1、Designation: C943 10Standard Practice forMaking Test Cylinders and Prisms for Determining Strengthand Density of Preplaced-Aggregate Concrete in theLaboratory1This standard is issued under the fixed designation C943; the number immediately following the designation indicates the year oforiginal adop
2、tion 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 practice covers procedures for making standard testcylinders used
3、to determine the compressive strength anddensity 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 for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associat
4、ed 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-gregate
5、sC192/C192M Practice for Making and Curing ConcreteTest Specimens in the LaboratoryC219 Terminology Relating to Hydraulic CementC637 Specification for Aggregates for Radiation-ShieldingConcreteC937 Specification for Grout Fluidifier for Preplaced-Aggregate ConcreteC938 Practice for Proportioning Gro
6、ut Mixtures forPreplaced-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 in theLaboratory3. Terminology3.1 Definitions:3.1.1 For definitions of
7、terms used in this test method, referto Terminologies C125 and C219.4. Summary of Practice4.1 Coarse aggregate is placed in a standard cylinder moldhaving end plates to which pipe fittings have been attached.Grout is pumped into the mold until full. The test cylinder,demolded after hardening, may be
8、 cured and used for deter-mination of strength or cut into prisms for the determination ofunit weight.5. Significance and Use5.1 This practice is used for making test cylinders or prismsof PA concrete. Cylinders are used for determining compres-sive strength and approximate density. Prisms, cut from
9、 cylin-ders, eliminate the surface effect and thus more accuratelyrepresent the actual density of PA concrete in place.6. Apparatus6.1 Cylinder Molds (Fig. 1), cast iron or steel, for making150 by 300-mm (6 by 12-in.) cylinders. Base and top platesshall be arranged for tight assembly to the cylinder
10、. All matingand inside surfaces shall be machined smooth such that theassembled mold will be essentially watertight. End plates shallbe drilled and tapped at their centers for standard 19 mm(34-in.) pipe nipples. The top end plate shall also be perforated,as shown in Fig. 2.6.2 Venting Fabric, white
11、 cotton cloth, free of oil andgrease.6.3 Grouting Apparatus (Fig. 3), capable of deliveringgrout at a uniform rate of 1.4 to 2.8 L (0.05 to 0.10 ft3)/min atpressures up to 345 kPa (50 psi).1This practice is under the jurisdiction of ASTM Committee C09 on Concreteand Concrete Aggregates and is the di
12、rect responsibility of Subcommittee C09.41on Hydraulic Cement Grouts.Current edition approved June 15, 2010. Published July 2010. Originallyapproved in 1980. Last previous edition approved in 2002 as C94302. DOI:10.1520/C0943-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, o
13、rcontact ASTM Customer Service 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,
14、 West Conshohocken, PA 19428-2959, United States.6.4 Mallet, with rubber or rawhide head weighing approxi-mately14 kg (12 lb).6.5 Platform Scales, accurate to within 0.3 % of the test loadat any point within the range of use.6.6 Stop Watch, least reading not more than 0.2 s.6.7 Flow ConeSee Test Met
15、hod C939.6.8 Thermometer, accurate to 0.5C (1F), for measuringambient and grout temperatures.7. Materials7.1 Coarse AggregateExcept when tests are made forspecific projects, coarse aggregate shall conform to the require-ments of Specification C637, Table number 2, Coarse Aggre-gate, Grading 1, unles
16、s Grading 2 is specified.7.2 GroutExcept when tests are made for specificprojects, grout ingredients, proportioning, and mixing shall bein accordance with Practice C938.7.3 Tests for Specific ProjectsWhen tests are to be madefor specific projects, materials shall be representative of thosein use or
17、proposed for use in the work.7.3.1 If not taken from project-mixed grout being used inthe work, grout materials shall be mixed in the laboratory usingthe procedure described in Specification C937.8. Sampling8.1 Coarse aggregate shall be representative of materialused or to be used in the work or of
18、that tested and stockpiledfor test work.8.2 Grout to be used in making PA concrete cylinders shallbe typical of the batch from which it is drawn.9. Preparation and Measurement of Prisms9.1 When the determination of unit weight is required,prisms shall be cut from the central portions of the cylinder
