Designation:C171–07
Standard Specification for
Sheet Materials for Curing Concrete1
This standard is issued under thefixed designation C171;the number immediately following the designation indicates the year of original adoption or,in the ca of revision,the year of last revision.A number in parenthes indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.
This standard has been approved for u by agencies of the Department of Defen.
1.Scope*
1.1This specification covers materials in sheet form ud for covering the surfaces of hydraulic cement concrete to inhibit moisture loss during the curing period and,in the ca of the white reflective type materials,to also reduce tempera-ture ri in concrete expod to radiation from the sun.The following types are included:
1.1.1Curing Paper:
1.1.1.1Regular.
1.1.1.2White.
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1.1.2Polyethylene Film:
1.1.
2.1Clear.
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2.2White Opaque.
1.1.3White-Burlap-Polyethylene Sheet.
1.2The values stated in SI units are to be regarded as the standard.Inch-pound units are provided in parenthes for information only.
N OTE1—This specification does not cover materials such as burlap, cotton mats,or rugs ud with additional applications of water to maintain a water-saturated environment on such surfaces.Procedures employing the materials are discusd in ACI308R.Sheet materials having additional characteristics such as insulating properties and the ability to carry additional water to the curing region are commercially available but are not currently addresd in this specification.
1.3The text of this standard references notes and footnotes which provide explanatory material.The notes and footnotes shall not be considered as requirements of the standard.
2.Referenced Documents
2.1ASTM Standards:2
C156Test Method for Water Retention by Liquid Membrane-Forming Curing Compounds for Concrete
D829Test Methods for Wet Tensile Breaking Strength of Paper and Paper Products
D4397Specification for Polyethylene Sheeting for Con-struction,Industrial,and Agricultural Applications
E96/E96M Test Methods for Water Vapor Transmission of Materials
E1347Test Method for Color and Color-Difference Mea-surement by Tristimulus Colorimetry
2.2ACI Standard:
ACI308R Standard Practice for Curing Concrete3
3.Terminology
3.1Definitions:
弥留什么意思3.1.1curing paper,n—a composite consisting of two layers of kraft paper bonded together with a bitu英文字母发音
minous material and reinforced withfiber,ud for covering the surface of fresh concrete to inhibit moisture loss during the curing period.
4.Ordering Information
4.1The purchar shall specify the type of curing material to be furnished under this specification.
4.2Lengths and widths of the rolls or mats of the sheet materials furnished shall be as agreed upon between the purchar and ller.
5.Performance Requirements
5.1The sheet materials furnished under this specification shall be tough,strong,resilient,and capable of withstanding normal job u without puncturing or tearing.
5.2The sheet material shall exhibit a water vapor transmis-sion rate(WVTR)of no more than10g/m2in24h when tested according to Test Methods E96/E96M using the Water Method in the environment(test cabinet)specified in Test Method C15
6.
5.3The daylight reflectance of the white side of white curing paper shall be at least50%when measured by Test Method E1347.The daylight reflectance of white polyethylene film and the polyethylene side of white burlap-polyethylene sheet shall be at least70%when measured according to Test Method E1347.
N OTE2—Daylight reflectance is total luminous reflectance factor,CIE
1This specification is under the jurisdiction of ASTM Committee C09on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.22on Materials Applied to New Concrete Surfaces.
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Current edition approved Nov.1,2007.Published December2007.Originally approved in1942.Last previous edition approved in2003as C171–03.
2For referenced ASTM standards,visit the ASTM website,www.astm,or contact ASTM Customer Service at rvice@astm.For Annual Book of ASTM
Standards volume information,refer to the standard’s Document Summary page on the ASTM website.
3Available from American Concrete Institute(ACI),P.O.Box9094,Farmington Hills,MI48333-9094,www.aci-int.
*A Summary of Changes ction appears at the end of this standard. Copyright©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States. --`,`,,`````,,,,`,`,,`,,,,```-`-`,,`,,`,`,,`---
tristimulus value Y for the CIE 1931(2°)standard obrver and CIE standard illuminant C or D65.
6.Physical Requirements
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6.1Curing Paper shall consist of two sheets of kraft paper cemented together with a bituminous material in which are embedded cords or strands of fiber running in both directions and not more than 32mm (11⁄4in.)apart.The paper shall be light in color,shall be free of visible defects,and shall have a uniform appearance.White paper shall have a white surface on at least one side.
doubtful6.1.1The tensile strength of curing paper shall be no less than 5.25kN/m of width (30lbf/in.of width )in the machine direction and 2.62kN/m of width (15lbf/in.of width)in the cross direction when measured according to Test Methods D 829.
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6.2Polyethylene Film shall consist of a single sheet manu-factured from polyethylene resins.It shall be free of visible defects and shall have a uniform appearance.The clear type shall be esntially transparent.The opaque film shall contain white pigment.
6.2.1The nominal thickness of polyethylene film shall be no less than 0.10mm (4mil)as determined according to Specification D 439
7.Thickness at any point shall be no less than 0.075mm (0.0030in.).
6.2.2The impact resistance and mechanical properties shall be as required in Specification D 439
7.
6.3White Burlap-Polyethylene Sheeting shall consist of burlap weighing not less than 305g/m 2(9oz./yd 2)extrusion coated on one side with white opaque polyethylene at least 0.10mm (0.004in.)thick and meeting the other requirements of 6.2.The polyethylene material shall be curely bonded to the burlap so that there will be no paration of the materials during handling and curing of the concrete.
7.Sampling
7.1Samples of film or sheeting sufficient to determine conformance with this specification shall be taken at random.8.Keywords
不要介意 英文8.1concrete curing materials;polyethylene film;sheet ma-terial for curing concrete;curing paper;white burlap-polyethylene sheet
SUMMARY OF CHANGES
Committee C09has identified the location of lected changes to this specification since the last issue,C 171–03,that may impact the u of this specification.(Approved November 1,2007)
(1)Revid 5.2to clarify test conditions to be ud for Test Methods E 96/E 96M .
ASTM International takes no position respecting the validity of any patent rights asrted in connection with any item mentioned in this standard.Urs of this standard are expressly advid that determination of the validity of any such patent rights,and the risk of 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 and if not revid,either reapproved or withdrawn.Your comments are invit
ed either for revision of this standard or for additional standards and should be addresd to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of the responsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards,at the address shown below.
spaceshipThis standard is copyrighted by ASTM International,100Barr 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 above address or at 610-832-9585(phone),610-832-9555(fax),or rvice@astm (e-mail);or through the ASTM website
(www.astm).
C 171–07
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