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Q: For road pavements, the cement generally used is
  • A. ordinary portland cement
  • B. rapid hardening cement
  • C. low heat cement
  • D. blast furnace slag cement
Correct Answer: Option B - For road pavements, the cement generally used is rapid hardening cement. It is suitable for repair of roads and bridges and when load is applied in a short period of time. • Rapid hardening Portland cement (IS : 8041) has high lime content and can be obtained by increasing the C3S content but is normally obtained from OPC clinker by finer grinding. Initial setting time – 30 Minutes (minimum) Final setting time– 10 Hours (Maximum) Compressive strength– 1 day – 16 N/mm² 3 day – 27.5 N/mm² • Surface area of particles – 3250 cm²/gm
B. For road pavements, the cement generally used is rapid hardening cement. It is suitable for repair of roads and bridges and when load is applied in a short period of time. • Rapid hardening Portland cement (IS : 8041) has high lime content and can be obtained by increasing the C3S content but is normally obtained from OPC clinker by finer grinding. Initial setting time – 30 Minutes (minimum) Final setting time– 10 Hours (Maximum) Compressive strength– 1 day – 16 N/mm² 3 day – 27.5 N/mm² • Surface area of particles – 3250 cm²/gm

Explanations:

For road pavements, the cement generally used is rapid hardening cement. It is suitable for repair of roads and bridges and when load is applied in a short period of time. • Rapid hardening Portland cement (IS : 8041) has high lime content and can be obtained by increasing the C3S content but is normally obtained from OPC clinker by finer grinding. Initial setting time – 30 Minutes (minimum) Final setting time– 10 Hours (Maximum) Compressive strength– 1 day – 16 N/mm² 3 day – 27.5 N/mm² • Surface area of particles – 3250 cm²/gm