1、Designation:D 2901 99Standard Test Method forCement Content of Freshly Mixed Soil-Cement1This standard is issued under the fixed designation D 2901;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in
2、 parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers determination of the cementcontent of samples of freshly-mixed soil-cement.1.2 This standard does not purport to address a
3、ll of thesafety problems,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 applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D 806 Test Method for Ce
4、ment Content of Soil-CementMixtures2D 1293 Test Methods for pH of Water3D 3740 Practice for Minimum Requirements for AgenciesEngaged in the Testing and/or Inspection of Soil and Rockas Used in Engineering Design and Contruction2D 4753 Specification for Evaluating,Selecting,and Speci-fying Balances a
5、nd Scales for Use in Testing Soil,Rock,and Related Construction Materials2E 11 Specification for Wire-Cloth Sieves for Testing Pur-poses43.Summary of Test Method3.1 A weighed sample of the fresh material passing a 4.75mm sieve is extracted with an ammonium chloride solution.After allowing the sample
6、 to settle,an aliquot of the superna-tant is diluted with water.The pH is adjusted to 13 andtriethanolamine is added to complex interferants.The sample istitrated with EDTA solution to the blue endpoint of hydrox-ynaphthol blue indicator.The cement content is read from acalibration curve prepared fr
7、om titrations of several knowncement content mixes made with the same water,soil,andcement as the sample.4.Significance and Use4.1 This test method determines cement content in mixturesof cement with soil or aggregate by chemical analysis.It wasdeveloped primarily as a relatively quick test for use
8、at theconstruction site to determine compliance with specifications.The method is for materials tested soon after the completion ofmixing;Test Method D 806 may be used for testing samplesfor which a significant degree of cement hydration or harden-ing has taken place.NOTE1Notwithstanding the stateme
9、nts on precision and bias con-tained in this test method;the precision of this test method is dependenton the competence of the personnel preforming it,and the suitability of theequipment and facilities used.Agencies which meet the criteria of PracticeD 3740 are generally considered capable of compe
10、tent and objectivetesting.Users of this test method are cautioned that compliance withPractice D 3740 does not in itself assure reliable testing.Reliable testingdepends on many factors;Practice D 3740 provides a means of evaluatingsome of those factors.5.Apparatus5.1 Balance,meeting Specification D
11、4753(Class GP2)andhaving a capacity of 1000 g or more and a sensitivity of 0.1 g.5.2 GlasswareA 25-mL and a 1000-mL graduated cylin-der,25-mL burets,10-mL syringes or volumetric pipets,250-mL beakers,medicine droppers.5.3 Plasticware,2-L(2-qt)polyethylene containers withsnap-on covers,300 mm(12-in.)
12、diameter plastic funnel,20-Lpolyethylene bottles for ammonium chloride and distilled ordemineralized water.5.4 Buret Stand for 25-mL buret.5.5 Magnetic Stirrer and Stirring Bar.5.6 Stirring Rods,stainless steel stirring rods approximately300 mm(12-in.)long.5.7 pH Meter,or Indicator Paper(pH range fr
13、om 10 to14)A portable,combination-electrode pH meter is recom-mended to obtain accurate results as the pH adjustment ismade.Indicator paper can be used as an alternate,but lessaccurate,means of measuring the pH adjustment.5.8 SieveA 4.75 mm(No.4)sieve conforming to therequirements of Specification E
14、 11.6.Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended that1This test method is under the jurisdiction of ASTM Committee D-18 on Soiland Rock and is the direct responsibility of Subcommittee D18.15 on Stabilizationwith Admixtur
15、es.Current edition approved Jan.10,1999.Published April 1999.Original editionpublished as D 2901 70.Last previous edition D 2901 93.2Annual Book of ASTM Standards,Vol 04.08.3Annual Book of ASTM Standards,Vol 11.01.4Annual Book of ASTM Standards,Vol 14.02.1*A Summary of Changes section appears at the
16、 end of this standard.AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.5Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the dete
