1、Designation: C 596 07Standard Test Method forDrying Shrinkage of Mortar Containing Hydraulic Cement1This standard is issued under the fixed designation C 596; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method determines the change in length ondrying of mortar bars containing hydraulic cement and gradedstandard sand.1.2
3、 The values stated in SI units are to be regarded as thestandard. Values given in parentheses are for information only.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-pri
4、ate safety and health practices and determine the applica-bility of regulatory limitations prior to use. (WarningFreshhydraulic cementitious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure).22. Referenced Documents2.1 ASTM Standards:3C 157/C 157M Test Meth
5、od for Length Change of Hard-ened Hydraulic-Cement Mortar and ConcreteC 219 Terminology Relating to Hydraulic CementC 305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC 490 Practice for Use of Apparatus for the Determinationof Length Change of Hardened C
6、ement Paste, Mortar, andConcreteC511 Specification for Mixing Rooms, Moist Cabinets,Moist Rooms, and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC 778 Specification for Standard SandC 1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for
7、Use in the PhysicalTesting of Hydraulic CementsC 1437 Test Method for Flow of Hydraulic Cement MortarE 177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3. Terminology3.1 The term “drying shrinkage” is defined as the decreasein length of the test specimen, where the decrease is
8、 caused byany factor other than externally applied forces under statedconditions of temperature, relative humidity and evaporationrate in the environment; the term includes the net effect of avariety of phenomena tending to bring about both increases anddecreases in length during the period in which
9、 the testspecimens under consideration are stored in the environmentand in which a number of processes, including hydration of thecement, are taking place at a variety of rates.3.2 Other terms used in this test method are defined inTerminology C 219.4. Significance and Use4.1 This test method establ
10、ishes a selected set of conditionsof temperature, relative humidity and rate of evaporation of theenvironment to which a mortar specimen of stated compositionshall be subjected for a specified period of time during whichits change in length is determined and designated “dryingshrinkage”.4.2 The dryi
11、ng shrinkage of mortar as determined by thistest method has a linear relation to the drying shrinkage ofconcrete made with the same cement and exposed to the samedrying conditions.4Hence this test method may be used whenit is desired to develop data on the effect of a hydraulic cementon the drying s
12、hrinkage of concrete made with that cement.5. Apparatus5.1 Weighing Devices and WeightsWeighing devices andweights used in determining the mass of materials for mortarmixtures shall conform to the requirements of SpecificationC 1005.1This test method is under the jurisdiction of ASTM Committee C01 o
13、n Cementand is the direct responsibility of Subcommittee C01.31 on Volume Change.Current edition approved June 1, 2007. Published July 2007. Originally approvedin 1967. Last previous edition approved in 2001 as C 596 01.2Section on Safety, Manual of Cement Testing, Annual Book of Standards,Vol04.01.
14、3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.4Data pertaining to the relation of the drying shrinkage of m
15、ortar test specimensand of the drying shrinkage of concrete test specimens as affected by the cementunder specified laboratory test conditions, may be found in RR/120:C-1, availablefrom ASTM Headquarters; in a report of the California Division of Highways.“Significance of the Test for Contraction of
16、 Mortar in Air with Respect toPerformance of Cements in Concrete,” Oct. 18, 1961; and in the paper by Mardulier,F. J., Schneider, A. M., and Stockett, A. L., “An Analysis of Drying Shrinkage. Datafor Portland Cement Mortar and Concrete,” Journal of Materials, JMLSA,Am. Soc.Testing Mats., Vol 2, No.
