1、Designation: C171 16Standard Specification forSheet Materials for Curing Concrete1This standard is issued under the fixed designation C171; 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 pare
2、ntheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This specification covers materials in sheet form usedfor cove
3、ring the surfaces of hydraulic cement concrete toinhibit moisture loss during the curing period and, in the caseof the white reflective type materials, to also reduce tempera-ture rise in concrete exposed to radiation from the sun. Thefollowing types are included:1.1.1 Curing Paper:1.1.1.1 Regular.1
4、1.1.2 White.1.1.2 Polyethylene Film:1.1.2.1 Clear.1.1.2.2 White Opaque.1.1.3 White-Burlap-Polyethylene Sheet.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.NOTE 1This specification does not cover materials such as burlap,c
5、otton mats, or rugs used with additional applications of water to maintaina water-saturated environment on such surfaces. Sheet materials havingadditional characteristics such as insulating properties and the ability tocarry additional water to the curing region are commercially available butare not
6、 currently addressed in this specification.1.3 The text of this standard references notes and footnoteswhich provide explanatory material. These notes and footnotesshall not be considered as requirements of the standard.2. Referenced Documents2.1 ASTM Standards:2C156 Test Method for Water Loss from
7、a Mortar SpecimenThrough Liquid Membrane-Forming Curing Compoundsfor ConcreteD829 Test Methods for Wet Tensile Breaking Strength ofPaper and Paper Products (Withdrawn 2009)3D4397 Specification for Polyethylene Sheeting forConstruction, Industrial, and Agricultural ApplicationsE96/E96M Test Methods f
8、or Water Vapor Transmission ofMaterialsE1347 Test Method for Color and Color-Difference Mea-surement by Tristimulus Colorimetry3. Terminology3.1 Definitions:3.1.1 curing paper, na composite consisting of two layersof kraft paper bonded together with a bituminous material andreinforced with fiber, us
9、ed for covering the surface of freshconcrete to inhibit moisture loss during the curing period.4. Ordering Information4.1 The purchaser shall specify the type of curing materialto be furnished under this specification.4.2 Lengths and widths of the rolls or mats of the sheetmaterials furnished shall
10、be as agreed upon between thepurchaser and seller.5. Performance Requirements5.1 The sheet materials furnished under this specificationshall be tough, strong, resilient, and capable of withstandingnormal job use without puncturing or tearing.5.2 The sheet material shall exhibit a water vapor transmi
11、s-sion rate (WVTR) of no more than 10 g/m2in 24 h when testedaccording to Test Methods E96/E96M using the Water Methodin the environment (test cabinet) specified in Test MethodC156.5.3 The daylight reflectance of the white side of whitecuring paper shall be at least 50 % when measured by TestMethod
12、E1347. The daylight reflectance of white polyethylenefilm and the polyethylene side of white burlap-polyethylenesheet shall be at least 70 % when measured according to TestMethod E1347.1This specification is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the d
13、irect responsibility of SubcommitteeC09.22 on Materials Applied to New Concrete Surfaces.Current edition approved Feb. 1, 2016. Published March 2016. Originallyapproved in 1942. Last previous edition approved in 2007 as C17107. DOI:10.1520/C0171-16.2For referenced ASTM standards, visit the ASTM webs
14、ite, 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.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes sectio
15、n appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1NOTE 2Daylight reflectance is total luminous reflectance factor, CIEtristimulus value Y for the CIE 1931 (2) standard observer and CIEstandard illumi
16、nant C or D65.6. Physical Requirements6.1 Curing Paper shall consist of two sheets of kraft papercemented together with a bituminous material in which areembedded cords or strands of fiber running in both directionsand not more than 32 mm apart. The paper shall be light incolor, shall be free of vis
17、ible defects, and shall have a uniformappearance. White paper shall have a white surface on at leastone side.6.1.1 The tensile strength of curing paper shall be no lessthan 5.25 kN/m of width in the machine direction and 2.62kN/m of width in the cross direction when measured accordingto Test Methods
18、 D829.6.2 Polyethylene Film shall consist of a single sheet manu-factured from polyethylene resins. It shall be free of visibledefects and shall have a uniform appearance. The clear typeshall be essentially transparent. The opaque film shall containwhite pigment.6.2.1 The nominal thickness of polyet
19、hylene film shall beno less than 0.10 mm as determined according to SpecificationD4397 . Thickness at any point shall be no less than 0.075 mm.6.2.2 The impact resistance and mechanical properties shallbe as required in Specification D4397.6.3 White Burlap-Polyethylene Sheeting shall consist ofburla
20、p weighing not less than 305 g/m2extrusion coated on oneside with white opaque polyethylene at least 0.10 mm thick andmeeting the other requirements of 6.2. The polyethylenematerial shall be securely bonded to the burlap so that therewill be no separation of the materials during handling andcuring o
21、f the concrete.7. Sampling7.1 Samples of film or sheeting sufficient to determineconformance with this specification shall be taken at random.8. Keywords8.1 concrete curing materials; polyethylene film; sheet ma-terial for curing concrete; curing paper; white burlap-polyethylene sheetSUMMARY OF CHAN
22、GESCommittee C09 has identified the location of selected changes to this specification since the last issue,C171 07, that may impact the use of this specification. (Approved Feb. 1, 2016.)(1) Revised to delete extraneous inch-pound units.ASTM International takes no position respecting the validity o
23、f any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to
24、 revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.
25、Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is c
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