19、s todimensions as close as feasible to 101 by 101 by 254 mm (4 by4 by 10 in.). Weigh the specimen to an accuracy of at least 1part in 250. Compute the volume from the averages of twomeasurements of each dimension, taken to the nearest 0.25 mm(0.01 in.).10. Procedure10.1 Temperature:10.1.1 When test
20、cylinders are prepared in the laboratory,bring all materials to and maintain the laboratory in a tempera-ture range of 23.0 6 2.0C (73.5 6 3.5F).10.1.2 When test cylinders are prepared in the field, recordambient temperature in the vicinity of test operation.10.2 Place each cylinder mold upright on
21、its bottom plate ona firm, level surface.10.3 Place the coarse aggregate in the mold in three ap-proximately equal layers. Consolidate each layer by strikingthe mold ten times around its periphery with the mallet. Whenthe mold has been filled, strike off the contents so that noaggregate particle pro
22、jects above the plane of the top of themold.10.4 Place a single layer of venting fabric, in which a holehas been cut to match the 19-mm (34-in.) hole in the top endplate, over the aggregate. Place the top plate on the mold,install bolts, and tighten. Attach the top and bottom valveassemblies and pre
23、pare to connect to hose from grout pump, asshown in Fig. 3.10.5 Measure flow (Test Method C939) and temperature ofthe representative sample of grout. Pour 800 6 10 mL into a1000-mL graduate for observation of expansion and bleeding,Test Method C940.10.6 If grout consistency is satisfactory, charge g
24、rout hopperand pump to waste until all water and diluted grout in the pumpsystem has been expelled. Divert the grout flow to recirculation(to hopper) and make the connection to the bottom of thecylinder mold at valve 3, shown in Fig. 3.10.7 With valves 2, 3, and 4 open, fill the cylinder slowly bypa
25、rtially closing bypass valve 1. When grout flows freelythrough upper plug valve 4, open bypass and close valves 2 and4.Apply 70 to 100 kPa (10 to 15 psi) air pressure on the samplefor 30 6 5 s through air valve 5; then close valve 3. Move thegrout supply line to succeeding cylinders in turn and repe
26、at theabove procedure for each.10.7.1 The total elapsed time for intruding and pressurizinga cylinder mold shall be between 112 and 3 min.10.7.2 Grout, if continually agitated, may be used forintruding PA cylinders for as long as 30 min after originalmixing provided no additional water is added and
27、fluidityremains under 35 s, flow cone, Test Method C939.10.8 After grout expansion is complete, as determined byobservation of the specimen set aside for the purpose, 10.5,remove the upper valve assembly and install a pipe plug in thecenter hole of the upper plate. Using care to avoid jarring thespe
28、cimen, invert the cylinder, remove valve 3 assembly, andinstall a pipe plug in the center hole of the lower plate.Carefully turn the assembly back to its original position. Cleanvalves and fittings immediately upon removal from end plates.FIG. 1 Cylinder Mold Assembly Cross SectionC943 10211. Handli
29、ng and Curing11.1 Do not disturb the specimen after removal of valveassemblies for at least 24 h. Then strip molds and curecylinders in accordance with the section on Curing of PracticeC192/C192M.11.2 Protect field-made specimens during initial storageperiod in the molds from direct sunlight or free
30、zing tempera-tures. When large amounts of pozzolan are used in the groutmixture or in cool curing conditions, delay stripping ofcylinders to avoid damaging the specimens.12. Report12.1 Report the following information:12.1.1 Identification of specimens, date cast, and whetherdone in laboratory or fi
31、eld.12.1.2 Description of fine and coarse aggregate.FIG. 2 End Plate DetailsNOTE 1Grout hose pipe and fittings 25 mm (1 in.) nominal.FIG. 3 Typical Grouting ApparatusC943 10312.1.3 Identification of cementing materials and admixtures.12.1.4 Description of grout including proportions, flow,temperatur
32、e, expansion, and bleeding.12.1.5 Temperatures at which the specimens were made andcured.13. Keywords13.1 cylinders; density; flow cone; grout; grouting appara-tus; preplaced-aggregate; prisms; strengthSUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this practice s
33、ince the last issue, C94302,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 no position respecting the validity of any pate
34、nt 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 responsibility.This standard is subject to revision
35、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 to ASTM International Headquarters. Your comme
36、nts 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 address shown below.This standard is copyrighted
37、 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/).C943 104
