1、Designation: C943 10C943 17Standard 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 oforigin
2、al adoption 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 test cylinde
3、rs used to determine the compressive strength and densityof preplaced-aggregate (PA) concrete.1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.3 This standard does not purport to address all of the safety concerns, if an
4、y, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use.WarningFresh hydraulic cementitious mixtures are caustic and may ca
5、usechemical burns to skin and tissue upon prolonged exposure.21.4 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations
6、issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3C125 Terminology Relating to Concrete and Concrete AggregatesC192/C192M Practice for Making and Curing Concrete Test Specimens in the LaboratoryC219 Terminology Relating to Hy
7、draulic CementC637 Specification for Aggregates for Radiation-Shielding ConcreteC937 Specification for Grout Fluidifier for Preplaced-Aggregate ConcreteC938 Practice for Proportioning Grout Mixtures for Preplaced-Aggregate ConcreteC939C939/C939M Test Method for Flow of Grout for Preplaced-Aggregate
8、Concrete (Flow Cone Method)C940 Test Method for Expansion and Bleeding of Freshly Mixed Grouts for Preplaced-Aggregate Concrete in the Laboratory3. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method, refer to Terminologies C125 and C219.4. Summary of Practice4.1 Coars
9、e aggregate is placed in a standard cylinder mold having end plates to which pipe fittings have been attached. Groutis pumped into the mold until full.The test cylinder, demolded after hardening, may be cured and used for determination of strengthor cut into prisms for the determination of unit weig
10、ht.1 This practice is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.41 onHydraulic Cement Grouts.Current edition approved June 15, 2010Dec. 15, 2017. Published July 2010January 2018. Originally approved in 1980.
11、Last previous edition approved in 20022010 asC943 02.10. DOI: 10.1520/C0943-10.10.1520/C0943-17.2 Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, Vol. 04.02.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Cus
12、tomer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to t
13、he previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary
14、 of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15. Significance and Use5.1 This practice is used for making test cylinders or prisms of PA concrete. Cylinders are used for determi
15、ning compressivestrength and approximate density. Prisms, cut from cylinders, eliminate the surface effect and thus more accurately represent theactual density of PA concrete in place.6. Apparatus6.1 Cylinder Molds (Fig. 1), cast iron or steel, for making 150 by 300-mm (6 by 12-in.) cylinders. Base
16、and top plates shall bearranged for tight assembly to the cylinder.All mating and inside surfaces shall be machined smooth such that the assembled moldwill be essentially watertight. End plates shall be drilled and tapped at their centers for standard 19 mm (34-in.) pipe nipples. Thetop end plate sh
17、all also be perforated, as shown in Fig. 2.6.2 Venting Fabric, white cotton cloth, free of oil and grease.6.3 Grouting Apparatus (Fig. 3), capable of delivering grout at a uniform rate of 1.4 to 2.8 L (0.05 to 0.10 ft3)/min at pressuresup to 345 kPa (50 psi).6.4 Mallet, with rubber or rawhide head w
18、eighing approximately 14 kg (12 lb).6.5 Platform Scales, accurate to within 0.3 % of the test load at any point within the range of use.6.6 Stop Watch, least reading not more than 0.2 s.6.7 Flow ConeSee Test Method C939C939/C939M.6.8 Thermometer, accurate to 0.5C (1F), for measuring ambient and grou
19、t temperatures.7. Materials7.1 Coarse AggregateExcept when tests are made for specific projects, coarse aggregate shall conform to the requirementsof Specification C637, Table number 2, Coarse Aggregate, Grading 1, unless Grading 2 is specified.7.2 GroutExcept when tests are made for specific projec
20、ts, grout ingredients, proportioning, and mixing shall be in accordancewith Practice C938.7.3 Tests for Specific ProjectsWhen tests are to be made for specific projects, materials shall be representative of those in useor proposed for use in the work.7.3.1 If not taken from project-mixed grout being
21、 used in the work, grout materials shall be mixed in the laboratory using theprocedure described in Specification C937.FIG. 1 Cylinder Mold Assembly Cross SectionC943 1728. Sampling8.1 Coarse aggregate shall be representative of material used or to be used in the work or of that tested and stockpile
