ASTM C942-2015 Standard Test Method for Compressive Strength of Grouts for Preplaced-Aggregate Concrete in the Laboratory《在实验室内测定预置集料混凝土的压缩强度的标准试验方法》.pdf

1、Designation: C942 10C942 15Standard 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 rev

2、ision, 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 U.S. Department of Defense.1. Scope*1.1 This test me

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

4、he responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C31/C31M Practice for Making and Curing Concrete Test Specimens in the FieldC109/C109M T

5、est Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube Specimens)C125 Terminology Relating to Concrete and Concrete AggregatesC219 Terminology Relating to Hydraulic CementC937 Specification for Grout Fluidifier for Preplaced-Aggregate ConcreteC938 Practice for Pro

6、portioning Grout Mixtures for Preplaced-Aggregate ConcreteC939 Test Method for Flow of Grout for Preplaced-Aggregate Concrete (Flow Cone Method)C1437 Test Method for Flow of Hydraulic Cement Mortar3. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method, refer to Termino

7、logies C125 and C219.4. Summary of Test Method4.1 Compressive strength of hardened grout is determined using top-restrained cubes as defined in Test Method C109/C109M.5. Significance and Use5.1 This test method affords a means for determining the compressive strength of grouts that expand and, in us

8、e, harden underconditions of partial to total restraint.5.2 It is particularly applicable for determining the effect on compressive strength of grout fluidifier to be used with grout forPA concrete (See Specification C937).6. Apparatus6.1 Scales, masses, sieves, glass graduates, and three-gang molds

9、, for 2-in. (or 50-mm) cube specimens, baseplates, trowel, andtesting machine as specified in Test Method C109/C109M.1 This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregatesand is the direct responsibility of Subcommittee C09.41 onHydraulic Cement Grouts

10、.Current edition approved June 15, 2010Aug. 1, 2015. Published July 2010October 2015. Originally approved in 1981. Last previous edition approved in 20042010 asC94299(2004)C942 10.1520/C0942-1010. DOI: 10.1520/C0942-152 For referencedASTM standards, visit theASTM website, www.astm.org, or contactAST

11、M Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made

12、 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 published by ASTM is to be considered the official document.*A Su

13、mmary 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 States16.2 Plates, to cover specimen molds, capable of supporting the weight or being held down by C-clamps, as described in 10.3.6.3

14、 Mass of 7 kg (or 15 lb) or C-clamps, for holding down the cover plates.7. Temperature and Humidity7.1 Temperature and humidity conditions for tests performed in the laboratory shall be in accordance with Test MethodC109/C109M unless otherwise specified.7.2 Temperature and humidity conditions for te

15、sts performed in the field shall be as prescribed for curing cylinders in PracticeC31/C31M.8. Sampling8.1 The test sample shall consist of approximately 1500 mL of grout and shall be representative of the material in the mixer.8.2 Grout proportioned at the mixer from hydraulic cement(s) with or with

16、out other materials shall be mixed in accordance withSpecification C937.8.3 Packaged grouts requiring only the addition of water or other fluid shall be mixed in accordance with the manufacturersprinted recommendations.9. Preparation of Specimen Molds9.1 Prepare the molds as specified in Test Method

17、 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 be used for PA concrete or whenever the consistency is less than 35s.10.1.2 For grouts at consistencies thicker than above, determine the consistency on the flow table

18、, Test Method C109/C109MC1437, using 5 drops of the table in 3 s. When placing grout in the mold, puddle each layer five times with the glovedfinger.10.2 Measure the temperature of the grout.10.3 Mold sets of cube specimens for testing in compression.10.3.1 A three-gang cube mold shall constitute on

19、e test set. Provide at least one test set for each age at which the strength isto be determined, but not less than two sets.10.3.2 Fill each mold in the set halfway. Puddle each with a gloved finger five times to release entrapped air. Fill the mold andpuddle again. Bring the excess grout to the cen

20、ter and finish the surface by cutting off the excess with the straight edge of a trowelheld vertically and drawn across the top of the mold 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 prevent seatingof the pl

21、ate.10.3.4 Place a mass of 7 kg (or 15 lb) on each cover plate or fix the cover plates to the molds with C-clamps, finger tightened.11. Storage and Curing11.1 Immediately upon completion of molding:11.1.1 Place laboratory specimens in the moist room and cure in accordance with the applicable portion

22、s of Test MethodC109/C109M.11.1.2 Store field specimens and cure in accordance with Curing 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, whichever occurslater.11.2.1 Do not strip molds from grouts containing

23、expansive-cement systems before age 3 days.12. Determination of Compressive Strength12.1 Determine the compressive strength at ages 7 and 28 days, unless otherwise specified, in accordance with Test MethodC109/C109M.13. Report13.1 The report shall include the following:13.1.1 Identification, date of

24、 mixing, and whether laboratory or field tested.13.1.1.1 If field tested, include description of curing procedure and temperature.13.1.2 Average compressive strength for each set of grout specimens to nearest 0.1 MPa (or 10 psi) at 7 and 28 days of age,unless otherwise specified.C942 15214. Precisio

25、n and Bias14.1 PrecisionThe single-operator coefficient of variation has been found to be 1.6 %. Therefore, results of two properlyconducted tests by the same operator on the same sample using proper equipment should not differ from each other by more than4.5 % of their average.314.2 BiasNo statemen

26、t on bias has been made since there are no standard reference materials.SUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this specification since the last issue, C94299(2004),10), that may impact the use of this specification. (Approved Aug. 1, 2015June 15, 2010)(1)

27、 Added new Section 3 Terminology to reference appropriate terminology documents under C01 and C09 and renumberedsubsequent sections.3 Supporting data have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:C08-1014.C942 153(1) Replaced reference to Tes

28、t Method C109/C109M with Test Method C1437 in 10.1.2.ASTM 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 expressly advised that determination of the validity of any such patent ri

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