ASTM C943-2002 Standard Practice for Making Test Cylinders and Prisms for Determining Strength and Density of Preplaced-Aggregate Concrete in the Laboratory《在实验室内进行预置集料混凝土的密度和强度试验用.pdf

1、Designation: C 943 02Standard Practice forMaking Test Cylinders and Prisms for Determining Strengthand Density of Preplaced-Aggregate Concrete in theLaboratory1This standard is issued under the fixed designation C 943; the number immediately following the designation indicates the year oforiginal ad

2、option or, in the case of revision, 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 practice covers procedures for making standard testcylinders use

3、d 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, associ

4、ated 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:C 192/C 192M Practice for Making and Curing ConcreteTest Spe

5、cimens in the Laboratory2C 637 Specification for Aggregates for Radiation-ShieldingConcrete2C 937 Specification for Grout Fluidifier for Preplaced-Aggregate Concrete2C 938 Practice for Proportioning Grout Mixtures forPreplaced-Aggregate Concrete2C 939 Test Method for Flow of Grout for Preplaced-Aggr

6、egate Concrete (Flow Cone Method)2C 940 Test Method for Expansion and Bleeding of FreshlyMixed Grouts for Preplaced-Aggregate Concrete in theLaboratory23. Summary of Practice3.1 Coarse aggregate is placed in a standard cylinder moldhaving end plates to which pipe fittings have been attached.Grout is

7、 pumped into the mold until full. The test cylinder,demolded after hardening, may be cured and used for deter-mination of strength or cut into prisms for the determination ofunit weight.4. Significance and Use4.1 This practice is used for making test cylinders or prismsof PA concrete. Cylinders are

8、used for determining compres-sive strength and approximate density. Prisms, cut from cylin-ders, eliminate the surface effect and thus more accuratelyrepresent the actual density of PA concrete in place.5. Apparatus5.1 Cylinder Molds (Fig. 1), cast iron or steel, for making150 by 300-mm (6 by 12-in.

9、) cylinders. Base and top platesshall be arranged for tight assembly to the cylinder. 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

10、 top end plate shall also be perforated,as shown in Fig. 2.5.2 Venting Fabric, white cotton cloth, free of oil andgrease.5.3 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).5.4 Mallet, with rubber or

11、rawhide head weighing approxi-mately14 kg (12 lb).5.5 Platform Scales, accurate to within 0.3 % of the test loadat any point within the range of use.5.6 Stop Watch, least reading not more than 0.2 s.5.7 Flow ConeSee Test Method C 939.5.8 Thermometer, accurate to 0.5C (1F), for measuringambient and g

12、rout temperatures.6. Materials6.1 Coarse AggregateExcept when tests are made forspecific projects, coarse aggregate shall conform to the require-ments of Specification C 637, Table number 2, Coarse Aggre-gate, Grading 1, unless Grading 2 is specified.1This practice is under the jurisdiction of ASTM

13、Committee C09 on Concreteand Concrete Aggregates and is the direct responsibility of SubcommitteeC09.41 on Concrete for Radiation Shielding.Current edition approved Dec. 10, 2002. Published February 2003. Originallyapproved in 1980. Last previous edition approved in 1996 as C 94396.2Annual Book of A

14、STM Standards, Vol 04.02.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 GroutExcept when tests are made for specificprojects, grout ingredients, proportioning, and mixing shall bein accordance with Practice C 938.6.3 Tests for S

15、pecific ProjectsWhen tests are to be madefor specific projects, materials shall be representative of thosein use or proposed for use in the work.6.3.1 If not taken from project-mixed grout being used inthe work, grout materials shall be mixed in the laboratory usingthe procedure described in Specifi

16、cation C 937.7. Sampling7.1 Coarse aggregate shall be representative of materialused or to be used in the work or of that tested and stockpiledfor test work.7.2 Grout to be used in making PA concrete cylinders shallbe typical of the batch from which it is drawn.8. Preparation and Measurement of Pris

17、ms8.1 When the determination of unit weight is required,prisms shall be cut from the central portions of the cylinders 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 twom

18、easurements of each dimension, taken to the nearest 0.25 mm(0.01 in.).9. Procedure9.1 Temperature:9.1.1 When test 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).9.1.2 When test cylinders are prepared in

19、 the field, recordambient temperature in the vicinity of test operation.9.2 Place each cylinder mold upright on its bottom plate ona firm, level surface.9.3 Place the coarse aggregate in the mold in three approxi-mately equal layers. Consolidate each layer by striking themold ten times around its pe

20、riphery with the mallet. When themold has been filled, strike off the contents so that no aggregateparticle projects above the plane of the top of the mold.9.4 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

21、. Place the top plate on the mold,install bolts, and tighten. Attach the top and bottom valveassemblies and prepare to connect to hose from grout pump, asshown in Fig. 3.9.5 Measure flow (Test Method C 939) and temperature ofthe representative sample of grout. Pour 800 6 10 mL into a1000-mL graduate

22、 for observation of expansion and bleeding,Test Method C 940.9.6 If grout consistency is satisfactory, charge grout 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 o

23、f thecylinder mold at valve 3, shown in Fig. 3.9.7 With valves 2, 3, and 4 open, fill the cylinder slowly bypartially 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

24、5 s through air valve 5; then close valve 3. Move thegrout supply line to succeeding cylinders in turn and repeat theabove procedure for each.9.7.1 The total elapsed time for intruding and pressurizing acylinder mold shall be between 112 and 3 min.9.7.2 Grout, if continually agitated, may be used fo

25、r intrud-ing PA cylinders for as long as 30 min after original mixingprovided no additional water is added and fluidity remainsunder 35 s, flow cone, Test Method C 939.9.8 After grout expansion is complete, as determined byobservation of the specimen set aside for the purpose, 9.5,remove the upper v

26、alve assembly and install a pipe plug in thecenter hole of the upper plate. Using care to avoid jarring thespecimen, 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 f

27、ittings immediately upon removal from end plates.10. Handling and Curing10.1 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 PracticeC 192/C 192M.10.2 Protect field-made specimens during in

28、itial storageperiod in the molds from direct sunlight or freezing 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.11. Report11.1 Report the following information:11.1.1 Identification

29、 of specimens, date cast, and whetherdone in laboratory or field.FIG. 1 Cylinder Mold Assembly Cross SectionC94302211.1.2 Description of fine and coarse aggregate.11.1.3 Identification of cementing materials and admixtures.11.1.4 Description of grout including proportions, flow,temperature, expansio

30、n, and bleeding.11.1.5 Temperatures at which the specimens were made andcured.12. Keywords12.1 cylinders; density; flow cone; grout; grouting appara-tus; preplaced-aggregate; prisms; strengthFIG. 2 End Plate DetailsNOTE 1Grout hose pipe and fittings 25 mm (1 in.) nominal.FIG. 3 Typical Grouting Appa

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34、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).C943024