Concrete will not bc weakened by shock or by heating

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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 dcparts.from the me;ln by more than O-25 cm ( or & in ) shall bc salved or tooled until they conform to these tolerances. B-6.2 Moisture Conditioning - Test specimens shall be completely submerged in water at room temperature for 40 to 48 hours immediately prior to the compression test. Specimens shall be tested promptly after 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 diamder determined to the nearest 0.25 cm ( or O-1 in ) from two mt*asnrcments taken at right angles near the ccntre of the length. B-6.5 Calculation and Report - ‘l’hc direction of the npl)lication of the load with referen& to direction of compaction of the concrctc, in tlie The compressive strength of rach sprscimcm structure 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 the compressive strength hy the applicable correction factor given in the following table. Values not given in the table shall be deterinined by interpolation. STRENGTH CORRECTION FACTOR 0.98 0.96 o-94 0.90 0.8:’ 0.70 0.50 RATIO ok LENGTH 0~ CYLINDER TO DIAMETER 1.75 l-50 1.25 1.10 l-00 0.75 0.50 APPliNDIX C ( Clause 7.6 ) FLEXURAL C-l. STRENGTH BEAM WITH OF CONCRETE (USING THIRD-POINT LOADING ) SIMPLE SCOPE C-l.1 This method of test covers the procedurr for determining the flexural strength of concrete by the use of a simplc~ hram with third-point loading. 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 which accomplishes this purpose 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 OR LINE BEARING OVER FULL WIDTH OF SPECIMEN STEEL ROD STEEL BALL BED OF TESTING Fw.4 D...
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This document was uploaded on 10/01/2013.

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