1、Designation: D5971/D5971M 13D5971/D5971M 16Standard Practice forSampling Freshly Mixed Controlled Low-Strength Material1This standard is issued under the fixed designation D5971/D5971M; the number immediately following the designation indicates theyear of original adoption or, in the case of revisio
2、n, 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 equip
4、ment 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 standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used i
5、ndependently of the other. Combining values from thetwo systems may result in non-conformance with the standard.NOTE 1Composite samples are required by this practice unless specifically excepted by procedures governing the tests to be performed, such as teststo determine uniformity of consistency an
6、d 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 purport to address all of the safety concerns, if any, associated with it
7、s 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 are caustic and may cause chemical burns to skin andtissue upon prolon
8、ged 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 all aspects of this practice may beapplicable in all circumstances. Thi
9、s 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 aspects. The word “standard” in the title of this document means only t
10、hat 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 Practice for Minimum Requirements for Agencies Engaged in Testing and/or
11、 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, Cement Content, and Air Content (Gravimetric) of ControlledLow-Strength
12、 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 D653.3.1 Definitions of Terms Specific to This Standard:Definitions:1 This practice i
13、s 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 Aug. 1, 2013Dec. 1, 2016. Published August 2013December 2016. Originally approved in 1995. Last previous edition approved i
14、n 20072013as D5971 07.D5971 13. DOI: 10.1520/D5971-13.10.1520/D5971_D5971M-16.2 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, www.astm.org, or contactASTM Customer Service at se
15、rviceastm.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 standard and is intended only to provide the user of
16、 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 cases only the current versionof the standard as pub
17、lished 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 composite sample, na sample that is constructed by combini
18、ng equal portions of grab samples taken at two or moreregularly spaced intervals during discharge of the middle portion of the batch of CLSM.3.1.1 For definitions of common technical terms in this standard, refer to Terminology D653.3.1.2 controlled low-strength material (CLSM), na mixture of Portla
19、nd cement, fly ash, aggregates, water, and 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
20、 soil.Depending on the amount of water used in the CLSM mixture, it can be placed as a non-flowable compacted material or as amortar. soil, aggregates (sand, gravel, or both), cementitious materials, water, and sometimes admixtures, that hardens into amaterial with a higher strength than the soil, b
21、ut less than about 8400 kPa 1200 psi.3.1.2.1 DiscussionUsed as a replacement for compacted backfill, CLSM can be placed as a slurry, a mortar, or a compacted material and typicallyhas strengths of 350 to 700 kPa 50 to 100 psi for most applications.3.2.3 flow consistency, nmeasured by the average dia
22、meter of the spread achieved by removal of the flow cylinder.3.2 Definitions of Terms Specific to This Standard:3.2.1 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 represe
23、ntative sample of the 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 b
24、y this standard is dependent 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
25、 standard are cautioned 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 Recept
26、acleA container of suitable 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 L0.5 ft 3. For other tests,the composite size shall be large enough to perform the test and to ensure a represe
27、ntative sample 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 Mix
28、ers or AgitatorsSample 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 n
29、ot obtain 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 cont
30、ainer. Regulate 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
31、 the batch 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 p
32、ortions of 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
33、or scoop the 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 s
34、ample. Complete these tests as expeditiously as possible. Start moldingD5971/D5971M 162specimens 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 protec
35、t the sample from the sun, wind, and othersources of rapid evaporation, and from contamination.8. Keywords8.1 air content; CLSM; composite sample; density; flow consistency; quality control; sampling; unit weightSUMMARY OF CHANGESCommittee D18 has identified the location of selected changes to this
36、standard since the last issue(D5971 07D5971 13) that may impact the use of this standard. (Approved(DecemberAug. 1, 2013.)1, 2016)(1) Revised measurementsSection 3throughout to modify this practice into a dual-units standardASTM International takes no position respecting the validity of any patent r
37、ights 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 their own responsibility.This standard is subject to revision at a
38、ny 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 should be addressed to ASTM International Headquarters. Your comments w
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