The penetration value of residue from distillation upto 360°C of rapid curing cutbacks bitumen is -
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A.
80 to 120
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B.
30 to 120
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C.
40 to 80
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D.
100 to 160
Correct Answer:
A. 80 to 120
Explanation:
The correct penetration value for the residue of rapid curing (RC) cutback bitumen after distillation to 360°C typically falls within the range of 80 to 120. Rapid curing cutbacks are created by blending penetration-grade bitumen with a high-volatility solvent like gasoline or naphtha. According to standard technical specifications (such as ASTM), once the volatile components are evaporated during the distillation process, the remaining bituminous residue should return to a consistency similar to its original penetration grade, which for most RC grades is standardized between 80 and 120 dmm at 25°C.
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