ASTM C1552-2014 Standard Practice for Capping Concrete Masonry Units Related Units and Masonry Prisms for Compression Testing《压缩试验用压盖混凝土圬工单位 相关元件和圬工棱柱的标准实施规程》.pdf
《ASTM C1552-2014 Standard Practice for Capping Concrete Masonry Units Related Units and Masonry Prisms for Compression Testing《压缩试验用压盖混凝土圬工单位 相关元件和圬工棱柱的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1552-2014 Standard Practice for Capping Concrete Masonry Units Related Units and Masonry Prisms for Compression Testing《压缩试验用压盖混凝土圬工单位 相关元件和圬工棱柱的标准实施规程》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1552 12C1552 14Standard 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 case
2、 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 unit
3、s, 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 t
5、his 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 containe
8、d) 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 th
9、e 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), 1 in.(25.4 mm), or a polished plate of granite or diabase at least 3 in. (76 mm) 3 in. (76 mm) thick. The cappin
10、g surface shall be planewithin 0.002 in. in 12 in. (0.05 mm in 300 mm) 0.002 in. in 12 in. (0.05 mm in 300 mm) and shall be free of gouges, grooves, andindentations greater than 0.010 in. (0.25 mm) 0.010 in. (0.25 mm) deep or greater than 0.05 in.0.05 in.2 (32 mm2) in surface area.At the time of cap
11、ping, the capping surface shall be level within 116 in. (1.6 mm) over the length of the plate.5.1.1 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 le
12、vel within 116 in. (1.6 mm) over the length ofthe plate. Do not use a capping wear plate with sulfur 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 app
13、roved Dec. 1, 2012July 1, 2014. Published December 2012August 2014. Originally approved in 2002. Last previous edition approved in 20092012 asC1552 09a.C1552 12. DOI: 10.1520/C1552-12.10.1520/C1552-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Servic
14、e 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 the previous
15、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 of Changes
16、section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box 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 resis
17、tantto scratches and can be replaced at less cost than that required to resurface the capping plate. 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
18、). Thecasting plate shall be plane within 0.002 in. in 12 in. (0.05 mm in 300 mm).6. Materials6.1 Capping 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 effectso
19、f water-cement ratio and age on compressive strength. Procedures used for preparing the high strength 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.
20、Use of low water-gypsum cement ratios and vigorous mixing willusually permit development of 3500 psi (24.1 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 5Reta
21、rders extend working time for capping materials but their effects on required water-cement ratio should be determined prior to use.NOTE 6See Appendix X1 for more information on high-strength gypsum capping materials and product recommendations.6.1.2 Sulfur Capping Materials:6.1.2.1 Proprietary or la
22、boratory prepared sulfur mixtures shall contain 40 to 60 % sulfur by weight, the remainder being groundfire clay or other suitable inert material passing 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 mat
23、erials.NOTE 7Examples of materials that have been found to be unsuitable for capping purposes include, but are not limited to: low-strength molding plaster,plaster of paris, mixtures of plaster of paris and portland cement, and other cement-based materials.6.2 Compressive Strength of Capping Materia
24、lsThe compressive strength of the capping material shall be at least 3500 psi(24.1 MPa) 3500 psi (24.1 MPa) at an age of 2 h. 2 h. The cube molds and methods of preparing and testing the cubes shall bein accordance with Practice C617. The capping material shall be placed in the cube at capping consi
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