ASTM_C_1552_-_16.pdf

Designation:C155216Standard 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 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 proce-dures for capping concrete masonry units,related units,includ-ing coupons or other specimens obtained from such units,andmasonry prisms for compression testing.NOTE1The 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 standard.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 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:2C140 Test Methods for Sampling and Testing ConcreteMasonry Units and Related UnitsC617 Practice for Capping Cylindrical Concrete 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 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 Methods C140,Practice C617,and Test Method C1314.NOTE2Specimens 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 characteristics 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 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 PlateIf 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 within116in.(1.6 mm)over thelength of the plate.Do not use a capping wear plate with sulfurcapping materials.NOTE3A 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 cement materials.5.2 Casting PlateIf used,the casting plate shall be oftransparent glass with a thickness of not less than12in.(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 Materials: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.1,2016.Published December 2016.Originallyapproved in 2002.Last previous edition approved in 2015 as C1552 15.DOI:10.1520/C1552-16.2For 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 appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.1.1.1 In addition to the compressive strength testing re-quired in 6.2,qualification tests shall be made to determine theeffects of water-cement ratio 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.NOTE4The water-gypsum cement ratio should typically be between0.26 and 0.30.Use of