1、Designation: D5971 07D5971/D5971M 13Standard Practice forSampling Freshly Mixed Controlled Low-Strength Material1This standard is issued under the fixed designation D5971;D5971/D5971M; the number immediately following the designation indicatesthe year of original adoption or, in the case of revision
2、, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This practice explains the procedure for obtaining a representative sample of freshly mixed controlled
3、low-strength material(CLSM) as delivered to the project site on which tests are to be performed to determine compliance with quality requirements ofthe specifications under which the CLSM is furnished (Note 1). This practice includes sampling from revolving-drum truck mixersand from agitating equipm
4、ent used to transport central-mixed CLSM. This Practice is based on Practice C172 for concrete.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as the standard. The inch-poundequivalents are shown for information only.standard. The values stated in each syst
5、em may not be exact equivalents; therefore,each system shall be used independently of the other. Combining values from the two systems may result in non-conformance withthe standard.NOTE 1Composite samples are required by this practice unless specifically excepted by procedures governing the tests t
6、o be performed, such as teststo determine uniformity of consistency and mixer efficiency. Procedures used to select the specific test batches are not described in this practice. It isrecommended that random sampling be used to determine overall specification compliance.1.3 This standard does not pur
7、port to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use. (WarningFresh hydraulic cementitious mixtures
8、are caustic and may cause chemical burns to skin andtissue upon prolonged exposure.2)1.4 This practice offers a set of instructions for performing one or more specific operations. This document cannot replaceeducation or experience and should be used in conjunction with professional judgement. Not a
9、ll aspects of this practice may beapplicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which theadequacy of a given professional service must be judged, nor should this document be applied without consideration of a projectsmany unique a
10、spects. The word “standard” in the title of this document means only that the document has been approved throughthe ASTM consensus process.2. Referenced Documents2.1 ASTM Standards:3C172 Practice for Sampling Freshly Mixed ConcreteD653 Terminology Relating to Soil, Rock, and Contained FluidsD3740 Pr
11、actice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used inEngineering Design and ConstructionD4832 Test Method for Preparation and Testing of Controlled Low Strength Material (CLSM) Test CylindersD6023 Test Method for Density (Unit Weight), Yield, C
12、ement Content, and Air Content (Gravimetric) of ControlledLow-Strength Material (CLSM)D6103 Test Method for Flow Consistency of Controlled Low Strength Material (CLSM) (Withdrawn 2013)43. Terminology3.1 DefinitionsFor common definitions of terms in this standard, refer to Terminology D653.3.2 Defini
13、tions of Terms Specific to This Standard:1 This practice is under the jurisdiction of ASTM Committee D18 on Soil and Rock and is the direct responsibility of Subcommittee D18.15 on Stabilization WithAdmixtures.Current edition approved Nov. 1, 2007Aug. 1, 2013. Published December 2007August 2013. Ori
14、ginally approved in 1995. Last previous edition approved in 20012007as D5971 01.D5971 07. DOI: 10.1520/D5971-07.10.1520/D5971-13.2 Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, Vol 04.02.3 For referencedASTM standards, visit theASTM website,
15、www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.4 The last approved version of this historical standard is referenced on www.astm.org.This document is not an ASTM s
16、tandard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all c
17、ases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.1 composi
18、te sample, na sample that is constructed by combining equal portions of grab samples taken at two or moreregularly spaced intervals during discharge of the middle portion of the batch of CLSM.3.2.2 controlled low-strength material (CLSM), na mixture of Portland cement, fly ash, aggregates, water, an
19、d possiblychemical admixtures that, as the cement hydrates, forms a soil replacement material. The CLSM is a self compacting, flowable,cementitious material that is primarily used as a backfill or structural fill instead of compacted fill or unsuitable native soil.Depending on the amount of water us
20、ed in the CLSM mixture, it can be placed as a non-flowable compacted material or as amortar.3.2.3 flow consistency, nmeasured by the average diameter of the spread achieved by removal of the flow cylinder.4. Significance and Use4.1 This practice shall be used to provide a representative sample of th
