1、Designation: C 144 04American Association State Highway and Transportation Officials StandardAASHTO No.: M45-70 (1974)Standard Specification forAggregate for Masonry Mortar1This standard is issued under the fixed designation C 144; the number immediately following the designation indicates the year
2、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.This standard has been approved for use by agencies of the Departmen
3、t of 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
4、7, 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.
5、Referenced Documents2.1 ASTM Standards:2C40 Test Method for Organic Impurities in Fine Aggre-gates for 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 Meth
6、od for Materials Finer than 75-m (No.200) Sieve in Mineral Aggregates by WashingC 123 Test Method for Lightweight Pieces in AggregateC 128 Test Method for Specific Gravity and Absorption ofFine AggregateC 136 Test Method for Sieve Analysis of Fine and CoarseAggregatesC 142 Test Method for Clay Lumps
7、 and Friable Particles inAggregatesC 270 Specification for Mortar for Unit MasonryC 404 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. Manufacture
8、d 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 historically causedproblems w
9、ith 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 Size Natural Sand ManufacturedSand4.75-mm (No. 4) 100 1002.36-mm (No. 8) 95 to 100 95 to 1001.18-mm
10、 (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 normore than 25 % between 300-m
11、(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 grading.NOTE 2For heavy construc
12、tion employing joints thicker than 12.5mm (12 in.), a coarser aggregate may be desirable; for such work a fineaggregate conforming to Specification C 404 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
13、to comply with the aggregate ratio, water retention,1This specification is under the jurisdiction of ASTM Committee C12 onMortars for Unit Masonry and is the direct responsibility of Subcommittee C12.04on Specifications for Aggregates for Mortar.Current edition approved Dec. 1, 2004. Published Janua
14、ry 2005. Originallyapproved in 1939. Last previous edition approved in 2003 as C 144 03.2For 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 Summa
15、ry page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.air content, and compressive strength requirements of theproperty specifications of Specification C 270.5. Composition5.1 Deleterious SubstancesThe amount of
16、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 1.0Lightweight particles, floating on liquid havinga specific gra
17、vity 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 organic impurities and producing acolor darker than the s
18、tandard 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 test may be used providedthat, when tested for the effect of
19、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 fivecycles of the soundness test shall show a loss, weighted inacc
20、ordance 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 accepted, provided that mortar of comparable propertiesmade fr
21、om 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 the aggregate in accordance with thefollowing standards, ex
22、cept as otherwise provided in thisspecification:7.1.1 SamplingPractice D75.7.1.2 Sieve Analysis and Fineness ModulusMethodC 136.7.1.3 Amount of Material Finer Than (75-m) No. 200SieveTest Method C117.7.1.4 Organic ImpuritiesTest Method C40.7.1.5 Effect of Organic Impurities on StrengthTestMethod C87
23、.7.1.6 Friable ParticlesTest Method C 142.7.1.7 Lightweight ConstituentsTest Method C 123.7.1.8 SoundnessTest Method C88.7.1.9 DensityDetermine the density of the fine aggregatein accordance with Test Method C 128. In calculating the aircontent of mortars, use the method described in SpecificationC
24、270.8. 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 are expressly advised that determination of the validi
25、ty 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 not revised, either reapproved or withdrawn. Your commen
26、ts 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 you may attend. If you feel that your comments have no
27、t 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,United 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).C144042
