Section 4105. Liquid Curing Compounds
Comply with AASHTO M 148 and the following requirements.
Use compounds of a consistency that they can be readily applied by spraying to a uniform coating at a material temperature above 40°F (4°C).
White pigmented liquid curing compounds, when tested in accordance with ASTM C 156 using an application rate of 200 square feet per gallon (5 m2/L) shall restrict the loss of water to not more than 0.20 kg/m2 in 24 hours or 0.40 kg/m2 in 72 hours.
Use liquid curing compounds that:
· Dry to the touch in no more than 4 hours, and
· Do not track off the concrete when walked upon after 12 hours.
· Settle excessively or cake in the container, and
· Thicken in storage to cause a change in consistency which may result in a nonuniform spray.
Use asphalt emulsion or asphalt cut back with a volatile solvent. Use a mixture containing no less than 50.0% asphalt. Use an application rate of no less than 0.08 gallon per square yard (0.36 L/m2) (12.5 square yards per gallon (2.8 m2/L)).
Apply the following in lieu of other requirements of this section:
A. Use clear liquid membrane curing compounds complying with the requirements of AASHTO M 148, Type 1-D, Class A. Use only one type of compound on a structure. Do not use different compounds on the same structure.
B. Inspection and acceptance of clear compounds for curing will be according to Materials I.M. 405.07.