1、Designation:C14411American Association State Highway and Transportation Officials StandardAASHTO No.:M45-70(1974)Standard Specification forAggregate for Masonry Mortar1This standard is issued under the fixed designation C144;the number immediately following the designation indicates the year oforigi
2、nal 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.This standard has been approved for use by agencies of the Department of Defense.1
3、.Scope1.1 This specification covers aggregate for use in masonrymortar.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 The following precautionary caveat pertains only to thetest methods portion,Section 7,of this standar
4、d.This standarddoes not purport to address all of the safety problems,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.2.Referenced Documents2.
5、1 ASTM Standards:2C40 Test Method for Organic Impurities in Fine Aggregatesfor ConcreteC87 Test Method for Effect of Organic Impurities in FineAggregate on Strength of MortarC88 Test Method for Soundness of Aggregates by Use ofSodium Sulfate or Magnesium SulfateC117 Test Method for Materials Finer t
6、han 75-m(No.200)Sieve in Mineral Aggregates by WashingC123 Test Method for Lightweight Particles in AggregateC128 Test Method for Density,Relative Density(SpecificGravity),and Absorption of Fine AggregateC136 Test Method for Sieve Analysis of Fine and CoarseAggregatesC142 Test Method for Clay Lumps
7、and Friable Particles inAggregatesC270 Specification for Mortar for Unit MasonryC404 Specification for Aggregates for Masonry GroutD75 Practice for Sampling Aggregates3.Materials and Manufacture3.1 Aggregate for use in masonry mortar shall consist ofnatural sand or manufactured sand.Manufactured san
8、d is theproduct obtained by crushing stone,gravel,or air-cooled ironblast-furnace slag specially processed to ensure suitable gra-dation.NOTE1Care should be taken to ensure a suitable particle shape,sinceexcessive quantities of flat and elongated particles have historically causedproblems with worka
9、bility.4.Grading4.1 Aggregate for use in masonry mortar shall be gradedwithin the following limits,depending upon whether naturalsand or manufactured sand is to be used:Percent PassingSieve DesignationNatural SandManufacturedSand4.75-mm(No.4)1001002.36-mm(No.8)95 to 10095 to 1001.18-mm(No.16)70 to 1
10、0070 to 100600-m(No.30)40 to 7540 to 75300-m(No.50)10 to 3520 to 40150-m(No.100)2 to 1510 to 2575-m(No.200)0 to 50 to 104.2 The aggregate shall not have more than 50%retainedbetween any two consecutive sieves of those listed in 4.1 normore than 25%between 300-m(No.50)and the 150-m(No.100)sieve.4.3 I
11、f the fineness modulus varies by more than 0.20 fromthe value assumed in selecting proportions for the mortar,theaggregate shall be rejected unless suitable adjustments aremade in proportions to compensate for the change in grading.NOTE2For heavy construction employing joints thicker than 12.5mm(12i
12、n.),a coarser aggregate may be desirable;for such work a fineaggregate conforming to Specification C404 is satisfactory.4.4 When an aggregate fails the gradation limits specified in4.1 and 4.2,its use is permitted provided the mortar can beprepared to comply with the aggregate ratio,water retention,
13、1This specification is under the jurisdiction of ASTM Committee C12 onMortars and Grouts for Unit Masonry and is the direct responsibility of Subcom-mittee C12.04 on Specifications for Aggregates for Mortars.Current edition approved July 1,2011.Published July 2011.Originally approvedin 1939.Last pre
14、vious edition approved in 2004 as C144 04.DOI:10.1520/C0144-11.2For 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.Cop
15、yright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 air content,and compressive strength requirements of theproperty specifications of Specification C270.5.Composition5.1 Deleterious SubstancesThe amount of deleterioussubstances in aggregate for
16、 masonry mortar,each determinedon independent samples complying with the grading require-ments of Section 4,shall not exceed the following:ItemMaximum PermissibleWeight PercentFriable particles1.0Lightweight particles,floating on liquid havinga specific gravity of 2.00.5AAThis requirement does not apply to blast-furnace slag aggregate.5.2 Organic Impurities:5.2.1 The aggregate shall be free of injurious amounts oforganic impurities.Except as herein provided,aggregatessubjected to the test for or