ASTM D5971-2007 809 Standard Practice for Sampling Freshly Mixed Controlled Low-Strength Material《新拌受控低强度材料抽样用标准实施规程》.pdf

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1、Designation: D 5971 07Standard 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 of freshly mixed controlled low-strengthmaterial (CLSM

3、) as delivered to the project site on which testsare to be performed to determine compliance with qualityrequirements of the specifications under which the CLSM isfurnished (Note 1). This practice includes sampling fromrevolving-drum truck mixers and from agitating equipmentused to transport central

4、-mixed CLSM. This Practice is basedon Practice C 172 for concrete.1.2 The values stated in SI units are to be regarded as thestandard. The inch-pound equivalents are shown for informa-tion only.NOTE 1Composite samples are required by this practice unlessspecifically excepted by procedures governing

5、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. It is recommended that random sampling be used to determineoverall specification compliance.1.3 This standard doe

6、s 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 practices and determine the applica-bility of regulatory limitations prior to use. (Warning: Freshhydraulic cementitio

7、us mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure.2)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 judgem

8、ent. Not all aspects 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 man

9、y unique aspects. 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:3C 172 Practice for Sampling Freshly Mixed ConcreteD 653 Terminology Relating to Soil, Rock, and ContainedFlu

10、idsD 3740 Practice for Minimum Requirements for AgenciesEngaged in the Testing and/or Inspection of Soil and Rockas Used in Engineering Design and ConstructionD 4832 Test Method for Preparation and Testing of Con-trolled Low Strength Material (CLSM) Test CylindersD 6023 Test Method for Unit Weight,

11、Yield, Cement Con-tent, and Air Content (Gravimetric) of Controlled LowStrength Material (CLSM)D 6103 Test Method for Flow Consistency of ControlledLow Strength Material (CLSM)3. Terminology3.1 Definitions: For common definitions of terms in thisstandard, refer to Terminology D 653.3.2 Definitions o

12、f Terms Specific to This Standard:3.2.1 composite sample, na sample that is constructed 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 P

13、ortland cement, fly ash, aggregates, water, andpossibly chemical admixtures that, as 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 nati

14、ve soil. Depending on the amount of water usedin the CLSM mixture, it can be placed as a non-flowablecompacted material or as a mortar.1This practice is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.15 on Stabilization WithAdmixture

15、s.Current edition approved Nov. 1, 2007. Published December 2007. Originallyapproved in 1995. Last previous edition approved in 2001 as D 5971 01.2Section on Safety Precautions, Manual of Aggregate and Concrete Testing,Annual Book of ASTM Standards, Vol. 04.02.3For referenced ASTM standards, visit t

16、he 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.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100

17、 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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

18、for the purpose of testing variousproperties. 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 th

19、e competence of the personnel performing it and thesuitability of the equipment and facilities used. Agencies that meet thecriteria of Practice D 3740 are generally considered capable of competentand objective testing/sampling/inspection/ and the like. Users of thisstandard are cautioned that compli

20、ance with Practice D 3740 does not initself assure reliable results. Reliable results depend on many factors.Practice D 3740 provides a means of evaluating some of these factors.5. Apparatus5.1 Hand ToolsShovels, hand scoops, and rubber glovesas required.5.2 ReceptacleA container of suitable size ha

21、ving a non-absorbent surface.6. Sampling6.1 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 thetest and to ensure a representative sample of the batch wastaken.6.2 The procedure

22、s used in sampling shall include the use ofevery precaution that will assist in obtaining samples that aretruly representative of the nature and condition of CLSMsampled as outlined in 7.1.7. Procedure7.1 Sampling from Revolving-Drum Truck Mixers orAgitatorsSample the CLSM by collecting two or morep

23、ortions taken at regularly spaced intervals during discharge ofthe middle portion of the batch (Note 3). These samples shallbe obtained within the time limit specified in 7.2 and compos-ited into one sample for test purposes. In any case do not obtainsamples until after all water has been added to t

24、he mixer; alsodo not obtain samples from the very first or last portions of thebatch discharge (Note 4). Sample by repeatedly passing areceptacle through the entire discharge stream or by completelydiverting the discharge into a sample container. Regulate therate of discharge of the batch by the rat

25、e of revolution of thedrum and not by the size of the gate opening.NOTE 3Sampling normally should be performed on the CLSM asdelivered from the truck to the job site excavation.NOTE 4No samples should be taken before 10 % or after 90 % of thebatch has been discharged. Due to the difficulty of determ

26、ining the actualquantity of CLSM discharged, the intent is to provide samples that arerepresentative of widely separated portions, but not the beginning and theend of the load.7.2 The elapsed time between obtaining the first and finalportions of the composite sample shall be as short as possibleand

27、in no instance shall it exceed 2 min.7.3 Transport the composite samples to the place wherefresh CLSM tests are to be performed or where test specimensare to be molded. The composite sample shall be combined andremixed with a shovel or scoop the minimum amount neces-sary to ensure uniformity and com

28、pliance with the minimumtime limits specified in 7.4.7.4 Start tests for flow consistency (Test Method D 6103),density (unit weight), and air content (Test Method D 6023)within 5 min after obtaining the final portion of the compositesample. Complete these tests as expeditiously as possible. Startmol

29、ding specimens for strength tests (Test Method D 4832)within 10 min after obtaining the final portion of the compositesample. Keep the elapsed time between obtaining and using thesample as short as possible and protect the sample from thesun, wind, and other sources of rapid evaporation, and fromcon

30、tamination.8. Keywords8.1 air content; CLSM; composite sample; density; flowconsistency; quality control; sampling; unit weightSUMMARY OF CHANGESCommittee D18 has identified the location of selected changes to this standard since the last issue(D 5971 01) that may impact the use of this standard. (A

31、pproved November 1, 2007.)(1) Revised Section 1.1 for clarity.(2) Made an addition to 1.3 safety caveat.(3) Added new footnote 2 referencing addition to safetycaveat.(4) Added new Section 5 on Apparatus and renumberedsubsequent sections.(5) Added Section 6.2.(6) Revised Section 7.1 for clarity and a

32、lso added Note 4.(7) Replaced “unit weight” with “density” in Section 7.4.(8) Added “sample” and “density” to Section 8.D5971072ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are

33、 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 every five years andif not r

34、evised, 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 technical committee, which you

35、 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).D5971073