ASTM C827 C827M-2016 Standard Test Method for Change in Height at Early Ages of Cylindrical Specimens of Cementitious Mixtures《碳化混合物圆柱形试样的早期高度变化的标准试验方法》.pdf
《ASTM C827 C827M-2016 Standard Test Method for Change in Height at Early Ages of Cylindrical Specimens of Cementitious Mixtures《碳化混合物圆柱形试样的早期高度变化的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C827 C827M-2016 Standard Test Method for Change in Height at Early Ages of Cylindrical Specimens of Cementitious Mixtures《碳化混合物圆柱形试样的早期高度变化的标准试验方法》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C827/C827M 10C827/C827M 16Standard Test Method forChange in Height at Early Ages of Cylindrical Specimens ofCementitious Mixtures1This standard is issued under the fixed designation C827/C827M; the number immediately following the designation indicates the yearof original adoption or, i
2、n the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers the determination of change in height of cylindrical spec
3、imens from the time of molding until themixture is hard.1.2 This test method covers height change measurements at early ages for cementitious mixtures of paste, grout, mortar, andconcrete.1.3 This test method is intended for determination of changes in height that occur from the time of placement un
4、til the specimenis fully hard. These include shrinkage or expansion due to hydration, settlement, evaporation, and other physical and chemicaleffects.1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exa
5、ct equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof
6、the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.1.6 The text of this test method references notes and footnotes that provide explanatory information. These notes and footnotesshall not be considered
7、as requirements of the test method.2. Referenced Documents2.1 ASTM Standards:2C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube Specimens)C125 Terminology Relating to Concrete and Concrete AggregatesC138/C138M Test Method for Density (Unit Weight)
8、, Yield, and Air Content (Gravimetric) of ConcreteC143/C143M Test Method for Slump of Hydraulic-Cement ConcreteC185 Test Method for Air Content of Hydraulic Cement MortarC191 Test Methods for Time of Setting of Hydraulic Cement by Vicat NeedleC192/C192M Practice for Making and Curing Concrete Test S
9、pecimens in the LaboratoryC305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic ConsistencyC403/C403M Test Method for Time of Setting of Concrete Mixtures by Penetration ResistanceC670 Practice for Preparing Precision and Bias Statements for Test Methods for Construct
10、ion MaterialsC807 Test Method for Time of Setting of Hydraulic Cement Mortar by Modified Vicat NeedleC939 Test Method for Flow of Grout for Preplaced-Aggregate Concrete (Flow Cone Method)C953 Test Method for Time of Setting of Grouts for Preplaced-Aggregate Concrete in the LaboratoryC1437 Test Metho
11、d for Flow of Hydraulic Cement Mortar1 This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.68 onVolume Change.Current edition approved June 15, 2010April 1, 2016. Published July 2010June 2016. Origi
12、nally approved in 1975. Last previous edition approved in 20052010 asC827C827 10. 01a (2005). DOI: 10.1520/C0827_C0827M-10.DOI: 10.1520/C0827_C0827M-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Sta
13、ndardsvolume 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 the previous version. Becauseit may not be technically possibl
14、e 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 of Changes section appears at the end of this standardCopyri
15、ght ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 DefinitionsThe terms used in this test method are defined in Terminology C125.3.2 Definitions of Terms Specific to This Standard:3.2.1 early-age change in height, nthe measur
16、ed increase or decrease in height of a laterally confined cylindrical test specimenfrom the time of molding to when the mixture becomes hard. The user may want to define this age as the time when a companionspecimen of the same batch has reached the time of final setting by Test Method C191 (paste),
17、 C953 (mortar or grout),C403/C403M (concrete), or establish a predetermined age in minutes from the time the specimen is cast as the defined age to recordthe final measurement. Changes in height are measured and expressed as a positive or negative change in the height of a testspecimen that is restr
18、ained from lateral movement.4. Significance and Use4.1 This test method provides a means for comparing the relative shrinkage or expansion of cementitious mixtures. It isparticularly applicable to grouting, patching, and form-filling operations where the objective is to completely fill a cavity or o
19、therdefined space with a freshly mixed cementitious mixture that will continue to fill the same space at time of hardening. It wouldbe appropriate to use this test method as a basis for prescribing mixtures having restricted or specified volume change before themixture becomes hard.4.2 This test met
20、hod can be used for research purposes to provide information on volume changes taking place in cementitiousmixtures between the time just after mixing and the time of hardening. However, the specimen used in this test method is notcompletely unrestrained so that the measurements are primarily useful
21、 for comparative purposes rather than as absolute values.Further, the degree of restraint to which the specimen is subjected varies with the viscosity and degree of hardening of the mixture.5. Apparatus (see Fig. 1)5.1 Projected Light Source, a lamp and a condensing lens of sufficient intensity to a
22、dequately project a light beam on a wallabout 5 m 15 ft from the light source. Protect the test specimen from heat from the light source and limit air movement (Note1).NOTE 1Placing a sheet of transparent glass or plastic between the light source and the test specimens may be beneficial.5.2 Indicato
23、r Ball, a spherical ball of nonabsorptive material with a density that is 55 6 5 % of the density of the cementitiousmixture being tested, having a diameter not more than 16 mm 58 in. nor less than 6 mm 14 in., and composed of materials thathave no reaction with the cementitious mixture during the t
24、est period.3NOTE 2Adensity of approximately 1.2 Mg/m3 has been found appropriate for most uses of this test method. The density of the cementitious mixturemay be calculated from values for “unit weight” obtained using Test Method C138/C138M (concrete) or C185 (mortar, grout, or paste).5.3 Magnifying
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