1、Designation: C 942 99 (Reapproved 2004)Standard Test Method forCompressive Strength of Grouts for Preplaced-AggregateConcrete in the Laboratory1This standard is issued under the fixed designation C 942; the number immediately following the designation indicates the year oforiginal adoption or, in th
2、e case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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. Scope1.1 This
3、 test method covers 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.
4、 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.2. Referenced Documents2.1 ASTM Standards:2C 31/C 31M Practice for Making and Curing Concrete TestSpecimens in the Field
5、C 109/C 109M Test Method for Compressive Strength ofHydraulic Cement Mortars (Using 2-in. or 50-mm CubeSpecimens)C 937 Specification for Grout Fluidifier for Preplaced-Aggregate ConcreteC 938 Practice for Proportioning Grout Mixtures forPreplaced-Aggregate ConcreteC 939 Test Method for Flow of Grout
6、 for Preplaced-Aggregate Concrete (Flow Cone Method)3. Summary of Test Method3.1 Compressive strength of hardened grout is determinedusing top-restrained cubes as defined in Test Method C 109/C 109M.4. Significance and Use4.1 This test method affords a means for determining thecompressive strength o
7、f grouts that expand and, in use, hardenunder conditions of partial to total restraint.4.2 It is particularly applicable for determining the effect oncompressive strength of grout fluidifier to be used with groutfor PA concrete (See Specification C 937).5. Apparatus5.1 Scales, masses, sieves, glass
8、graduates, and three-gangmolds, for 2-in. (or 50-mm) cube specimens, baseplates,trowel, and testing machine as specified in Test MethodC 109/C 109M.5.2 Plates, to cover specimen molds, capable of supportingthe weight or being held down by C-clamps, as described in9.3.5.3 Mass of 7 kg (or 15 lb) or C
9、-clamps, for holding downthe cover plates.6. Temperature and Humidity6.1 Temperature and humidity conditions for tests per-formed in the laboratory shall be in accordance with TestMethod C 109/C 109M unless otherwise specified.6.2 Temperature and humidity conditions for tests per-formed in the field
10、 shall be as prescribed for curing cylindersin Practice C 31/C 31M.7. Sampling7.1 The test sample shall consist of approximately 1500 mLof grout and shall be representative of the material in the mixer.7.2 Grout proportioned at the mixer from hydraulic ce-ment(s) with or without other materials shal
11、l be mixed inaccordance with Specification C 937.7.3 Packaged grouts requiring only the addition of water orother fluid shall be mixed in accordance with the manufactur-ers printed recommendations.1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates an
12、d is the direct responsibility of SubcommitteeC09.41 on Concrete for Radiation Shielding.Current edition approved Jan. 10, 1999. Published March 1999. Originallyapproved in 1981. Last previous edition approved in 1998 as C 942 98a.2For referenced ASTM standards, visit the ASTM website, www.astm.org,
13、 orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8. Preparation
14、of Specimen Molds8.1 Prepare the molds as specified in Test Method C 109/C 109M.9. Procedure9.1 Determine the consistency of grout as follows:9.1.1 Use the flow cone, Test Method C 939, for grout to beused for PA concrete or whenever the consistency is less than35 s.9.1.2 For grouts at consistencies
15、 thicker than above, deter-mine the consistency on the flow table, Test Method C 109/C 109M, using 5 drops of the table in 3 s. When placing groutin the mold, puddle each layer five times with the gloved finger.9.2 Measure the temperature of the grout.9.3 Mold sets of cube specimens for testing in c
16、ompression.9.3.1 A three-gang 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.9.3.2 Fill each mold in the set halfway. Puddle each with agloved finger five times to release entrapped air. Fill the
17、 moldand puddle again. Bring 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.9.3.3 Place the cover plate over the mold (three-gang),taking care that the grout or
18、loose grains of sand do not preventseating of the plate.9.3.4 Place a mass of 7 kg (or 15 lb) on each cover plate orfix the cover plates to the molds with C-clamps, fingertightened.10. Storage and Curing10.1 Immediately upon completion of molding:10.1.1 Place laboratory specimens in the moist room a
19、ndcure in accordance with the applicable portions of Test MethodC 109/C 109M.10.1.2 Store field specimens and cure in accordance withCuring Cylinders of Practice C 31/ 31M.10.2 StrippingWith grouts that expand prior to hardening,do not strip molds before age 24 h or final set, whicheveroccurs later.
20、10.2.1 Do not strip molds from grouts containingexpansive-cement systems before age 3 days.11. Determination of Compressive Strength11.1 Determine the compressive strength at ages 7 and 28days, unless otherwise specified, in accordance with TestMethod C 109/C 109M.12. Report12.1 The report shall inc
21、lude the following:12.1.1 Identification, date of mixing, and whether labora-tory or field tested.12.1.1.1 If field tested, include description of curing proce-dure and temperature.12.1.2 Average compressive strength for each set of groutspecimens to nearest 0.1 MPa (or 10 psi) at 7 and 28 days ofag
22、e, unless otherwise specified.13. Precision and Bias13.1 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
23、% of their average.313.2 BiasNo statement on bias has been made since thereare no standard reference materials.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 advise
24、d 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 revised, either re
25、approved 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 may attend. If y
26、ou 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. Individua
27、l 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).3The precision data are based on testing results available from ASTM. RequestRR: C08-1014.C 942 99 (2004)2
