( Alternate )SHRI S. K. OURNANI Railway Board ( Ministry of Railways)

SHRl M. S. BKBOTB ( Alternate) .SHRI P. J. JAOUS Pozzolanas Sectional Committee, BDC 16, lSI

SHRI M. R. VINAYAKA ( Alternate)SHRI K. P. JAIN Builder's Hardware Sectional Committee, BDC IS,

lSICentral Public Works Department, New DelhiConstruction Plant and Machinery Sectional Com­

mittee, DDC 28. lSI

( Continued on page 2 )

C Copyright 1979

BUIlEAU OF INDIAN STANDARDS

This publication i. protected under the Indian Copyri,ht Act ( XIV of 19.57) andreproduction in whole or in part by any means except with written permission ofthe publisher shall be deemed to be an lofrin,emont of copyriaht under the .said Act ..

M.mb~r$

SHRI M. R. MALYA

IS : 54S4 • 1978

(Contlnu~d from p a l ~ 1 )

Representing

Bitumen and Tar Products Sectional Committee,-OCDC 2, lSI

SHRI S. K. DUTrA ( Alternate)CoL Y. P. MISRA Wool Products Sectional Committee, DDC 20, lSIDR MOHAN RAJ Central Building Research Institute (CSIR),

RoorkeeSHRI R. K. OOEL ( Alternate )

DR A. K. MULLICIt Cement Research Institute of India, New DelhiDR M. P,.NCHOLY Sieves Sectional Committee, DOC 19, lSISHRI S. S. RAJPt)T Forest Research Institute and Colleges, DehraDunSHRI E. K. RAMACHANDRAN National Test House, Calcutta

LALA G. C. DAS ( AII~,nQtt )SHRI N. MOHAN RAO Research & Development Organization ( Ministry

; of Defence ), New DelhiSHRI Y. B. OHORPADE ( Alternate)

SURI A. C. SEKHAR Timber Sectional Committee, DOC 9, lSISHRJ C. A. TANEJA Gypsum Building'Materials Sectional Committee,

DOC 21, lSI T

DR B. N. SINOH, Director General, lSI ( Ex-officio Memb~r )Director ( Stat )

S~C'6IQry

SRRI N. C. TYAOI

Deputy Director ( Stat ). lSI

2

AMENDMENT NO. 1 MARCH 2008TO

IS 5454 : 1978 METHODS FOR SAMPLING OF CLAY

BUILDING BRICKS

( Fint Revision)

(Page 7, clause 5.2.1.1, last line) - Substitute '15 percent' for

'20 percent'.

(CEO 30)

Reprography Unit,BIS,New Delhi, India

IS : 5454 - 1978

Indian Standard

METHODS FOR SAMPLING OF

CLAY BUILDING BRICKS

( First Revision)

n, FOREWORD

0.1 This Indian Standard (First Revision) was adopted by the IndianStandards Institution on 10 July 1978, after the draft finalized by theBuilding Materials and Components Sampling Sectional Committee hadbeen approved by the Civil Engineering Division Council.

0.1 The clay building brick is the most extensively used building material inthe construction work. Its quality is of fundamental importance in ensuringthe soundness of the buildings and structures. It is, therefore, imperativethat due consideration is given to the sampling procedures which wouldhelp in proper and objective evaluation of the quality of the bricks.

0.3 This standard was originally issued in 1969. However. in view of theexperience gained in the course of years and the introduction of new andrevised quality characteristics and methods of test in Indian Standardspertaining to various types of clay building bricks, it was felt necessary torevise this standard. In this revision, sampling procedures for breakingload, transverse strength and bulk density have been included. The criteriafor conformity for eftlorescence and compressive strength have been modi­fied to bring them in line with the latest Indian Standards on specificationsand methods of testing of clay building bricks.

0.4 In reporting the result of a test or analysis made in accordance withthis standard. if the final value, observed or calculated, is to be rounded off,it shall be done in accordance with IS: 2·1960*.

