SECTION 220—CONCRETE CURING MATERIALS
220.01 Description
These specifications cover materials used to maintain the humidity and temperature of freshly placed concrete to ensure satisfactory hydration and proper hardening of the concrete.
220.02 Detail Requirements
Concrete curing materials shall consist of waterproof paper, polyethylene (PE) film, a combination of burlap and PE film, liquid membrane-forming compound, or water. Concrete curing materials shall be free from impurities that may be detrimental to the surface of concrete or the proper curing of concrete.
a.Waterproof paper shall conform to AASHTO M171. One side shall be composed of white, light- reflecting paper.
b.PE film shall conform to AASHTO M171 except that its nominal thickness shall be 3.0 mils. The thickness at any point shall be at least 2.5 mils.
c.Burlap and PE film may be used in combination. They shall be bonded securely so that they cannot be easily separated in a dry or saturated condition. White PE film shall conform to the reflectance requirements of AASHTO M171. Burlap shall conform to AASHTO M182, Class 3. The combination product shall have a total weight of 11 ounces per square yard with 11 threads of burlap per inch.
d.Liquid membrane-forming compounds shall be used on concrete masonry except bridge substructure elements. Fugitive dye compounds shall be used on bridge substructure elements. The Contractor shall protect concrete surfaces or remove liquid membrane-forming compound from concrete surfaces to which a bonding compound, joint sealer, or waterproofing material is to be applied. Liquid membrane-forming compounds will be tested in accordance with VTM-2 and shall conform to the following: 220.02
Concrete Curing Materials in other states
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Source: Road and Bridge Specifications, 2020 Edition. Pages 245–245 of 1,065. View official source ↗