Section 4105. �Liquid Curing Compounds

4105.01���� general requirements.

Comply with AASHTO M 148 and the following requirements.

4105.02���� SPRAYABILITY.

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).

4105.03���� MOISTURE RETENTION.

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.

4105.04���� DRYING TIME.

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.

4105.05���� WHITE PIGMENTED COMPOUNDS.

A.��� Use compounds consisting of finely ground white pigment and vehicle, ready mixed for use without alteration.

B.��� Ensure the pigment does not:

� Settle excessively or cake in the container, and

� Thicken in storage to cause a change in consistency which may result in a nonuniform spray.

C.��� Use a compound that after being sprayed on a test slab and drying has an apparent daylight reflectance no less than 60% relative to magnesium oxide.

D.��� Agitate the compound just prior to it being removed from the container. Agitate it continuously during application.

4105.06���� DARK COLORED COMPOUNDS.

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)).

4105.07���� CLEAR COMPOUNDS.

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.

4105.08���� CARRYOVER STOCK.

A.��� Approvals of individual lots of curing compound are valid for the year in which the compound is manufactured.

B.��� Lots of 5 barrels (1000 L) or more of white pigmented compound which have been carried over the winter will be retested if stored in a heated warehouse.

C.��� Do not use carryover lots of white pigmented compound less than 5 barrels (1000 L).

D.��� Do not use carryover lots of curing compounds which have been frozen.