1、Designation: D 5971 01Standard Practice forSampling Freshly Mixed Controlled Low-Strength Material1This standard is issued under the fixed designation D 5971; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. A number in 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 practice explains the procedure for obtaining arepresentative sample to test of freshly mixed controlledlowstrength materi
3、al (CLSM) as delivered to the project site(Note 1). This practice includes sampling from revolving-drumtruck mixers and from agitating equipment used to transportcentral-mixed CLSM.1.2 The values stated in SI units are to be regarded as thestandard. The inch-pound equivalents are shown for informa-t
4、ion only.NOTE 1Composite samples are required by this practice unlessspecifically excepted by procedures governing the tests to be performed,such as tests to determine uniformity of consistency and mixer efficiency.Procedures used to select the specific test batches are not described in thispractice
5、. It is recommended that random sampling be used to determineoverall specification compliance.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health pra
6、ctices and determine the applica-bility of regulatory limitations prior to use.1.4 This practice offers a set of instructions for performingone or more specific operations. This document cannot replaceeducation or experience and should be used in conjunctionwith professional judgement. Not all aspec
7、ts of this practicemay be applicable in all circumstances. This ASTM standard isnot intended to represent or replace the standard of care bywhich the adequacy of a given professional service must bejudged, nor should this document be applied without consid-eration of a projects many unique aspects.
8、The word “stan-dard” in the title of this document means only that thedocument has been approved through the ASTM consensusprocess.2. Referenced Documents2.1 ASTM Standards:D 653 Terminology Relating to Soil, Rock, and ContainedFluids2D 3740 Practice for Minimum Requirements for AgenciesEngaged in t
9、he Testing and/or Inspection of Soil and Rockas Used in Engineering Design and Construction2D 4832 Test Method for Preparation and Testing of Con-trolled Low Strength Material (CLSM) Test Cylinders2D 6023 Test Method for Unit Weight, Yield and Air Content(Gravimetric) of Controlled Low Strength Mate
10、rial(CLSM)3D 6103 Test Method for Flow Consistency of ControlledLow Strength Material (CLSM)33. Terminology3.1 Definitions: For common definitions of terms in thisstandard, refer to Terminology D 653.3.2 Definitions of Terms Specific to This Standard:3.2.1 composite sample, na sample that is constru
11、cted bycombining equal portions of grab samples taken at two or moreregularly spaced intervals during discharge of the middleportion of the batch of CLSM.3.2.2 controlled low-strength material (CLSM), na mix-ture of Portland cement, fly ash, aggregates, water, andpossibly chemical admixtures that, a
12、s the cement hydrates,forms a soil replacement material. The CLSM is a selfcompacting, flowable, cementitious material that is primarilyused as a backfill or structural fill instead of compacted fill orunsuitable native soil. Depending on the amount of water usedin the CLSM mixture, it can be placed
13、 as a non-flowablecompacted material or as a mortar.3.2.3 flow consistency, nmeasured by the average diam-eter of the spread achieved by removal of the flow cylinder.4. Significance and Use4.1 This practice shall be used to provide a representativesample of the material for the purpose of testing va
14、riousproperties. The procedures used in sampling shall include theuse of every precaution that will assist in obtaining samplesthat are truly representative of the nature and condition of theCLSM.NOTE 2The quality of the result produced by this standard isdependent on the competence of the personnel
15、 performing it and thesuitability of the equipment and facilities used. Agencies that meet thecriteria of Practice D 3740 are generally considered capable of competent1This practice is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.1
16、5 on Stabilization withAdmixtures.Current edition approved Nov. 10, 2001. Published February 2002. Originallypublished as PS 30 95. Last previous edition D 5971 96.2Annual Book of ASTM Standards, Vol 04.08.3Annual Book of ASTM Standards, Vol 04.09.1*A Summary of Changes section appears at the end of
17、 this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.and objective testing/sampling/inspection/ and the like. Users of thisstandard are cautioned that compliance with Practice D 3740 does not initself assure reliable results
18、. Reliable results depend on many factors.Practice D 3740 provides a means of evaluating some of these factors.5. Sampling5.1 Size of SampleThe sample of CLSM for compressivestrength testing shall be a minimum of 14 L (0.5 ft3). For othertests, the composite size shall be large enough to perform the
19、test and to ensure a representative sample of the batch wastaken.6. Procedure6.1 Sampling from Revolving-Drum Truck Mixers orAgitatorsSample the CLSM at two or more regularly spacedintervals during discharge of the middle portion of the batch.These grab samples shall be obtained within the time limi
20、tspecified in 6.2 and composited into one sample for testpurposes. In any case do not obtain samples until after all waterhas been added to the mixer; also do not obtain samples fromthe very first or last portions of the batch discharge. Sample byrepeatedly passing a receptacle through the entire di
21、schargestream or by completely diverting the discharge into a samplecontainer. Regulate the rate of discharge of the batch by the rateof revolution of the drum and not by the size of the gateopening.NOTE 3Sampling normally should be performed on the CLSM asdelivered from the truck to the job site ex
22、cavation.6.2 The elapsed time between obtaining the first and finalportions of the composite sample shall be as short as possibleand in no instance shall it exceed 2 min.6.3 Transport the composite samples to the place wherefresh CLSM tests are to be performed or where test specimensare to be molded
23、. The composite sample shall be combined andremixed with a shovel or scoop the minimum amount neces-sary to ensure uniformity and compliance with the minimumtime limits specified in 6.4.6.4 Start tests for flow consistency (Test Method D 6103),unit weight, and air content (Test Method D 6023) within
24、 5 minafter obtaining the final portion of the composite sample.Complete these tests as expeditiously as possible. Start mold-ing specimens for strength tests (Test Method D 4832) within10 min after obtaining the final portion of the compositesample. Keep the elapsed time between obtaining and using
25、 thesample as short as possible and protect the sample from thesun, wind, and other sources of rapid evaporation, and fromcontamination.7. Keywords7.1 air content; CLSM; composites; flow consistency; qual-ity control; sampling; unit weightSUMMARY OF CHANGESThis section identifies the principle chang
26、es to this guide thathave been incorporated since the last issue.(1) SI units made the standard.(2) Added section 1.4 the “Professional Judgement” caveat.(3) Revised sections 2.1 and 6.4 to reflect current titles ofstandards.(4) Revised section 3 on Terminology in accordance withD18s Standards Prepa
27、ration Manual.(5) Added Note 2 referencing Practice D3740 in accordancewith D18 policy. Renumbered subsequent notes.(6) Added “Summary of Changes” section.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.
28、 Users of this standard 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 e
29、very five years andif not 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 tec
30、hnical committee, which 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,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).D 59712
