ASTM_D_6928_-_17.pdf

Designation:D692817Standard Test Method forResistance of Coarse Aggregate to Degradation by Abrasionin the Micro-Deval Apparatus1This standard is issued under the fixed designation D6928;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()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers a procedure for testing coarseaggregate for resistance to abrasion using the Micro-Devalapparatus.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 The text of this method references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the test method.1.4 This procedure may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety concerns,if any,associated with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C136 Test Method for Sieve Analysis of Fine and CoarseAggregatesC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 Definitions:3.1.1 constant mass,nthe condition of a test sample driedat a temperature of 110 6 5 C such that it will not lose morethan 0.1%moisture after 2 h of drying.3.1.1.1 DiscussionSuch a condition of dryness can beverified by determining the mass of the sample before and aftersuccessive 2-h drying periods.In lieu of such a determination,samples may be considered to have reached constant masswhen they have been dried at a temperature of 110 6 5 C foran equal or longer period than that previously found adequatefor producing the desired constant mass condition under equalor heavier loading conditions of the oven.4.Summary of Test Method4.1 The Micro-Deval test is a measure of abrasion resistanceand durability of mineral aggregates resulting from a combi-nation of actions including abrasion and grinding with steelballs in the presence of water.A sample with standard gradingis initially soaked in water for not less than 1 h.The sample isthen placed in a jar mill with 2.0 L of water and an abrasivecharge consisting of 5000 g of 9.5-mm diameter steel balls.The jar,aggregate,water,and charge are revolved at 100 rpmfor up to 2 h,depending on the particle size.The sample is thenwashed and oven dried.The loss is the amount of materialpassing the 1.18-mm sieve expressed as a percent by mass ofthe original sample.5.Significance and Use5.1 The Micro-Deval abrasion test is a test of coarseaggregate to determine abrasion loss in the presence of waterand an abrasive charge.Many aggregates are more susceptibleto abrasion when wet than dry,and the use of water in this testincorporates this reduction in resistance to degradation incontrast to some other tests,which are conducted on dryaggregate.The test results are helpful in evaluating thetoughness/abrasion resistance of coarse aggregate subject toabrasion when adequate information is not available fromservice records.5.2 The Micro-Deval abrasion test is useful for detectingchanges in properties of aggregate produced from an aggregatesource as part of a quality control or quality assurance process.1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.51 onAggregate Tests.Current edition approved April 1,2017.Published April 2017.Originallyapproved in 2003.Last previous edition approved in 2010 as D6928 10.DOI:10.1520/D6928-17.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 6.Apparatus6.1 Micro-Deval Abrasion