ASTM C1148-1992a(2002) Standard Test Method for Measuring the Drying Shrinkage of Masonry Mortar《砖石建筑用灰浆干缩试验方法》.pdf
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1、Designation: C 1148 92a (Reapproved 2002)Standard Test Method forMeasuring the Drying Shrinkage of Masonry Mortar1This standard is issued under the fixed designation C 1148; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year
2、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 test method covers the measurement of unre-strained drying shrinkage of masonry mortars.1.2 This test method
3、is applicable to Specification C 270Type N, Type S, and Type M mortars under the property orproportion specifications. Due to the tendency to damage lowerstrength specimens during demolding, it is not applicable tolower strength mortars, such as Type O mortars.1.3 This test method is intended for re
4、search purposes only.1.4 The values stated in SI units are to be regarded as thestandard. The values in parentheses are provided for informa-tion only.1.5 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
5、 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 109 Test Method for Compressive Strength of HydraulicCement Mortars (Using 2-in. or 50-mm Cube Specimens)2C 157 Test Met
6、hod for Length Change of Hardened Hy-draulic Cement Mortar and Concrete3C 270 Specification for Mortar for Unit Masonry4C 305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortar of Plastic Consistency2C 490 Practice for Use of Apparatus for the Determinationof Length Change of Harden
7、ed Cement Paste, Mortar, andConcrete2C 511 Specification for Moist Cabinets, Moist Rooms, andWater Storage Tanks Used in the Testing of HydraulicCements and Concretes2C 778 Specification for Standard Sand23. Significance and Use3.1 The drying shrinkage of mortar as determined by thistest method is a
8、 measure of the decrease in length of testspecimens under controlled drying conditions, after an initialperiod of moist curing.3.2 Since test specimens are not completely unrestrainedduring the initial period of moist curing, measurements ofdrying shrinkage by this test method are most useful forcom
9、parative purposes rather than as absolute values.3.3 The drying shrinkage of unrestrained laboratory testedmortar samples is different from that experienced in a masonrywall where influences include restraint, masonry unit absorp-tion, ambient temperature and humidity, thickness of joint,length of c
10、ontinuous wall, etc.4. Apparatus4.1 Scales and Weights, Glass Graduates, and Length Com-parator, conforming to requirements of Specification C 490.4.2 Molds (for test specimens), providing for 25 by 25 by285-mm (1 by 1 by 11.25-in.) prisms having an effective gagelength of 250 mm (10 in.), and confo
11、rming to the requirementsof Specification C 490.4.3 Studs, conforming to the requirements of SpecificationC 490.4.4 Tamper and Demolding Apparatus, conforming to re-quirements of Test Method C 157.4.5 Trowel, having a straight edged steel blade 100 to 150mm (4 to 6 in.) in length.5. Temperature and
12、Humidity5.1 Molding RoomThe temperature of the molding room,dry materials, mixing water, and the relative humidity of the airin the molding room shall conform to the requirements ofSpecification C 490.5.2 Moist Storage FacilityThe temperature and humidityof the air in the moist storage facility shal
13、l conform to therequirements of Specification C 511.5.3 Drying Room and ControlsThe drying room andcontrols shall conform to the requirements of Test MethodC 157.1This test method is under the jurisdiction of ASTM Committee C12 on Mortarsfor Unit Masonry and is the direct responsibility of Subcommit
14、tee C12.02 onResearch and Methods of Test.Current edition approved May 21, 1992. Published July 1992. Originallypublished as C 1148 90. Last previous edition C 1148 92.2Annual Book of ASTM Standards, Vol 04.01.3Annual Book of ASTM Standards, Vol 04.02.4Annual Book of ASTM Standards, Vol 04.05.1Copyr
15、ight ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Test Specimens6.1 Number of Test Specimens:6.1.1 Make five test specimens. Although the number of testspecimens may consist of five specimens made from a singlebatch of mortar, it is prefe
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