1、Designation:C89715Standard Specification forAggregate for Job-Mixed Portland Cement-Based Plasters1This standard is issued under the fixed designation C897;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A n
2、umber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers natural or manufactured aggre-gate for use in job-mixed base and finish-coat full thicknessportland cement-based
3、plasters.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 The text of this specification references notes andfootnotes that provide
4、 explanatory material.These notes andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of the specification.2.Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC40 Test Method for Organic Impuritie
5、s 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 than 75-m(No.200)Sieve in Mineral Aggregates by WashingC
6、123 Test Method for Lightweight Particles in AggregateC125 Terminology Relating to Concrete and Concrete Ag-gregatesC136 Test Method for Sieve Analysis of Fine and CoarseAggregatesC142 Test Method for Clay Lumps and Friable Particles inAggregatesD75 Practice for Sampling Aggregates3.Terminology3.1 D
7、efinitionsDefinitions used in this standard shall be inaccordance with Terminologies C11 and C125.3.2 Definitions of Terms Specific to This Standard:3.2.1 aggregate,na granular material such as natural ormanufactured sand used with a cementing medium to formplaster(stucco).3.2.2 manufactured sand,nt
8、he fine material resultingfrom the crushing and classification by screening,or otherwise,of rock,gravel,or blast furnace slag.3.2.3 natural sand,nthe fine granular material resultingfrom the natural disintegration of rock.4.Composition4.1 Deleterious SubstancesThe amount of deleterioussubstances in
9、aggregates,each determined on independentsamples complying with the grading requirements of Section 6,shall not be more than the following:ItemMaximumPermissibleWeight,%Friable particles1.0Light weight particles,floating on liquid having aspecific gravity of 2.00.54.2 Organic Impurities:4.2.1 The ag
10、gregate shall be free of injurious amounts oforganic impurities.Except as herein provided,aggregatessubjected to the test for Organic Impurities,Test Method C40,and producing a color darker than the standard shall berejected.4.2.2 Aggregate failing the test for organic impurities maybe used provided
11、 that,when tested for the effect of organicimpurities on strength in accordance with Test Method C87,therelative strength at seven days is not less than 95%.5.Physical Properties5.1 Soundness(see 7.1.7):5.1.1 Except as herein provided,aggregate subjected to fivecycles of the soundness test shall sho
12、w a loss,when weighed inaccordance with the grading of a sampling complying with thelimitations set forth in Section 6,not greater than 20%whensodium sulfate is used,or 15%when magnesium sulfate isused.1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building
13、Materials and Systems and is the direct responsibilityof Subcommittee C11.02 on Specifications and Test Methods for Accessories andRelated Products.Current edition approved June 1,2015.Published June 2015.Originallyapproved in 1978.Last previous edition approved in 2014 as C897 05(2014).DOI:10.1520/
14、C0897-15.2For 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.*A Summary of Changes section appears at the end of this
15、standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.2 Aggregates failing to meet the requirements of 5.1.1shall be accepted,provided there is evidence that plasters ofcomparable properties made from similar aggregates from thesame
16、 source has been exposed to weathering,similar to that tobe encountered,for a period of more than five years withoutappreciable disintegration.6.Dimensions,Mass,and Permissible Variations6.1 Aggregate for Base CoatAggregate for use in basecoat portland cement-based plasters shall be graded as follows:U.S.Standard SievePercent Retained(by Weight)Natural SandManufactured SandmaxminmaxminNo.4(4.75 mm)0000No.8(2.36 mm)100100No.16(1.18 mm)40104010No.30(600 m)65306530No.50(300 m)90708060No.100(150 m)1
