is.2720.19.1992 centrifuge moisture equivalent

8/12/2019 is.2720.19.1992 Centrifuge Moisture Equivalent

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IS 2720 Part 19 ) : 1992

I ndian St andardMETHODS OF TEST FOR SOILS

PART 19 DETERMINATION OF CENTRIFUGE MOISTURE EQUIVALENT

f Fi rst Revi si on

UDC 624 13 1.377-620-176

@ BIS 1992BURE U OF INDI N ST ND RDSMANAK BHAVAN 9 BAHADUR SHAH ZAFAR M RG

NEW DELHI 1.10002November 1992 Price Group 1

( Reaffirmed 2002 )


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Soils and Soil Engineering Sectional Committee, CED 23

FOREWORDThis Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalizedby the Soils and Soil Engineering Sectional Committee had been approved by the CivilEngineering Division Council.With a view to establish uniform procedures for determination of different characteristics of soilsand also for facilitating comparative studies of the results, an Indian Standard Methods of Testsfor Soils, IS 2720 has been published in 41 parts. This part deals with the method of test fordetermination of centrifuge moisture equivalent of soils. The value of the centrifuge moistureequivalent is useful in assessing the relative permeability of soils.This standard was first published in 1964. In this first revision apart from the general updation,the amendment issued has been incorporated and all the quantities/dimensions have been givenin SI units.For the purpose of deciding whether a particular requirement of this standard IS complied with,the final value, observed or calculated, expressing the result of a test or analysis, shall berounded off in accordance with 1s 2 : 1960 Rules for rounding off numerical values ( revised .The number of significant places retained in the rounded off value should be the same as that ofthe specified value in this standard.


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IndianMETHODS OF

IS 2720 ( art 19 ) : 1992

StandardTEST FOR SOILS

PART 19 DETERMINATION OF CENTRIFUGE MOISTURE EQUIVALENT

Fi rst Rev i si on1 SCOPEThis standard (-Part 19 ) lays down the methodfor determining the centrifuge moisture equiva-lent of soils.2 REFERENCESThe Indian Standards listed below are nece-ssary adjuncts to this standard:

IS No Title1433 : 1965 Specification for beam scales2720 Methods of test for soils :Part 1 ) : 1983 Part 1 Determination of drysoils samples for various tests( second revision3 TERMINOLOGY3.0 For the purpose of this standard, thefollowing definition shall apply.3.1 Centrifuge Moisture Equivalent ( CME )The centrifuge moisture equivalent of a soil isthe amount of moisture, expressed as a percen-tage of the mass of the oven-dried soil, retainedby the soil which has been first saturated withwater and then subjected to a force equal to1 000 times the force of gravity for one hour.4 APPARATUS

a)

b)

cl

Gooch Crucible - porcelain, with per-forated bottom. The crucible shall beabout 40 mm in height and the diametershall be about 25 mm at the top andabout 20 mm at the bottom.Filler Paper - circular piece, just largeenough to cover the inside bottom ofthe Gooch crucible. A Whatman filterpaper No. 42 or equivalent is foundsuitable.Trunnion Cup - a Babcock trunnioncup fitted with a brass cap and with asuitable device for supporting the Goochcrucible 12 mm above the bottom of thecup in such a manner that the waterejected during the centrifuging operationshall not come in contact with the cruci-

4

e>f>

ble and contents and furthermore, theair may circulate freely about thecrucible within the cup. Suitable fittingsfor the cup are shown in Fig. 1.Centrifuge - one of such size and sodriven that a force equal to 1000 timesthe force of gravity may be exerted atthe centre of~gravity of the soil sample.Balance - sensitive to 0.001 g (seeIS 1433 : 1965 ).Oven - thermostatically controlled withinterior of non-corroding material tomaintain the temperature between 105Cand 110C.

5 SOIL SPECIMENA 5 g soil specimen shall be taken from thethoroughly mixed portion of the material pass-ing the 425-micron IS Sieve obtained in accor-dance with IS 2720 ( Part 1 ) : 1983.6 PROCEDUREWeigh the Gooch crucible empty and with apiece of dry filter paper which just covers thebottom of the crucible. Then place the soil ,_specimen in the crucible. Place the cruciblewith the soil specimen in a pan of distilledwater and allow specimen to take up moistureuntil completely saturated, as indicatid by thepresence of free water on the surface of thespecimen. Then place the crucible in a humi-difier for at least 12 hours to ensure uniformdistribution of moisture throughout the soilmass. Pour off all free water remaining onthe surface of the sample and place the cruci-Die in a Babcock trunnion cup fitted as descri-bed in 4 (c).Centrifuge the soil specimen for a period ofone hour at a speed which, for the diameter ofhead used, will exert a centrifugal force 1000times the force of gravity at the centre ofgravity of the soil specimen. Immediatelyafter centrifuging, weigh the crucible andcontents and record the mass. Then oven-drythe specimen to constant mass at a tempera-ture of 105C to 110C. Weigh the crucible andcontents and record the mass.

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IS 2720 Part 19 j : 1992

CENTRIFUGE HEADMOUNTINGS OF CENTRIFUGEMOISTURE EQUIVALENT APPARATUS

FIG. 1 CENTRIFUGEAPPARATUS

SECTION XX

GOOCH CRUCIBLEPERFORATED BOTTOM)

BRASS.RODSFOR SUPPORT

If the soil is waterlogged, that is, when freewater is observed on the top of the specimenafter the centrifuging operation, do not removethe free water but weigh it with the specimen.The test should be conducted at a temperatureof ( 27 f 2 )C.An allowance of 0.02 g shall be made ~for themoisture remaining in the filter paper aftercentrifuging.7 CALCULATIONThe centrifuge moisture equivalent of the soil 9.1.1 The results of the tests may be reportedshall be calculated by the following formula: in the form given below:

CME_ M2-~-0*02 I- MS-M, ) x 1wMa-4)where

CME = centrifuge moisture equivalent;

: :3.

variation between the two values obtained inthe duplicate tests should not exceed one per-cent for values of CME up to ,15 and 2 percentfor values above 15. If the results disagree bymore than the limits specified, the tests shallbe repeated.9 REPORT9.1 ~The average of the two results obtained( see 8 ) shall be reported as the CentrifugeMoisture Equivalent.

Determination No. I 1 I 2 IMass of crucible with drytiter paper (M,), in gMass of crucible and con-tents after centrifuging (M,),in gMass of crucible and con-tent after oven drying (MS),in g

M = mass of crucible and contents aftercentrifuging, in g; 4.fl = mass of crucible with dry filter paperin g; and

M, = Mass of crucible and contents after 5*. Centrifuge moisture equiva-lent I I Ioven arylng, In g.8 REPRODUCTIBILITY OF RESULTS AverageThe tests shall be made in duplicate. The Remarks: I I

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Dot : No. CED 23 ( 4994 )

Amendments Issued Since PublicationAmend No. Date of Issue Text Affected

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is.2720.19.1992 centrifuge moisture equivalent

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