ASTM C1552-2014a 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践规程》.pdf
《ASTM C1552-2014a 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践规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1552-2014a 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践规程》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1552 14aStandard 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 of rev
2、ision, 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 proce-dures for capping concrete masonry units, rel
3、ated units, includ-ing coupons or other specimens obtained from such units, andmasonry prisms for compression testing.NOTE 1The testing laboratory performing these test methods shouldbe evaluated in accordance with Practice C1093.1.2 The values stated in inch-pound units are to be regardedas standar
4、d. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.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 stand
5、ard 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:2C140 Test Methods for Sampling and Testing ConcreteMasonry Units and Related UnitsC617 Practice for Capping Cylindrical Concret
6、e SpecimensC1093 Practice for Accreditation of Testing Agencies forMasonryC1232 Terminology of MasonryC1314 Test Method for Compressive Strength of MasonryPrisms3. Terminology3.1 Terminology defined in Terminology C1232 shall applyfor this practice.4. Significance and Use4.1 This practice describes
7、procedures for providing planesurfaces on the two bearing surfaces of units and prisms. Thepurpose of this standard is to provide consistent and standard-ized procedures for capping units and prisms for compressiontesting. The procedures are based on those contained (orpreviously contained) in Test
8、Methods C140, Practice C617,and Test Method C1314.NOTE 2Specimens capped using this practice will vary significantly insize and weight. Appropriate care and handling may differ based onspecimen size and weight. Provide care and handling as needed to providefor proper capping based on the physical ch
9、aracteristics of the specimenbeing capped.5. Apparatus5.1 Capping PlateIf used, the capping plate shall be madeof steel having a thickness of not less than 1 in. (25.4 mm), ora polished plate of granite or diabase at least 3 in. (76 mm)thick. The capping surface shall be plane within 0.002 in. in12
10、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 than 0.05 in.2(32 mm2) in surface area. At thetime of capping, the capping surface shall be level within116in. (1.6 mm) over the length of the plate.5.1.1 Capping Wear PlateI
11、f used, the capping wear plateshall be placed directly on top of the capping plate and shallmeet the requirements of 5.2. At the time of capping, the wearplate surface shall be level within116 in. (1.6 mm) over thelength of the plate. Do not use a capping wear plate with sulfurcapping materials.NOTE
12、 3A capping wear plate has been found to reduce the potentialof damage to the capping plate. The capping wear plate is typically moreresistant to scratches and can be replaced at less cost than that required toresurface the capping plate. See Fig. 1 for a schematic of capping setupwhen using gypsum
13、cement materials.5.2 Casting PlateIf used, the casting plate shall be oftransparent glass with a thickness of not less than12 in. (13mm). The casting 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 Materia
14、ls:1This practice is under the jurisdiction of ASTM Committee C15 on Manufac-tured Masonry Units and is the direct responsibility of Subcommittee C15.04 onResearch.Current edition approved Dec. 1, 2014. Published December 2014. Originallyapproved in 2002. Last previous edition approved in 2014 as C1
15、552 14. DOI:10.1520/C1552-14A.2For 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.*A Summary of Changes section a
16、ppears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.1.1.1 In addition to the compressive strength testing re-quired in 6.2, qualification tests shall be made to determine theeffects of water-cement rati
17、o and age on compressive strength.Procedures used for preparing the high strength gypsumcement capping materials shall ensure that water-cement ratiosused for each batch provide the required strength.NOTE 4The water-gypsum cement ratio should typically be between0.26 and 0.30. Use of low water-gypsu
18、m cement ratios and vigorousmixing will usually permit development of 3500 psi (24.1 MPa) at ages ofone or two hours. Higher water-gypsum cement ratios extend workingtime, but reduce strength.6.1.1.2 Do not add fillers or extenders to the high strengthgypsum cement.NOTE 5Retarders extend working tim
19、e for capping materials but theireffects on required water-cement ratio should be determined prior to use.NOTE 6See Appendix X1 for more information on high-strengthgypsum capping materials and product recommendations.6.1.2 Sulfur Capping Materials:6.1.2.1 Proprietary or laboratory prepared sulfur m
20、ixturesshall contain 40 to 60 % sulfur by weight, the remainder beingground fire 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 and6.1.2. Do not use other capping materials.NOTE 7Examples of mate
21、rials that have been found to be unsuitablefor capping purposes include, but are not limited to: low-strength moldingplaster, plaster of paris, mixtures of plaster of paris and portland cement,and other cement-based materials.6.2 Compressive Strength of Capping MaterialsThe com-pressive strength of
22、the capping material shall be at least3500 psi (24.1 MPa) at an age of 2 h. The cube molds andmethods of preparing and testing the cubes shall be inaccordance with Practice C617. The capping material shall beplaced in the cube at capping consistency. Store the filledmolds in laboratory air. Remove c
23、ubes of sulfur material aftersolidification is complete and remove cubes of gypsum cementmaterial from the molds not more than 15 min prior to testing.Test cubes at an age of 2 h 6 10 min after completing thefilling of the molds.6.2.1 The strength of the capping material shall be deter-mined on rece
24、ipt of a new lot and at intervals not exceedingthree months. If a given test of the capping material fails toconform to the strength requirements, the package from whichthe material was sampled shall not be used unless twoadditional subsequent samples are taken from the same pack-age and both of the
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