ASTM C1552-2015 Standard Practice for Capping Concrete Masonry Units Related Units and Masonry Prisms for Compression Testing《压缩试验用盖顶混凝土砌块 相关砌块和砌柱的标准实施规程》.pdf
《ASTM C1552-2015 Standard Practice for Capping Concrete Masonry Units Related Units and Masonry Prisms for Compression Testing《压缩试验用盖顶混凝土砌块 相关砌块和砌柱的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1552-2015 Standard Practice for Capping Concrete Masonry Units Related Units and Masonry Prisms for Compression Testing《压缩试验用盖顶混凝土砌块 相关砌块和砌柱的标准实施规程》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1552 14aC1552 15Standard Practice forCapping Concrete Masonry Units, Related Units andMasonry Prisms for Compression Testing1This standard is issued under the fixed designation C1552; the number immediately following the designation indicates the year oforiginal adoption or, in the cas
2、e 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 apparatus, materials, and procedures for capping concrete masonry uni
3、ts, related units, includingcoupons or other specimens obtained from such units, and masonry prisms for compression testing.NOTE 1The testing laboratory performing these test methods should be evaluated in accordance with Practice C1093.1.2 The values stated in inch-pound units are to be regarded as
4、 standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of
5、this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C140 Test Methods for Sampling and Testing Concrete Masonry Units and Related UnitsC617 Practice for Capping Cylindrical
6、 Concrete SpecimensC1093 Practice for Accreditation of Testing Agencies for MasonryC1232 Terminology of MasonryC1314 Test Method for Compressive Strength of Masonry Prisms3. Terminology3.1 Terminology defined in Terminology C1232 shall apply for this practice.4. Significance and Use4.1 This practice
7、 describes procedures for providing plane surfaces on the two bearing surfaces of units and prisms. The purposeof this standard is to provide consistent and standardized procedures for capping units and prisms for compression testing. Theprocedures are based on those contained (or previously contain
8、ed) in Test Methods C140, Practice C617, and Test Method C1314.NOTE 2Specimens capped using this practice will vary significantly in size and weight.Appropriate care and handling may differ based on specimensize and weight. Provide care and handling as needed to provide for proper capping based on t
9、he physical characteristics of the specimen being capped.5. Apparatus5.1 Capping PlateIf used, the capping plate shall be made of steel having a thickness of not less than 1 in. (25.4 mm), or apolished plate of granite or diabase at least 3 in. (76 mm) thick. The capping surface shall be plane withi
10、n 0.002 in. in 12 in.(0.05 mm in 300 mm) and shall be free of gouges, grooves, and indentations greater than 0.010 in. (0.25 mm) deep or greater than0.05 in.2 (32 mm2) in surface area.At the time of capping, the capping surface shall be level within 116 in. (1.6 mm) over the lengthof the plate.5.1.1
11、 Capping Wear PlateIf used, the capping wear plate shall be placed directly on top of the capping plate and shall meetthe requirements of 5.2. At the time of capping, the wear plate surface shall be level within 116 in. (1.6 mm) over the length ofthe plate. Do not use a capping wear plate with sulfu
12、r capping materials.1 This practice is under the jurisdiction of ASTM Committee C15 on Manufactured Masonry Units and is the direct responsibility of Subcommittee C15.04 on Research.Current edition approved Dec. 1, 2014Dec. 1, 2015. Published December 2014January 2016. Originally approved in 2002. L
13、ast previous edition approved in 2014 asC1552 14.C1552 14a. DOI: 10.1520/C1552-14A.10.1520/C1552-15.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Doc
14、ument 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 possible to adequately depict all changes accurately, ASTM
15、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 standardCopyright ASTM International, 100 Barr Harbor Drive, PO Bo
16、x C700, West Conshohocken, PA 19428-2959. United States1NOTE 3Acapping wear plate has been found to reduce the potential of damage to the capping plate. The capping wear plate is typically more resistantto scratches and can be replaced at less cost than that required to resurface the capping plate.
17、See Fig. 1 for a schematic of capping setup when usinggypsum cement materials.5.2 Casting PlateIf used, the casting plate shall be of transparent glass with a thickness of not less than 12 in. (13 mm). Thecasting plate shall be plane within 0.002 in. in 12 in. (0.05 mm in 300 mm).6. Materials6.1 Cap
18、ping Materials:6.1.1 High Strength Gypsum Cement Capping Materials:6.1.1.1 In addition to the compressive strength testing required in 6.2, qualification tests shall be made to determine the effectsof water-cement ratio and age on compressive strength. Procedures used for preparing the high strength
19、 gypsum cement cappingmaterials shall ensure that water-cement ratios used for each batch provide the required strength.NOTE 4The water-gypsum cement ratio should typically be between 0.26 and 0.30. Use of low water-gypsum cement ratios and vigorous mixing willusually permit development of 3500 psi
20、(24.1 MPa) at ages of one or two hours. Higher water-gypsum cement ratios extend working time, but reducestrength.NOTE 4The water-gypsum cement ratio should typically be between 0.26 and 0.30. Use of low water-gypsum cement ratios and vigorous mixing willusually permit development of 3500 psi (24.1
21、MPa) at ages of one or two hours. Higher water-gypsum cement ratios extend working time, but reducestrength.6.1.1.2 Do not add fillers or extenders to the high strength gypsum cement.NOTE 5Retarders extend working time for capping materials but their effects on required water-cement ratio should be
22、determined prior to use.NOTE 6See Appendix X1 for more information on high-strength gypsum capping materials and product recommendations.NOTE 5Retarders extend working time for capping materials but their effects on required water-cement ratio should be determined prior to use.NOTE 6See Appendix X1
23、for more information on high-strength gypsum capping materials and product recommendations.6.1.2 Sulfur Capping Materials:6.1.2.1 Proprietary or laboratory prepared sulfur mixtures shall contain 40 to 60 % sulfur by weight, the remainder being groundfire clay or other suitable inert material passing
24、 a No. 100 (150-m) sieve with or without a plasticizer.6.1.3 Use only capping materials identified in 6.1.1 and 6.1.2. Do not use other capping materials.NOTE 7Examples of materials that have been found to be unsuitable for capping purposes include, but are not limited to: low-strength molding plast
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