21、e material for the purpose of testing various properties.The procedures used in sampling shall include the use of every precaution that will assist in obtaining samples that are trulyrepresentative of the nature and condition of the CLSM.NOTE 2The quality of the result produced by this standard is d
22、ependent on the competence of the personnel performing it and the suitability of theequipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objectivetesting/sampling/inspection/ and the like. Users of this standard are cautio
23、ned that compliance with Practice D3740 does not in itself assure reliableresults. Reliable results depend on many factors. Practice D3740 provides a means of evaluating some of these factors.5. Apparatus5.1 Hand ToolsShovels, hand scoops, and rubber gloves as required.5.2 ReceptacleA container of s
24、uitable size size, 14 L 0.5 ft3, and having a non-absorbent surface.6. Sampling6.1 Size of SampleThe sample of CLSM for compressive strength testing shall be a minimum of 14 L(0.50.5 ft 3). For othertests, the composite size shall be large enough to perform the test and to ensure a representative sa
25、mple of the batch was taken.6.2 The procedures used in sampling shall include the use of every precaution that will assist in obtaining samples that are trulyrepresentative of the nature and condition of CLSM sampled as outlined in 7.1.7. Procedure7.1 Sampling from Revolving-Drum Truck Mixers or Agi
26、tatorsSample the CLSM by collecting two or more portions takenat regularly spaced intervals during discharge of the middle portion of the batch (Note 3). These samples shall be obtained withinthe time limit specified in 7.2 and composited into one sample for test purposes. In any case do not obtain
27、samples until after allwater has been added to the mixer; also do not obtain samples from the very first or last portions of the batch discharge (Note 4).Sample by repeatedly passing a receptacle through the entire discharge stream or by completely diverting the discharge into asample container. Reg
28、ulate the rate of discharge of the batch by the rate of revolution of the drum and not by the size of the gateopening.NOTE 3Sampling normally should be performed on the CLSM as delivered from the truck to the job site excavation.NOTE 4No samples should be taken before 10 % or after 90 % of the batch
29、 has been discharged. Due to the difficulty of determining the actualquantity of CLSM discharged, the intent is to provide samples that are representative of widely separated portions, but not the beginning and the end ofthe load.7.2 The elapsed time between obtaining the first and final portions of
30、 the composite sample shall be as short as possible andin no instance shall it exceed 2 min.7.3 Transport the composite samples to the place where fresh CLSM tests are to be performed or where test specimens are tobe molded. The composite sample shall be combined and remixed with a shovel or scoop t
31、he minimum amount necessary to ensureuniformity and compliance with the minimum time limits specified in 7.4.7.4 Start tests for flow consistency (Test Method D6103), density (unit weight), and air content (Test Method D6023) within5 min after obtaining the final portion of the composite sample. Com
32、plete these tests as expeditiously as possible. Start moldingspecimens for strength tests (Test Method D4832) within 10 min after obtaining the final portion of the composite sample. Keepthe elapsed time between obtaining and using the sample as short as possible and protect the sample from the sun,
33、 wind, and othersources of rapid evaporation, and from contamination.8. Keywords8.1 air content; CLSM; composite sample; density; flow consistency; quality control; sampling; unit weightD5971/D5971M 132SUMMARY OF CHANGESCommittee D18 has identified the location of selected changes to this standard s
34、ince the last issue(D5971 01D5971 07) that may impact the use of this standard. (ApprovedAug. 1, 2013November 1, 2007.).)(1) Revised Sectionmeasurements 1.1 for clarity.throughout to modify this practice into a dual-units standard.(2) Made an addition to 1.3 safety caveat.(3) Added new footnote 2 re
35、ferencing addition to safety caveat.(4) Added new Section 5 on Apparatus and renumbered subsequent sections.(5) Added Section 6.2.(6) Revised Section 7.1 for clarity and also added Note 4.(7) Replaced “unit weight” with “density” in Section 7.4.(8) Added “sample” and “density” to Section 8.ASTM Inte
36、rnational 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 validity of any such patent rights, and the riskof infringement of such rights, are entirely
37、 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 comments are invited either for revision of this standard or for additional standardsand shou
38、ld 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 not received a fair hearing you shouldmake your views known to the ASTM Committee on Stan
39、dards, 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D5971/D5971M 133
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