ASTM C942-2010 Standard Test Method for Compressive Strength of Grouts for Preplaced-Aggregate Concrete in the Laboratory《灌浆混凝土用水泥浆抗压强度的实验室标准试验方法》.pdf

1、Designation: C942 10Standard Test Method forCompressive Strength of Grouts for Preplaced-AggregateConcrete in the Laboratory1This standard is issued under the fixed designation C942; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,

2、the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This test method covers

3、the determination of the com-pressive strength of hydraulic cement grout for preplaced-aggregate (PA) concrete.1.2 The values stated in SI units are to be regarded asstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibi

4、lity 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:2C31/C31M Practice for Making and Curing Concrete TestSpecimens in the FieldC109/C109M Test Method

5、 for Compressive Strength ofHydraulic Cement Mortars (Using 2-in. or 50-mm CubeSpecimens)C125 Terminology Relating to Concrete and Concrete Ag-gregatesC219 Terminology Relating to Hydraulic CementC937 Specification for Grout Fluidifier for Preplaced-Aggregate ConcreteC938 Practice for Proportioning

6、Grout Mixtures forPreplaced-Aggregate ConcreteC939 Test Method for Flow of Grout for Preplaced-Aggregate Concrete (Flow Cone Method)3. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method, referto Terminologies C125 and C219.4. Summary of Test Method4.1 Compressive stre

7、ngth of hardened grout is determinedusing top-restrained cubes as defined in Test Method C109/C109M.5. Significance and Use5.1 This test method affords a means for determining thecompressive strength of grouts that expand and, in use, hardenunder conditions of partial to total restraint.5.2 It is pa

8、rticularly applicable for determining the effect oncompressive strength of grout fluidifier to be used with groutfor PA concrete (See Specification C937).6. Apparatus6.1 Scales, masses, sieves, glass graduates, and three-gangmolds, for 2-in. (or 50-mm) cube specimens, baseplates,trowel, and testing

9、machine as specified in Test MethodC109/C109M.6.2 Plates, to cover specimen molds, capable of supportingthe weight or being held down by C-clamps, as described in10.3.6.3 Mass of 7 kg (or 15 lb) or C-clamps, for holding downthe cover plates.7. Temperature and Humidity7.1 Temperature and humidity con

10、ditions for tests per-formed in the laboratory shall be in accordance with TestMethod C109/C109M unless otherwise specified.1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.41 on Hydraulic Cement

11、Grouts.Current edition approved June 15, 2010. Published July 2010. Originallyapproved in 1981. Last previous edition approved in 2004 as C94299(2004)10.1520/C0942-102For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual B

12、ook 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 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.2 Temperatur

13、e and humidity conditions for tests per-formed in the field shall be as prescribed for curing cylindersin Practice C31/C31M.8. Sampling8.1 The test sample shall consist of approximately 1500 mLof grout and shall be representative of the material in the mixer.8.2 Grout proportioned at the mixer from

14、hydraulic ce-ment(s) with or without other materials shall be mixed inaccordance with Specification C937.8.3 Packaged grouts requiring only the addition of water orother fluid shall be mixed in accordance with the manufactur-ers printed recommendations.9. Preparation of Specimen Molds9.1 Prepare the

15、 molds as specified in Test Method C109/C109M.10. Procedure10.1 Determine the consistency of grout as follows:10.1.1 Use the flow cone, Test Method C939, for grout to beused for PA concrete or whenever the consistency is less than35 s.10.1.2 For grouts at consistencies thicker than above, deter-mine

16、 the consistency on the flow table, Test Method C109/C109M, using 5 drops of the table in 3 s. When placing groutin the mold, puddle each layer five times with the gloved finger.10.2 Measure the temperature of the grout.10.3 Mold sets of cube specimens for testing in compres-sion.10.3.1 A three-gang

17、 cube mold shall constitute one test set.Provide at least one test set for each age at which the strengthis to be determined, but not less than two sets.10.3.2 Fill each mold in the set halfway. Puddle each with agloved finger five times to release entrapped air. Fill the moldand puddle again. Bring

18、 the excess grout to the center andfinish the surface by cutting off the excess with the straightedge of a trowel held vertically and drawn across the top of themold with a sawing motion.10.3.3 Place the cover plate over the mold (three-gang),taking care that the grout or loose grains of sand do not

19、 preventseating of the plate.10.3.4 Place a mass of 7 kg (or 15 lb) on each cover plate orfix the cover plates to the molds with C-clamps, fingertightened.11. Storage and Curing11.1 Immediately upon completion of molding:11.1.1 Place laboratory specimens in the moist room andcure in accordance with

20、the applicable portions of Test MethodC109/C109M.11.1.2 Store field specimens and cure in accordance withCuring Cylinders of Practice C31/C31M.11.2 StrippingWith grouts that expand prior to hardening,do not strip molds before age 24 h or final set, whicheveroccurs later.11.2.1 Do not strip molds fro

21、m grouts containing expansive-cement systems before age 3 days.12. Determination of Compressive Strength12.1 Determine the compressive strength at ages 7 and 28days, unless otherwise specified, in accordance with TestMethod C109/C109M.13. Report13.1 The report shall include the following:13.1.1 Iden

22、tification, date of mixing, and whether labora-tory or field tested.13.1.1.1 If field tested, include description of curing proce-dure and temperature.13.1.2 Average compressive strength for each set of groutspecimens to nearest 0.1 MPa (or 10 psi) at 7 and 28 days ofage, unless otherwise specified.

23、14. Precision and Bias14.1 PrecisionThe single-operator coefficient of variationhas been found to be 1.6 %. Therefore, results of two properlyconducted tests by the same operator on the same sample usingproper equipment should not differ from each other by morethan 4.5 % of their average.314.2 BiasN

24、o statement on bias has been made since thereare no standard reference materials.SUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this specification since the last issue, C94299(2004), that may impact the use of this specification. (Approved June 15, 2010)(1) Added

25、new Section 3 Terminology to reference appropriateterminology documents under C01 and C09 and renumberedsubsequent sections.3Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:C08-1014.C942 102ASTM International takes no position re

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27、 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 should be addressed to ASTM Inter

28、national 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 Standards, at the address shown b

29、elow.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/).C942 103