1、Designation: C938 10Standard Practice forProportioning Grout Mixtures for Preplaced-AggregateConcrete1This standard is issued under the fixed designation C938; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisi
2、on. 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 Department of Defense.1. Scope*1.1 This practice describes the laboratory procedur
3、e forselecting proportions for grout mixtures required in the pro-duction of preplaced-aggregate (PA) concrete.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are provided forinformation purposes only.1.3 This standard does not purport to address
4、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 R
5、elating to Concrete and Concrete Ag-gregatesC150 Specification for Portland CementC185 Test Method for Air Content of Hydraulic CementMortarC219 Terminology Relating to Hydraulic CementC618 Specification for Coal Fly Ash and Raw or CalcinedNatural Pozzolan for Use in ConcreteC637 Specification for A
6、ggregates for Radiation-ShieldingConcreteC937 Specification for Grout Fluidifier for Preplaced-Aggregate ConcreteC939 Test Method for Flow of Grout for Preplaced-Aggregate Concrete (Flow Cone Method)C940 Test Method for Expansion and Bleeding of FreshlyMixed Grouts for Preplaced-Aggregate Concrete i
7、n theLaboratoryC941 Test Method for Water Retentivity of Grout Mixturesfor Preplaced-Aggregate Concrete in the LaboratoryC942 Test Method for Compressive Strength of Grouts forPreplaced-Aggregate Concrete in the LaboratoryC943 Practice for Making Test Cylinders and Prisms forDetermining Strength and
8、 Density of Preplaced-AggregateConcrete in the Laboratory3. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method, referto Terminologies C125 and C219.4. Summary of Practice4.1 Grouts at fluid consistency are prepared from one ormore mixtures of cement, pozzolan, fine ag
9、gregate, groutfluidifier, with or without other chemical admixtures, andwater, and tested to determine:4.1.1 The properties of the grout, and4.1.2 The properties of PA concrete made with the groutwhen the grout is intended for such use.4.2 The procedure and equipment required for mixing thisgrout ar
10、e prescribed in this practice.5. Significance and Use5.1 This practice provides a standard procedure for selectingproportions for mixtures of grout to be used at fluid consistencyin the production of PA concrete meeting applicable criteria forstrength, density, and other properties.5.2 This practice
11、 is also useful for determining the compo-sition of grout mixed at fluid consistency and meeting specifiedrequirements for filling voids, cavities, and spaces in rock,foundations, and concrete structures.6. Apparatus6.1 Mixer, constructed as shown in Fig. 1. The three mixerblades shall be made of st
12、eel plate, 3-mm (18-in.) thick, with a100 by 125-mm (4 by 5-in.) elliptical shape. Each blade shallhave two 25 by 75-mm (1 by 3-in.) slots centered on the major1This practice is under the jurisdiction of ASTM Committee C09 on Concreteand Concrete Aggregates and is the direct responsibility of Subcom
13、mittee C09.41on Hydraulic Cement Grouts.Current edition approved June 15, 2010. Published July 2010. Originallyapproved in 1982. Last previous edition approved in 2002 as C93802. DOI:10.1520/C0938-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Servic
14、e at serviceastm.org. For Annual Book of ASTMStandards volume information, 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-
15、2959, United States.axis, and shall be welded to the shaft at an angle of approxi-mately 23 with the horizontal in such a way as to force groutto the bottom of the mixer during rotation. The mixer bladesshall be powered to rotate at approximately 275 r/min underload.6.2 Scales or Balance, accurate t
16、o within 0.3 % of the testmass at any point within range of use.7. Materials7.1 Materials for test purposes, except mixing water, shallmeet the following requirements unless otherwise specified inproject documents:7.1.1 Portland cement, Specification C150, nonair-entraining,7.1.2 Pozzolan, if used,
17、Specification C618,7.1.3 Fluidifier, Specification C937, and7.1.4 Fine aggregate, Specification C637, Table number 2,Grading 1 for specific gravity under 3.0 and Grading 2 forspecific activity 3.0 or heavier.7.2 Where grout is being proportioned for use on a specificproject, materials for test purpo
18、ses shall be from and represen-tative of the same source or type and description as will be usedor is being considered for use on the project.7.3 Mixing water, if clean and potable, is acceptable fornormal test purposes.8. Sampling8.1 Samples of mixed grout for testing shall be representa-tive of th
