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ASTM C 309 Document Information:
Title
Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete
ASTM International
Publication Date:
Jun 1, 2007
Scope:
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.
NOTE 1—This specification addresses only those properties listed
in Sections 5 through 8. Membrane-forming compounds with special
properties including better water retention, minimum solids
content, resistance to ultraviolet radiation, acid and alkali
resistance and non-interference with adhesives are described in
Specification C 1315.
NOTE 2—Solutions of silicate salts are chemically reactive in
concrete rather than membrane-forming; therefore, they do not meet
the intent of this specification.
The values stated in SI units are to be regarded as the
standard. The values given in parentheses are provided for
informational purposes only.
The following precautionary caveat pertains only to the test
methods portion, Section 10, of this specification: This
standard does not purport to address all of the safety concerns, if
any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety and health
practices and determine the applicability of regulatory limitations
prior to use.
The text of this standard references notes and footnotes which
provide explanatory material. These notes and footnotes shall not
be considered as requirements of the standard.
This is a performance specification. The allowable composition
of products covered by this specification is limited by various
local, regional, and national regulations. Issues related to air
quality (solvent emission), worker exposure, and other hazards are
not addressed here. It is the responsibility of the producers and
users of these materials to comply with pertinent regulations.
Warning—Some VOC exempt solvents used to meet
the regulations are extremely flammable with low auto ignition
temperatures and rapid evaporation rates. Consult the
manufacturer's product information sheet for important application
and safety information.
*A Summary of Changes section appears at the end of this
standard.
Keywords:
- concrete curing
- liquid membrane-forming compounds for curing concrete
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