1、Designation: C 171 03Standard Specification forSheet Materials for Curing Concrete1This standard is issued under the fixed designation C 171; 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 pa
2、rentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope *1.1 This specification covers materials in sheet form usedfor cover
3、ing 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 as thestandard. Inch-pound units are provided in parentheses forinformation only.NOTE 1This specification does not cover materials such as
5、 burlap,cotton mats, or rugs used with additional applications of water to maintaina water-saturated environment on such surfaces. Procedures employingthese materials are discussed in ACI 308R. Sheet materials havingadditional characteristics such as insulating properties and the ability tocarry add
6、itional water to the curing region are commercially available butare not 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. Refer
7、enced Documents2.1 ASTM Standards:D 829 Test Methods for Wet Tensile Breaking Strength ofPaper and Paper Products2D 4397 Specification for Polyethylene Sheeting for Con-struction, Industrial and Agricultural Applications3E 96 Test Methods for Water Vapor Transmission of Mate-rials2E 1347 Test Method
8、 for Color and Color-Difference Mea-surement by Tristimulus (Filter) Colorimetry42.2 ACI Standard:ACI 308R Standard Practice for Curing Concrete53. Terminology3.1 Definitions:3.1.1 curing paper, na composite consisting of two layersof kraft paper bonded together with a bituminous material andreinfor
9、ced with fiber, used 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 sheetmaterial
10、s furnished shall 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 w
11、ater vapor transmis-sion rate (WVTR) of no more than 10 g/m2in 24 h when testedaccording to Procedure E of Test Methods E 96.5.3 The daylight reflectance of the white side of whitecuring paper shall be at least 50 % when measured by TestMethod E 1347. The daylight reflectance of white polyethylenefi
12、lm and the polyethylene side of white burlap-polyethylenesheet shall be at least 70 % when measured according to TestMethod E 1347.NOTE 2Daylight reflectance is total luminous reflectance factor, CIEtristimulus value Y for the CIE 1931 (2) standard observer and CIEstandard illuminant C or D65.6. Phy
13、sical Requirements6.1 Curing Paper shall consist of two sheets of kraft papercemented together with a bituminous material in which are1This specification is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.22 on Mater
14、ials Applied to New Concrete Surfaces.Current edition approved Jan. 10, 2003. Published March 2003. Originallyapproved in 1942. Last previous edition approved in 1997 as C 17197a.2Annual Book of ASTM Standards, Vol 15.09.3Annual Book of ASTM Standards, Vol 08.03.4Annual Book of ASTM Standards, Vol 0
15、6.01.5Available from American Concrete Institute (ACI), P.O. Box 9094, FarmingtonHills, MI 48333.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.embedded cords or stra
16、nds of fiber running in both directionsand not more than 32 mm (114 in.) apart. The paper shall belight in color, shall be free of visible defects, and shall have auniform appearance. White paper shall have a white surface onat least one side.6.1.1 The tensile strength of curing paper shall be no le
17、ssthan 5.25 kN/m of width (30 lbf/in. of width ) in the machinedirection and 2.62 kN/m of width (15 lbf/in. of width) in thecross direction when measured according to Test MethodsD 829.6.2 Polyethylene Film shall consist of a single sheet manu-factured from polyethylene resins. It shall be free of v
18、isibledefects 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 polyethylene film shall beno less than 0.10 mm (4 mil) as determined according toSpecification D 4397 . Thickness at any point
19、shall be no lessthan 0.075 mm (0.0030 in.).6.2.2 The impact resistance and mechanical properties shallbe as required in Specification D 4397.6.3 White Burlap-Polyethylene Sheeting shall consist ofburlap weighing not less than 305 g/m2(9 oz./yd2) extrusioncoated on one side with white opaque polyethy
20、lene at least0.10 mm (0.004 in.) thick and meeting the other requirementsof 6.2. The polyethylene material shall be securely bonded tothe burlap so that there will be no separation of the materialsduring handling and curing of the concrete.7. Sampling7.1 Samples of film or sheeting sufficient to det
21、ermineconformance 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 CHANGESCommittee C09 has identified the location of selected changes to this st
22、andard since the last issue (C 171-97a)that may impact the use of this standard.(1) New section 5.2 changes the method of test for waterretention of sheet material. Test Method E 96 is specified witha required WVTR of no more than 10 g/m2in 24 h. Previousversions specified Test Method C 156 with moi
23、sture loss of nomore than 0.55 kg/m2in 72 h.ASTM International takes no position respecting the validity of 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
24、 the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to 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 revisio
25、n of this standard or for additional standardsand should be addressed to ASTM International Headquarters. 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 sho
26、uldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C171032