22、d for testwork.8.2 Grout to be used in making PA concrete cylinders shall be typical of the batch from which it is drawn.FIG. 2 End Plate DetailsNOTE 1Grout hose pipe and fittings 25 mm (1 in.) nominal.FIG. 3 Typical Grouting ApparatusC943 1739. Preparation and Measurement of Prisms9.1 When the dete
23、rmination 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 by 4 by 10 in.). Weigh the specimen to an accuracy of at least 1 partin 250. Compute the volume from the averages of two measurements of e
24、ach dimension, taken to the nearest 0.25 mm (0.01 in.).10. Procedure10.1 Temperature:10.1.1 When test cylinders are prepared in the laboratory, bring all materials to and maintain the laboratory in a temperaturerange of 23.0 6 2.0C (73.5 6 3.5F).10.1.2 When test cylinders are prepared in the field,
25、record ambient temperature in the vicinity of test operation.10.2 Place each cylinder mold upright on its bottom plate on a firm, level surface.10.3 Place the coarse aggregate in the mold in three approximately equal layers. Consolidate each layer by striking the moldten times around its periphery w
26、ith the mallet. When the mold has been filled, strike off the contents so that no aggregate particleprojects above the plane of the top of the mold.10.4 Place a single layer of venting fabric, in which a hole has been cut to match the 19-mm (34-in.) hole in the top end plate,over the aggregate. Plac
27、e the top plate on the mold, install bolts, and tighten. Attach the top and bottom valve assemblies andprepare to connect to hose from grout pump, as shown in Fig. 3.10.5 Measure flow (Test Method C939C939/C939M) and temperature of the representative sample of grout. Pour 800 6 10 mLinto a 1000-mL g
28、raduate for observation of expansion and bleeding, Test Method C940.10.6 If grout consistency is satisfactory, charge grout hopper and 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 th
29、e bottom of the cylindermold at valve 3, shown in Fig. 3.10.7 With valves 2,3, and 4 open, fill the cylinder slowly by partially closing bypass valve 1. When grout flows freely throughupper plug valve 4, open bypass and close valves 2 and 4. Apply 70 to 100 kPa (10 to 15 psi) air pressure on the sam
30、ple for 306 5 s through air valve 5; then close valve 3. Move the grout supply line to succeeding cylinders in turn and repeat the aboveprocedure for each.10.7.1 The total elapsed time for intruding and pressurizing a cylinder mold shall be between 112 and 3 min.10.7.2 Grout, if continually agitated
31、, may be used for intruding PAcylinders for as long as 30 min after original mixing providedno additional water is added and fluidity remains under 35 s, flow cone, Test Method C939C939/C939M.10.8 After grout expansion is complete, as determined by observation of the specimen set aside for the purpo
32、se, 10.5, removethe upper valve assembly and install a pipe plug in the center hole of the upper plate. Using care to avoid jarring the specimen,invert the cylinder, remove valve 3 assembly, and install a pipe plug in the center hole of the lower plate. Carefully turn theassembly back to its origina
33、l position. Clean valves and fittings immediately upon removal from end plates.11. Handling and Curing11.1 Do not disturb the specimen after removal of valve assemblies for at least 24 h. Then strip molds and cure cylinders inaccordance with the section on Curing of Practice C192/C192M.11.2 Protect
34、field-made specimens during initial storage period in the molds from direct sunlight or freezing temperatures.Whenlarge amounts of pozzolan are used in the grout mixture or in cool curing conditions, delay stripping of cylinders to avoid damagingthe specimens.12. Report12.1 Report the following info
35、rmation:12.1.1 Identification of specimens, date cast, and whether done in laboratory or field.12.1.2 Description of fine and coarse aggregate.12.1.3 Identification of cementing materials and admixtures.12.1.4 Description of grout including proportions, flow, temperature, expansion, and bleeding.12.
36、1.5 Temperatures at which the specimens were made and cured.13. Keywords13.1 cylinders;cylinders; density; flow cone; grout; grouting apparatus; preplaced-aggregate; prisms; strengthC943 174SUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this practice since the las
37、t issue, C943 02,10, that may impact the use of this practice. (Approved Dec. 15, 2017June 15, 2010.).)(1) Added new Section 3 Terminology to reference appropriate terminology documents under C01 and C09 and renumberedsubsequent sections.(1) Revised 1.3.(2) Added Footnote 2 and renumbered subsequent
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