1、Designation: C941 10Standard 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 revis
2、ion, 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 hydrauli
3、c cement groutmixtures for preplaced-aggregate (PA) concrete.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is th
4、eresponsibility 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 Relatin
5、g 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
6、 a grout sample is measured.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 mater
7、ials 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, Specifi
8、cation 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 (30-in. Hg) vacuum.6.1.5 Vacuum Pump or other source of reduced pressure,capable of maintaining a minimum
9、vacuum of 95 kPa (28 in.Hg) on a system 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 (1.0F), for measuringambient and grout temperatures.7. Sampling7.1 The test sample shall consist of at least 500 mL offreshly mi
10、xed grout representative of grout in the mixer. Thetemperature of the laboratory sample of grout shall be 23.0 62.0C (73.5 6 3.5F).8. Procedure8.1 Dampen a single filter paper disk and place it on theperforated plate of the filtering funnel (see Fig. 1). Keep the topof the filtering funnel level. Ap
11、ply to and maintain a minimumvacuum in the system below the stopcock of 95 kPa (28 in. Hg)for the duration of the test. Introduce grout into the funnel untilit is filled flush with the top. Open the stopcock between thefiltering funnel and the graduated cylinder and at the same timestart the stop wa
12、tch. Perform these operations not more than 1min after taking the grout sample from the mixer.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 approve
13、d June 15, 2010. Published July 2010. Originallyapproved in 1981. Last previous edition approved in 2002 as C94102. DOI:10.1520/C0941-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume i
14、nformation, 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.8.2 When 60 mL of water have been removed f
15、rom thesample, stop the stop watch.8.3 When using this method for acceptance testing of agrout fluidifier, take the test sample within 1 min aftercompletion of 3 to 314 min mixing.9. Report9.1 Report the following information:9.1.1 Identification of the grout sample,9.1.2 Required time to extract 60
16、 mL of water from thesample, 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. Therefore, results
17、from two properly conducted tets (by the same operator) on thesame material should not differ by more than 31 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 C
18、HANGESCommittee C09 has identified the location of selected changes to this specification since the last issue,C94102, that may impact the use of this specification. (Approved June 15, 2010)(1) Added new Section 3 Terminology to reference appropriateterminology documents under C01 and C09 and renumb
19、eredsubsequent sections.FIG. 1 Extraction ApparatusC941 102ASTM 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 pat
20、ent 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 reapproved or withdrawn. Your comments are invited eit
21、her 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 you feel that your comments have not received a fair
22、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. 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/).C941 103
