1、Designation:D4792/D4792M13Standard Test Method forPotential Expansion of Aggregates from HydrationReactions1This standard is issued under the fixed designation D4792/D4792M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of
2、last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of potentialvolume expansion of dense graded compacted aggregates thatcontain com
3、ponents susceptible to hydration and consequentvolume increase,such as the free calcium and magnesiumoxides that occur in some industrial by-products.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact
4、 equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.NOTE1Sieve size is identified by its standard designation in Speci-fication E11.The alternative designation given in parentheses is forinform
5、ation only and does not represent a different standard sieve size.1.3 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 applic
6、a-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C702 Practice for Reducing Samples ofAggregate to TestingSizeD75 Practice for Sampling AggregatesD698 Test Methods for Laboratory Compaction Character-istics of Soil Using Standard Effort(12 400 ft-lbf/ft3(600k
7、N-m/m3)D1883 Test Method for CBR(California Bearing Ratio)ofLaboratory-Compacted SoilsD2940 Specification for Graded Aggregate Material ForBases or Subbases for Highways or AirportsE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Summary of Test Method3.1 This test method consists o
8、f measuring the volumeexpansion of compacted specimens following the generalprocedures of Test Method D1883.Compaction is based onmaximum density determination using Test Methods D698.Toaccelerate the hydration reaction,specimens are stored in waterat 70 6 3C 158 6 5F for a minimum of 7 days.4.Signi
9、ficance and Use4.1 This test method provides a procedure for determiningthe compliance of steel slags and other materials withspecifications,such as Specification D2940,that limit permis-sible expansion of base and subbase aggregates containingcomponents subject to hydration.4.2 This test method can
10、 also be used to evaluate theeffectiveness of aging or other treatments for reducing theexpansive potential of such materials.4.3 Test results have not been correlated with fieldperformance,and values obtained do not necessarily indicateexpansion that may occur in service conditions.5.Apparatus5.1 M
11、olds,Spacer Disks,Expansion Measuring Apparatus,Stainless Steel Weights,and Dial Gages conforming to therequirements of Test Method D1883.5.2 Mixing Bowl,Straight-Edge,Scale,Filter Paper,Dishes,etc.as required in Test Methods D698 and D1883.5.3 Water Storage FacilityAwater bath controlled at 70 63C
12、158 6 5F or suitable tanks or buckets for submersion ofthe test specimens in an oven controlled so as to maintain thatwater temperature.6.Sampling6.1 To determine compliance with specifications,take fieldsamples in accordance with Practice D75 or the requirementsof the project specifications.1This t
13、est 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 June 1,2013.Published June 2013.Originallyapproved in 1988.Last previous edition approved in 2006 as D4792 00(2006
14、).DOI:10.1520/D4792_D4792M-13.2For 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 Bar
15、r Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.2 Take samples for research or general evaluation pur-poses in a manner appropriate for the materials and purposesinvolved.6.3 Keep samples at field moisture content until the time ofthe test by sealing in water-tight contai
16、ners or plastic bags.7.Preparation of Sample7.1 Reduce the field sample to testing size in accordancewith Practice C702,obtaining two 18-kg 40-lb portions.7.2 Pass the samples through the 19.0-mm 34-in.and4.75-mm(No.4)sieves.If 10%or more is retained on the19.0-mm 34-in.sieve proceed to 7.2.1 for oversize correction.7.2.1 Pass the material through a 75-mm 3-in.sieve.Discard the material retained on the 75-mm 3-in.sieve.Thematerial passing the 75-mm 3-in.sieve and retained on the19-mm 34-in.sieve
