1、Designation: C144 11American 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 of
2、original 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 o
3、f Defense.1. 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,
4、of this standard. 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. Ref
5、erenced Documents2.1 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 fo
6、r Materials Finer than 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 Tes
7、t Method for Clay Lumps 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 manufactu
8、red sand. Manufactured sand is theproduct obtained by crushing stone, gravel, or air-cooled ironblast-furnace slag specially processed to ensure suitable gra-dation.NOTE 1Care should be taken to ensure a suitable particle shape, sinceexcessive quantities of flat and elongated particles have historic
9、ally causedproblems with workability.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 Designation Natural Sand ManufacturedSand4.75-mm (No. 4) 100 1002.36-mm (No. 8
10、) 95 to 100 95 to 1001.18-mm (No. 16) 70 to 100 70 to 100600-m (No. 30) 40 to 75 40 to 75300-m (No. 50) 10 to 35 20 to 40150-m (No. 100) 2 to 15 10 to 2575-m (No. 200) 0 to 5 0 to 104.2 The aggregate shall not have more than 50 % retainedbetween any two consecutive sieves of those listed in 4.1 norm
11、ore than 25 % between 300-m (No. 50) and the 150-m(No. 100) sieve.4.3 If 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 grad
12、ing.NOTE 2For heavy construction employing joints thicker than 12.5mm (12 in.), a coarser aggregate may be desirable; for such work a fineaggregate conforming to Specification C404 is satisfactory.1This specification is under the jurisdiction of ASTM Committee C12 onMortars and Grouts for Unit Mason
13、ry 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 previous edition approved in 2004 as C144 04. DOI: 10.1520/C0144-11.2For referenced ASTM standards, vi
14、sit 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-
15、2959, United States.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,air content, and compressive strength requirements of theproperty specifications of Specification
16、C270.5. Composition5.1 Deleterious SubstancesThe amount of deleterioussubstances in aggregate for masonry mortar, each determinedon independent samples complying with the grading require-ments of Section 4, shall not exceed the following:Item Maximum PermissibleWeight PercentFriable particles 1.0Lig
17、htweight 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 fo
18、r organic impurities and producing acolor darker than the standard shall be rejected.5.2.2 Aggregate failing in the test may be used, providedthat the discoloration is due principally to the presence of smallquantities of coal, lignite, or similar discrete particles.5.2.3 Aggregate failing in the te
19、st may be used providedthat, when tested for the effect of organic impurities on strengthof mortar, the relative strength at seven days calculated inaccordance with the Procedure Section of Test Method C87,isnot less than 95 %.6. Soundness6.1 Except as herein provided, aggregate subjected to fivecyc
20、les of the soundness test shall show a loss, weighted inaccordance with the grading of a sample complying with thelimitations set forth in Section 4, not greater than 10 % whensodium sulfate is used or 15 % when magnesium sulfate isused.6.2 Aggregate failing to meet the requirements of 6.1 maybe acc
21、epted, provided that mortar of comparable propertiesmade from similar aggregates from the same source has beenexposed to weathering, similar to that to be encountered, for aperiod of more than five years without appreciable disintegra-tion.7. Test Methods for Sampling and Testing7.1 Sample and test
22、the aggregate in accordance with thefollowing standards, except as otherwise provided in thisspecification:7.1.1 SamplingPractice D75.7.1.2 Sieve Analysis and Fineness ModulusMethod C136.7.1.3 Amount of Material Finer Than (75-m) No. 200SieveTest Method C117.7.1.4 Organic ImpuritiesTest Method C40.7
23、.1.5 Effect of Organic Impurities on StrengthTestMethod C87.7.1.6 Friable ParticlesTest Method C142.7.1.7 Lightweight ConstituentsTest Method C123.7.1.8 SoundnessTest Method C88.7.1.9 DensityDetermine the density of the fine aggregatein accordance with Test Method C128. In calculating the aircontent
24、 of mortars, use the method described in SpecificationC270.8. Keywords8.1 aggregate; fine aggregate; masonry; mortar; sand;soundnessASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard
25、 are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif n
26、ot revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which
27、 you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,Uni
28、ted States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C144 112
