1、Designation:C1262/C1262M16Standard Test Method forEvaluating the Freeze-Thaw Durability of Dry-CastSegmental Retaining Wall Units and Related Concrete Units1This standard is issued under the fixed designation C1262/C1262M;the number immediately following the designation indicates theyear of original
2、 adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the resistance to freezing andthawing of dry-cast
3、 segmental retaining wall(SRW)units(seeSpecification C1372)and related concrete units.Units aretested in a test solution that is either potable tap water or 3%saline solution depending on the intended use of the units inactual service.NOTE1Related concrete units include units such as hollow and soli
4、dconcrete masonry units,concrete brick,and concrete roof pavers.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningva
5、lues from the two systems may result in non-conformancewith this standard.Some values have only SI units because theinch-pound equivalents are not used in practice.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the us
6、er 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 UnitsC1093 Practice for Accreditati
7、on of Testing Agencies forMasonryC1232 Terminology of MasonryC1372 Specification for Dry-Cast Segmental Retaining WallUnits3.Terminology3.1 Terminology defined in Terminology C1232 shall applyfor this test method.4.Significance and Use4.1 The procedure described in this test method is intendedto det
8、ermine the effects of freezing and thawing on SRW andrelated units in the presence of potable tap water or salinesolution.4.2 The procedure is not intended to provide a quantitativemeasure to determine an expected length of service for aspecific type of concrete unit.NOTE2The testing laboratory perf
9、orming this test method should beevaluated in accordance with Practice C1093.5.Apparatus5.1 Freeze-Thaw ChamberUse a chamber that has:5.1.1 Forced air circulation,5.1.2 A programmable air-temperature controller capable ofautomatically performing at least two freezing and thawingcycles per 24-h perio
10、d during testing,5.1.3 A temperature range of at least 10 to 100F 25 to40C,and5.1.4 The capability of maintaining the air temperaturethroughout the chamber within the specified temperatureranges for the duration of the test cycle.5.2 ContainersUse containers that are:5.2.1 Made of non-rigid plastic,
11、5.2.2 Of sufficient size to contain each test specimen andspecimen supports as illustrated in Fig.1,5.2.3 Of sufficient size to provide a minimum of18in.3mm and a maximum of 112in.40 mm of test solutionsurrounding the sides of the specimen,5.2.4 Suppliedwithatightly-fittinglidtoreduceevaporation,and
12、5.2.5 Flat enough so that the specimen will not deviate fromlevel by more than116in.2 mm from one end of thespecimen to the opposite end when placed on the support rods.5.3 Specimen SupportsSupport the specimen above thecontainer bottom.Use supports that are:1This test method is under the jurisdicti
13、on of ASTM Committee C15 onManufactured Masonry Units and is the direct responsibility of SubcommitteeC15.03 on Concrete Masonry Units and Related Units.Current edition approved Dec.15,2016.Published January 2017.Originallyapproved in 1994.Last previous edition approved in 2010 as C1262 10.DOI:10.15
14、20/C1262_C1262M-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 en
15、d of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelop
16、ment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 5.3.1 Rods having a thickness of186124in.3 6 1 mmand a width of the portion that contacts the specimens of nogreater than the rod thickness(see Note 3),5.3.2 Made of a solid,non-corrosive,non-absorptive mate-rial(brass,plastic,and so forth),and5.3.3 Capable of supporting the specimen in both thelongitudinal and transverse directions(see Note 4).NOTE3The ro