1. SCOPE

1.1 This standard lays down methods for sampling and criteria for ascer­tainioa conformity of solid, hollow and perforated burnt clay buildingbricks to the relevant specifications.

·R.ules for roundiol off numerical values( re,i,.d ).

3

IS : 5454 • 1978

2. TERMINOLOGY

1.0 Por the purpose of this standard, the following definitions shall apply.

2.1 Lot - A collection of bricks of the same class and size, manufacturedunder relatively similar conditions of production. For the purpose ofsampling, a lot shall contain a maximum of 50 000 bricks. In case aconsignment has bricks more than 50000 of the same classification and size,and manufactured under relatively similar conditions of production, it shallbe divided into lots of 50000 bricks or part thereof.

2.2 Sample - A collection of bricks selected for inspection and/or testingfrom a lot to reach the decision regarding the acceptance or rejection ofthe lot.

2.3 Defective - A brick failing to meet one or more of the specifiedrequirements.

2.4 Average - The sum of the observations divided by the number ofobservations.

3. METHODS OF SAMPLING

3.t The sample may be drawn either by: (a) random sampling, or(b) stratified sampling method in accordance with 18:4905-1968·.

3.1 The sample shall be taken by one of the methods given in 3.2.1, 3.2.1or 3.1.3 so as to yield the number of bricks required.

3.2.1 Sampling in Motion - Whenever practicable the sample shall betaken while the bricks are being moved, for example, during loading orunloading. The lot shall be divided into a number of convenient portions(not less than ten). Approximately equal number of bricks shall be drawnfrom each of these portions at regular intervals, such that the requisitenumber of bricks for inspection and testing is provided.

3.1.1 Sampling from a Stack - When it is necessary to take a samplefrom a stack, the stack shall be divided into a number of real or imaginarysections and the required number of bricks drawn from each section. Forthis purpose bricks in the upper layers of the stack shalt be removed toenable units to be sampled from places within the stack.

3.1.3 Sampling from Lorries or Trucks - When it is necessary to take asample from bricks loaded in lorries or trucks. the sample bricks shall betaken from a number of lorries/trucks (not less than ten, if possible) suchthat when equal number of bricks are drawn from each of the lorries/trucksthe number of bricks required for the inspection and testing is provided.

• Method. for random samplinl.

4

IS : 5454· 1978

4. SCALE OF SAMPLING AND CRITERIA FOR CONFORMITYFOR VISUAL AND DIMENSIONAL CHARACTERISTICS

4.1 The bricks shall be selected and inspected for each lot separately forascertaining their conformity to the requirements of the relevantspecification.

4.1.1 The number of bricks to be selected from a lot shall depend on thesize of the lot and shall be in accordance with col 1 and 2 of Table 1 forvisual characteristics in all cases and dimensional characteristics if specifiedfor individual brick. In case dimensions are specified for a group of20 bricks. the scale of sampling for dimensional characteristics shall be inaccordance with col 1 and 4 of Table I. All these bricks shall beselected following the methods detailed in 3.

4.2 Visual Cbaracteristlcs-All the bricks selected as in 4.1.1 in accordancewith col 1 and 2 of Table I shall be examined for visual characteristics. Ifthe number of defective bricks found in the sample is less than or equal tothe corresponding number as specified in col 3 of Table 1, the lot shall beconsidered as satisfying the requirements of the visual characteristics.However, if the number of defective bricks in the sample is greater than thecorresponding permissible number of defectives, the lot shall be deemed asnot having met the visual requirements.

TABLE 1 SCALE OF SAMPLING AND PERMISSIBLENUMBER OF DEFECTIVES FOR VISUAL AND

DIMENSIONAL CHARACTERISTICS

( Clauses 4.1.1, 4.2 and 4.3.2)

No. OF BRICltS POR CHARACTERlmcs SPECIFIED POR DIMENSIONAL CHAR-

IN THE LoT POR INDIVIDUAL BRICIt ACTBRJSTlCS SPECIFIED

r A , FOR Oaoup 0'No. of Bricks Permissible No. 20 BRlco-No. OF

to be Selected of Defectives 'in BRICKS TO BE

the Sample SEUCrED

(1) (2) (3) (4)

