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Unformatted text preview: he same diamctcr as the body of the specimen.
The ends of spccimcns wh,ich huvo projections of 0.5 cm ( or b_in ) or more above the normal
plane, or which dcp;Lrt from pcrpcn~licularity
to the axis by more than
5 dcgrccs, or whose&uuctcr
by more than O-25 cm
( or & in ) shall bc salved or tooled until they conform to these tolerances.
- Test specimens
shall be completely
submerged in water at room temperature
for 40 to 48 hours immediately
prior to the compression
Specimens shall be tested promptly
removal from water storage.
During the period between removal from
the water storage and testing, the specimens shall be kept moist by covering
with a wet burlap or blanket.
They shall be tested in a moist condition.
40 IS : 457 - 1957
B-6.3 CappinB - Before making
specimen shall he capped in order
pendix E of IS: 456-1957. the compression
test, the ends of the
to meet the requirements
given in Ap- B-6.4 Measurement-Prior
to testing, the length of the capl’cd spctcimen shall be measured to the nearest 0.25 cm ( or 0.1 in j and its average
to the nearest 0.25 cm ( or O-1 in ) from two mt*asnrcments taken at right angles near the ccntre of the length.
and Report - ‘l’hc direction
of the npl)lication
the load with referen& to direction of compaction
of the concrctc, in tlie
strength of rach sprscimcm
shall he reported.
shall be calculated in kg per ~q cm ( or lb per sq in ) hasetl on ttle average
If the ratio of lengtll to diamctcr of LI specidiameter of the speciinen.
men is appreciably
less than two, allowance for the ratio of length to diaT
meter shall be made by multiplying
strength hy the applicable correction
factor given in the following table.
Values not given
in the table shall be deterinined
0.50 RATIO ok LENGTH 0~
CYLINDER TO DIAMETER
0.50 APPliNDIX C ( Clause 7.6 )
BEAM WITH OF
) SIMPLE SCOPE C-l.1 This method of test covers the procedurr
flexural strength of concrete by the use of a simplc~ hram with third-point
C-2. APPARATUS C-2.1 The third-point
loading method shall be used in making flexurc
tests of concrete employing
bearing blocks which sha!l iusure that forces
41 IS : 457 - 1957
applied to the- beam are vertical only and applied without
A diagram of an apparatus
Fig. 4. eccentricity.
is shown in NOTE-Sometimes
methods of load application other than the one described
in this appendix are used in the field.
If such methods are used, the results should
he correlated with those obtained with the method descrikd
in this appendix.
HEAD OF TESTING
STEEL BALL TEST SPECIMEN CYLINDRICAL
OVER FULL WIDTH
STEEL BALL BED OF TESTING Fw.4 D...
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This document was uploaded on 10/01/2013.
- Fall '13