ASTM_C_941_-_16.pdf

Designation:C94116Standard Test Method forWater Retentivity of Grout Mixtures for Preplaced-AggregateConcrete in the Laboratory1This standard is issued under the fixed designation C941;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.1.Scope*1.1 This test method covers the procedure for determiningthe water retentivity of freshly mixed hydraulic cement groutmixtures for preplaced-aggregate(PA)concrete.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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:2C125 Terminology Relating to Concrete and Concrete Ag-gregatesC219 Terminology Relating to Hydraulic CementE832 Specification for Laboratory Filter Papers3.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 The time required for the extraction of a standardamount of water by vacuum from a grout specimen is mea-sured.5.Significance and Use5.1 This test method measures the ability of a grout mixtureto retain its mixing water.5.2 It is used for qualifying grout fluidifiers to be used in theproduction of PA concrete.5.3 It may be used to compare the effects of variousadmixtures or materials combinations on the water retentivityproperties of any cement-water grout.6.Apparatus6.1 Extraction Apparatus,assembled as in Fig.1,includingthe following:6.1.1 Funnel,porcelain Bchner filtering,111 mm insidediameter at the perforated plate and 500 mL in volume.6.1.2 Filter Paper,Specification E832,Type 2,Class G,disk,11-cm diameter filter paper.6.1.3 Graduated Cylinder,250 mL cut down to about 130mL.6.1.4 Vacuum Gage or manometer graduated in incrementsof 1 kPa to 100 kPa vacuum.6.1.5 Vacuum Pump or other source of reduced pressure,capable of maintaining a minimum vacuum of 95 kPa on asystem having a volume of not less than 1 L.6.2 Stop Watch,having a least reading of not more than 0.2s.6.3 Thermometer,accurate to 0.5C,for measuring ambientand grout temperatures.7.Sampling7.1 The test sample shall consist of at least 500 mL offreshly mixed grout representative of grout in the mixer.Bringthe temperature of the laboratory sample of grout to 23.0 62.0C and record the tempature.7.2 Maintain the ambient temperature of the room in whichthe test is performed at 23.0 6 2C and record the temperature.8.Procedure8.1 Place a wetted filter paper on the perforated plate of thefiltering funnel(see Fig.1).Keep the top of the filtering funnellevel.Apply and maintain a vacuum of at least 95 kPa in thesystem below the stopcock for the duration of the test.Introduce grout into the funnel until it is filled flush with thetop.Open the stopcock between the filtering funnel and thegraduated cylinder and at the same time start the stop watch.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 Grouts.Current edition approved Feb.1,2016.Published April 2016.Originallyapproved in 1981.Last previous edition approved in 2010 as C94110.DOI:10.1520/C0941-16.2For 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 Perform these operations not more than 1 min after taking thegrout sample from the mixer.8.2 When 60 mL of water have been removed from thespecimen,stop the stop watch.8.3 If using this method for acceptance testing of a groutfluidifier,take the test sample within 1 min after completion of3 to 314min mixing.9.Report9.1 Report the following information:9.1.1 Identification of the grout specimen,9.1.2 Measured time to extract 60 mL of water from thespecimen,to the nearest 1 s,9.1.3 Temperature of the grout sample at the beginning ofthe test,and9.1.4 Ambient temperature during the test.10.Precision and Bias10.1 PrecisionThe single laboratory,three operators stan-dard deviation has been found to be 11 s.10.2 BiasNo statement on bias can be prepared becausethere are no standard reference materials.11.Keywords11.1 grout fluidifier;preplaced-aggregate concrete;waterretentivitySUMMARY OF CHANGESCommittee C09 has identi