2001 to 10000 20 40

10001 to 35000 32 2 60

3S001 to 50000 SO 3 80

NOTE - In case tho lot contains 2000 or less bricks, the sampling shall be subjectto alreement between the purchaser and the supplier.

s

LOT SIZE

IS : 5454 • 1978

4.3 Dimensional Characteristics-The dimensions and tolerances have beenspecified in various standards for clay building bricks. In some standardsthe dimensions and tolerances have been specified for individual brick. Insome other standards the dimensions and tolerances have been specified fora group of 20 bricks.

4.3.1 In case the dimensions and tolerances have been specified forindividual brick, the scale of sampling and criteria for conformity shall bethe same as laid down in 4.2 for visual characteristics.

4.3.2 In case the dimensions and tolerances for bricks are specified asoverall on a group of 20 bricks, the number of bricks to be selected forinspecting the dimensions and tolerances shall be in accordance with col 1and 4 of Table 1. These bricks will be divided into groups of 20 bricks atrandom and each of the groups thus formed tested for all the dimensionsand tolerances. A lot shall be considered having found meeting the require­ments of dimensions and tolerances if none of the groups of bricks inspectedfails to meet the specified requirements.

s, SCALE OF SAMPLING AND CRITERIA FOR CONFORMITYFOR PHYSICAL CHARACTERISTICS

S.l The lot which has been found satisfactory in respect of visual anddimensional requirements (see 4.1 and 4.3) shallnext be tested for physicalcharacteristics like compressive strength, breaking load, transverse strength,bulk density, water absorption, efflorescence and warpage as specified inrelevant material specification. The bricks for this purpose shall be takenat random from those already selected in 4.1.1. The number of bricks to beselected and tested for each of these characteristics shall be in accordancewith relevant columns of 'Table 2.

TABLE 2 SCALE OF SAMPLING FOR PHYSICAL CHARACTERISTICS

( ClauJel s.r, 5.2.3 and 5.2.4 )

SAMPLE SIZB fOR COMPRSS- PERMISSIBLB No. WARPAOB

SIVB STRENGTH, BREAKINO 0' DSPECfIVES r- A 1

LoAD, TRANSVERSI SYR- FOR EPFLOR- Sample PermissibleENGTH, BULK DENSITY, BICENce Size No. of

WATER ABSOR.PTlON DefectivesAND EPFLORISCINCB

(1) (2) (3) (4) (S)

2001 to 10000 5 0 10 0

10001 to 35000 10 0 20 1

35001 to 50000 IS I 30 2

NOTB - In cue tho lot contains 2000 or lesl bricks, the ••mplinlshall.be subjectto aareemcDt between tho purchaser and the supplier.

6

IS : 5454 • 1978

5.2 A lot shall be considered having satisfied the requirements of physicalcharacteristics if the conditions stipulated in 5.2.1, 5.2.2, 5.2.3 and 5.2.4 areall satisfied.

5.2.1 From the test results for compressive strength, breaking load, andtransverse strength (whichever applicable ), the average shall be calculatedand shall satisfy the requirements specified in the relevant materialspecification.

NOTE - In case any of the test results for compressive strength exceeds the upperlimit (or the class of brick, the same shall be limited to the upper limit of the class(or the purpose of averaging.

5.2.1.1 Wherever specified in the material specification the compressivestrength of any individual brick tested in the sample shall not fall below theminimum average compressive strength specified for the corresponding classof brick by more than 20 percent.

5.2.1 From the test results for water absorption and bulk density theaverage for the bricks in the sample shall be calculated and shall satisfy therelevant requirements specified in the material specification.

5.2.3 The number of bricks failing to satisfy the requirements of theeffiorescence specified in the relevant specification shall not be more thanthe permissible number of defectives given in col 3 of Table 2.

5.1.4 The number of bricks failing to satisfy the requirements of warpagewherever specified in the relevant specifications shall not be more than thepermissible number of defectives given in col S of Table 2.

7

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