19、e batch from which they are drawn.8.2 Agitation of the batch shall be continuous until allsamples required from that batch have been drawn.8.3 Grout in the mixer shall not be retempered by theaddition of water. If mixing water is added in increments toadjust fluidity, a new batch shall be prepared f
20、or testing.8.4 Samples shall be drawn for testing in the followingorder: (1) consistency, (2) expansion and bleeding, and (3),other requirements.9. Conditioning9.1 Maintain laboratory at and bring all grout materials to23.0 6 2.0C (73.5 6 3.5F) unless otherwise specified.10. Procedure10.1 Prebatch g
21、rout ingredients by mass to provide a batchvolume after mixing of approximately 0.03 m3(1 ft3).10.2 The first trial mixture, unless otherwise specified, shallcontain equal parts, by mass, of cementitious material and fineaggregate, fluidifier in amount 1 % mass of cementitiousmaterial, unless otherw
22、ise recommended by manufacturer, andsufficient water to produce a flow of 21 6 2 s. The cementitiousmaterial shall consist of two parts of portland cement to onepart of pozzolan by mass.10.3 In subsequent trial mixtures, the proportions of mate-rials shall be varied as needed to satisfy design crite
23、ria.Adjusted mixtures may contain a cementitious ratio of portlandcement to pozzolan other than as stipulated for the first trialmixture.FIG. 1 Grout MixerC938 10210.4 Dampen the inside of the mixer drum, turn the mixeron and charge the ingredients within 2 min in the followingorder: (1) water, (2)
24、fluidifier, (3) pozzolan (if used), (4)portland cement, and (5) fine aggregate. After all materialshave been added, mix for 3 to 314 min.10.5 Determine the following fluid grout properties in theorder shown of each trial mixture:Property Test MethodFlow (time of efflux) C939Expansion and bleeding C9
25、40Water retentivity C941,ifrequiredUnit mass see 10.5.1Other as required10.5.1 Determine the unit mass of the fluid grout using themeasure described in theApparatus section under “Measure” inTest Method C185. Pour the grout into a container, tap the sidelightly five times with a tapping stick as des
26、cribed in TestMethod C185, strike off, then measure mass.10.6 Determine the following hardened grout and PA con-crete properties:Property Test MethodCompressive strength of grout C942Compressive strength of PA concrete C943,ifrequiredUnit mass of grout see 10.6.1Unit mass of PA concrete see 10.6.1,i
27、frequired10.6.1 To determine the unit mass of grout or PA concrete,measure mass of the specimen to an accuracy of at least onepart in 250. Divide the masses by volumes determined asfollows:10.6.1.1 CubesTake two measurements of each dimen-sion to nearest 0.25 mm (0.01 in.). Compute the volume fromav
28、erage measurements.10.6.1.2 PA CylindersTake measurements of two diam-eters at right angles at approximate mid-height. Measure thelength of the cylinder at opposite ends of a diameter. Make allmeasurements to nearest 0.25 mm (0.01 in.). Compute thevolume from average measurements.11. Report11.1 For
29、each mixture, including the final mixture, thefollowing shall be reported:11.1.1 Adescription of all materials used including type andalkali content of portland cement, type of pozzolan, source andname of fluidifier, and sieve analysis and specific gravity offine and coarse aggregate.11.2 For each t
30、rial mixture the following fluid grout prop-erties shall be reported: (1) time of efflux, (2) expansion andfree water, ( 3) water retentivity (if required), (4) and otherspecified data.11.3 For final mixture(s) selected, the report shall includecompressive strength of grout at ages of 7, 28, and 90
31、days, andunit mass unless otherwise required.11.4 For PA concrete cylinders, the report shall includecompressive strengths at ages of 7, 28, and 90 days, and unitmass unless otherwise required.12. Keywords12.1 concrete; grouts; pre-placed aggregateSUMMARY OF CHANGESCommittee C09 has identified the l
32、ocation of selected changes to this practice since the last issue, C93802,that may impact the use of this practice. (Approved June 15, 2010)(1) Added new Section 3 Terminology to reference appropriateterminology documents under C01 and C09 and renumberedsubsequent sections.ASTM International takes n
33、o 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 patent rights, and the riskof infringement of such rights, are entirely their own respon
34、sibility.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 either for revision of this standard or for additional standardsand should be addressed
35、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 hearing you shouldmake your views known to the ASTM Committee on Standards, at the ad
36、dress 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/).C938 103
