1、Designation: C 941 02Standard Test Method forWater Retentivity of Grout Mixtures for Preplaced-AggregateConcrete in the Laboratory1This standard is issued under the fixed designation C 941; 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the procedure for determiningthe water retentivity of freshly mixed hydrau
3、lic 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
4、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:E 832 Specification for Laboratory Filter Papers23. Summary of Test Method3.1 The tim
5、e required for the extraction of a standardamount of water by vacuum from a grout sample is measured.4. Significance and Use4.1 This test method measures the ability of a grout mixtureto retain its mixing water.4.2 It is used for qualifying grout fluidifiers to be used in theproduction of PA concret
6、e.4.3 It may be used to compare the effects of variousadmixtures or materials combinations on the water retentivityproperties of any cement-water grout.5. Apparatus5.1 Extraction Apparatus, assembled as in Fig. 1, includingthe following:5.1.1 Funnel, porcelain Bchner filtering, 111 mm insidediameter
7、 at the perforated plate and 500 mL in volume.5.1.2 Filter Paper, Specification E 832, Type 2, Class G,disk, 11-cm diameter filter paper.5.1.3 Graduated Cylinder, 250 mL cut down to about 130mL.5.1.4 Vacuum Gage or manometer graduated in incrementsof 1 kPa to 100 kPa (30-in. Hg) vacuum.5.1.5 Vacuum
8、Pump or other source of reduced pressure,capable of maintaining a minimum vacuum of 95 kPa (28 in.Hg) on a system having a volume of not less than 1 L.5.2 Stop Watch, having a least reading of not more than 0.2s.5.3 Thermometer, accurate to 0.5C (1.0F), for measuringambient and grout temperatures.6.
9、 Sampling6.1 The test sample shall consist of at least 500 mL offreshly mixed 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).7. Procedure7.1 Dampen a single filter paper disk and place it on theperforated plate of the fi
10、ltering funnel (see Fig. 1). Keep the topof the filtering funnel level. Apply 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 thefilteri
11、ng funnel and the graduated cylinder and at the same timestart the stop watch. Perform these operations not more than 1min after taking the grout sample from the mixer.7.2 When 60 mL of water have been removed from thesample, stop the stop watch.7.3 When using this method for acceptance testing of a
12、grout fluidifier, take the test sample within 1 min aftercompletion of 3 to 314 min mixing.8. Report8.1 Report the following information:8.1.1 Identification of the grout sample,8.1.2 Required time to extract 60 mL of water from thesample, to the nearest 1 s,1This test method is under the jurisdicti
13、on of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.41on Concrete for Radiation Shielding.Current edition approved Dec. 10, 2002. Published February 2003. Originallyapproved in 1981. Last previous edition approved in 1996 as C 94196.2Annual
14、 Book of ASTM Standards, Vol 14.02.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8.1.3 Temperature of the grout sample at the beginning ofthe test, and8.1.4 Ambient temperature during the test.9. Precision and Bias9.1 PrecisionThe
15、single laboratory, three operators stan-dard deviation has been found to be 11 s. Therefore, resultsfrom two properly conducted tets (by the same operator) on thesame material should not differ by more than 31 s.9.2 BiasNo statement on bias can be prepared becausethere are no standard reference mate
16、rials.10. Keywords10.1 grout fluidifier; preplaced-aggregate concrete; waterretentivityASTM 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
17、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 reapproved or withdrawn. Y
18、our 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 you feel that your commen
19、ts 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. 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).FIG. 1 Extraction ApparatusC941022
