Cutback asphalts

Cutback Asphalts

Petroleum solvents used for dissolving asphalt cement are variously called distillate, diluent, or cutter stock. If the solvent used in making the cutback asphalt is highly volatile, it will quickly escape by evaporation. Solvents of lower volatility evaporate more slowly. On the basis of the relative speed of evaporation, cutback asphalts are divided into three types:

1. Rapid-curing (RC)-asphalt cement and a light diluent of high volatility, generally in the gasoline or naphtha boiling point range (RC-70, 250, 800, 3000);

2. Medium-curing (MC)-asphalt cement and medium diluent of intermediate volatility generally in the kerosene boiling point range (MC-30, 70, 250, 800, 3000); and

3. Slow-curing (SC)-asphalt cement and oils of low volatility (SC-70, 250, 800, 3000).
Slow-curing (SC) cutback asphalts are often called road-oils. This term originated in earlier days when asphalt residual oil was used to give roads a lowcost, all weather surface.

The degree of liquidity developed in each case depends principally on the proportion of solvent to asphalt cement. To a minor degree, the liquidity of the cutback may be affected by the hardness of the base asphalt from which the cutback is made. The degree of fluidity results in several grades of cutback asphalt some quite fluid at ordinary temperatures, and others somewhat more viscous. The more viscous grades may require a small amount of heating to make them fluid enough for construction operations.

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