17、4, 1967, pp. 829842. A relevant paper by H. T. Arnientitled “The Significance of the Correlation Coefficient for Analyzing EngineeringData” was published in Materials Research and Standards, MTRSA, Am. Soc.Testing Mats., Vol. 11, No. 5, 1971, pp. 1619.1*A Summary of Changes section appears at the en
18、d of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2 Glass GraduatesGlass graduates of suitable capaci-ties shall conform to the requirements of Specification C 1005.5.3 MoldsMolds for test specimens shall provide fo
19、r 25by 25 by 285-mm or 1 by 1 by 1114-in. prisms having aneffective gage length of 250 mm or 10 in. respectively and shallconform to the requirements of Practice C 490.5.4 TrowelThe trowel shall have a straight-edged steelblade 100 to 150 mm (4 to 6 in.) in length.5.5 TamperThe tamper shall conform
20、to the requirementsof Test Method C 157/C 157M.5.6 Demolding ApparatusThe demolding apparatus shallconform to the requirements of Test Method C 157/C 157M.5.7 Length ComparatorThe length comparator shall con-form to the requirements of Practice C 490.6. Temperature and Humidity6.1 LaboratoryThe temp
21、erature of the laboratory, drymaterials, and mixing water, and the relative humidity of theair in the laboratory shall conform to the requirements ofSpecification C511.6.2 Moist Storage FacilityThe temperature and humidityof the air in the moist storage facility shall conform to therequirements of S
22、pecification C511.6.3 Drying Room and ControlsThe drying room andcontrols shall conform to the requirements of Test MethodC 157/C 157M.7. Graded Standard Sand7.1 The graded standard sand shall conform to SpecificationC 778.8. Number of Test Specimens8.1 Make at least four test specimens (Note 1).NOT
23、E 1Although the number of test specimens may consist of fourspecimens from a single batch of mortar, it is preferable that twelvespecimens be made with four specimens being made from each of threebatches, with each batch being made on a different day.9. Preparation of Molds9.1 Prepare the specimen m
24、olds as required by PracticeC 490.10. Preparation of Test Specimens10.1 Mortar ProportionsA batch of mortar shall consistof 750 g of cement, 1500 g of graded standard sand, and anamount of mixing water sufficient to produce a flow of 110 65 %. The flow shall be determined in conformance with theproc
25、edure as described in Test Method C 1437.10.2 Mixing MortarMix the mortar in a mechanical mixeras required by Practice C 305.10.3 Molding of SpecimensMold the specimens as re-quired by Test Method C 157/C 157M.11. Curing, Storage, and Taking Comparator Readings ofTest Specimens11.1 Cure, store, and
26、take comparator readings of the testspecimens as required by Test Method C 157/C 157M, exceptas follows:11.1.1 Moist cure the specimens in the molds for 24 h 6 30min. If the strength of the specimens is insufficient to allowproper removal from the mold at 24 h, moist cure in the moldfor 48 h 6 30 mi
27、n.11.1.2 Remove the specimens from the molds and cure inlime-saturated water for 48 h. If the specimens have been moistcured in the mold for 48 h, cure in lime-saturated water for 24h.11.1.3 At the age of 72 h 6 30 min remove the specimensfrom water, wipe with damp cloth and immediately obtain aleng
28、th comparator reading for each specimen. Then place thespecimens in air storage for 25 days. Obtain a length compara-tor reading for each specimen after 4, 11, 18, and 25 days of airstorage.12. Calculation12.1 Calculate the length change of each specimen at eachage of air drying by subtracting the i
29、nitial comparator reading,taken after removal from water storage, from the comparatorreading taken at each age of air drying and express asmillionths and as the percent of the effective gage length. Donot prefix a shrinkage value with a minus sign.12.2 Report the average change in unit length, expre
30、ssed asmillionths, and as a percent of the effective gage length of fourspecimens from the same batch of mortar as the dryingshrinkage of the mortar. If any one test specimen is manifestlyfaulty, discard it. If more than one test specimen is discarded,do not report the results and repeat the test on
31、 a new batch ofmortar. If more than one batch of mortar has been tested, reportthe average result of the individual batches. When the experi-menter is clearly aware that a gross deviation from prescribedexperimental procedure has taken place, discard the resultantobservation, whether or not it agree
32、s with the rest of the dataand without recourse to statistical tests for outliers.NOTE 2An approximation of ultimate drying shrinkage of mortar maybe determined by plotting the shrinkage values as a function of thereciprocal of the time. The time includes the moist curing period. Anexample of the me
33、thod is given in Fig. 1 where a logarithmic scale is usedfor the drying shrinkage values and a reciprocal scale for the total time inweeks.13. Precision and Bias13.1 Precision:13.1.1 The single-laboratory-operator multibatch-day preci-sion has been found to be 0.0223 (1S %) and the single-operator m
34、ultilaboratory-batch-day precision has been found tobe 6.6 (R1S %) as defined in Practice E 177, therefore 95 %percent of the time two test results (each the average of fourdeterminations of properly conducted tests) obtained by thesame operator on different days should not differ by more than70 mil
35、lionths, and the test results (each the average of fourdeterminations of properly conducted tests) obtained by twolaboratories should not differ by more than 25 % of their mean.13.1.2 RepeatabilityWhere a test result is the average offour specimens from a single batch, the difference betweenduplicat
36、e results by the same operator should not be consideredsuspect unless it exceeds 70 millionths. Where a test result isthe average of twelve specimens, four specimens being testedfrom each of three batches, the difference between duplicateC596072results by the same operator should not be considered s
37、uspectunless it exceeds 40 millionths.13.1.3 ReproducibilityThe average result of four ortwelve specimens reported by one laboratory should not beconsidered suspect unless it differs from that of anotherlaboratory by more than 25 % of their mean.13.2 BiasNo justifiable statement can be made on the b
38、iasof this test method since no reference samples are available.14. Keywords14.1 drying shrinkage; hydraulic cement; method; mortarSUMMARY OF CHANGESCommittee C01 has identified the location of selected changes to this test method since the last issue,C 596 04, that may impact the use of this test m
39、ethod. (Approved June 1, 2007)(1) Corrected references in 5.2 and 6.1.ASTM 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 the validity of a
40、ny 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. Your comments are
41、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 comments have not recei
42、ved 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 Ultimate Drying Shrinkage of MortarC596073
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