ASTM_C_1137_-_05.pdf

Designation:C 1137 05Standard Test Method forDegradation of Fine Aggregate Due to Attrition1This standard is issued under the fixed designation C 1137;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method provides a procedure for indicating therelative degree to which a fine aggregate is likely to degradedue to the mixing and agitation of hydraulic cement concrete.1.2 The values given in SI units are to be regarded as thestandard.The values given in inch-pound units are for infor-mation only.1.3 The text of this test method references notes andfootnotes which provide explanatory material.These notes andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of this test method.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C 33 Specification for Concrete AggregatesC 117 Test Method for Materials Finer Than 75-m(No.200)Sieve in Mineral Aggregates by WashingC 125 Terminology Relating to Concrete and ConcreteAggregatesC 136 Test Method for Sieve Analysis of Fine and CoarseAggregatesC 295 Guide for Petrographic Examination of Aggregatesfor ConcreteC 670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC 702 Practice for Reducing Samples of Aggregate toTesting SizeD 75 Practice for Sampling AggregatesE 11 Specification for Wire Cloth and Sieves for TestingPurposes3.Summary of Test Method3.1 A specimen of fine aggregate,of specified grading,issubjected to vigorous agitation under water from the action ofa high-speed impeller.Degradation is measured by the de-crease in fineness modulus(as defined in Terminology C 125)and the increase in amount of material finer than the 75-m(No.200)sieve.4.Significance and Use4.1 The tendency of some fine aggregates,including thosethat comply with the requirements of Specification C 33,todegrade from the grinding action in a concrete mixer mayaffect mixing water demand,entrained air,and slump.When itis suspected that degradation during mixing is a problem,thistest method may be useful for evaluating the extent of theproblem.4.2 This test method is of use for preliminary screening toindicate the need for further evaluation through petrographicexamination(Guide C 295)or testing the quality of mortar,orconcrete,or both made from the fine aggregate in question.4.3 This test method is of use for comparing the resultsobtained with unknown materials against those with materialsof known performance in concrete.5.Apparatus5.1 Sieves,conforming to Specification E 11:75-m(No.200),150-m(No.100),300-m(No.50),600-m(No.30),1.18-mm(No.16),2.36-mm(No.8),4.75-mm(No.4),and9.5-mm(38-in.).5.2 BalanceA balance or scale readable and accurate to0.1 g or 0.1%of the test specimen mass,whichever is greater,at any point within the range of use.5.3 OvenAn oven of appropriate size capable of main-taining a uniform temperature of 110 6 5 C(230 6 9 F).1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.20 on Normal Weight Aggregates.Current edition approved July 15,2005.Published August 2005.Originallyapproved in 1990.Last previous edition approved in 1997 as C 1137 97.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.5.4 Attrition DeviceA stainless steel octagonal tank,140mm(512in.)high and 110 mm(412in.)minimum inside width,with a motor-driven 19-mm(34-in.)vertical shaft so mountedthat it can be lowered into the desired position within theoctagonal tank.Mounted on the shaft there shall be threehorizontal sets of six pitched stainless steel blades3.A lid shallbe provided with a hole for the shaft.See Figs.1 and 2.5.5 Rotating DeviceAn electric motor-driven device ordrill press suitable for driving the impeller clockwise as shownin Fig.1.It shall be capable of driving the impeller at 850 650 r/min with the specimen and water in the tank.6.Sample Preparation6.1 Sample the aggregate in accordance with Practice D 75and reduce to test specimen size in accordance with PracticeC 702.6.2 Prepare a test specimen of 500 6 5 g to a grading listedin Table 1.If