ASTM_C_942_-_15.pdf

Designation:C94215Standard 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,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 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.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:2C31/C31M Practice for Making and Curing Concrete TestSpecimens in the FieldC109/C109M Test Method 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 Grout Mixtures forPreplaced-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,referto Terminologies C125 and C219.4.Summary of Test Method4.1 Compressive strength 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 particularly 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 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 conditions for tests per-formed in the laboratory shall be in accordance with TestMethod C109/C109M unless otherwise specified.7.2 Temperature 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.1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregatesand is the direct responsibility of SubcommitteeC09.41 on Hydraulic Cement Grouts.Current edition approved Aug.1,2015.Published October 2015.Originallyapproved in 1981.Last previous edition approved in 2010 as C94210.DOI:10.1520/C0942-152For referenced ASTM standards,visit the 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.*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 States1 8.2 Grout proportioned at the mixer from 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 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 the consistency on the flow table,Test Method C1437,using 5 drops of the table in 3 s.When placing grout in themold,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 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