ASTM C309 − 11 Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete

Scope of ASTM C309 − 11 Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete

1.1 This specification covers liquid membrane-forming compounds suitable for application to concrete surfaces to reduce the loss of water during the early-hardening period.

White-pigmented membrane-forming compounds serve the additional purpose of reducing the temperature rise in concrete exposed to radiation from the sun.

The membrane-forming compounds covered by this specification are suitable for use as curing media for fresh concrete and may also be used for further curing of concrete after removal of forms or after initial moist curing.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for informational purposes only.

Classification of ASTM C309 − 11 Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete

3.1 The following types of liquid membrane-forming compounds are included:
3.1.1 Type 1—Clear or translucent without dye,
3.1.2 Type 1-D—Clear or translucent with fugitive dye, and
3.1.3 Type 2—White pigmented.
3.2 The solids dissolved in the vehicle shall be one of the following classes:
3.2.1 Class A—No restrictions,
3.2.2 Class B—Must be a resin as defined in Terminology D883.

NOTE 3—Permanent colors other than white, or other special attributes, are beyond the scope of this specification and are subject to negotiation between the purchaser and the supplier