ASTM C171 − 07 Standard Specification for Sheet Materials for Curing Concrete

Scope of ASTM C171 − 07 Standard Specification for Sheet Materials for Curing Concrete

1.1 This specification covers materials in sheet form used for covering the surfaces of hydraulic cement concrete to inhibit moisture loss during the curing period and, in the case of the white reflective type materials, to also reduce temperature rise in concrete exposed to radiation from the sun. The following types are included:

1.1.1 Curing Paper:

1.1.1.1 Regular.

1.1.1.2 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 the standard. Inch-pound units are provided in parentheses for information only.

Physical Requirements of ASTM C171 − 07 Standard Specification for Sheet Materials for Curing Concrete

6.1 Curing 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 32 mm (11⁄4 in.) 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.

6.1.1 The tensile strength of curing paper shall be no less than 5.25 kN/m of width (30 lbf/in. of width ) in the machine direction and 2.62 kN/m of width (15 lbf/in. of width) in the cross direction when measured according to Test Methods D829.