Correct option is D
→ Concrete surfaces exposed to alternate wetting & drying it’s a severe exposure condition
→ The surface member is in tidal zone the exposure condition is extreme condition,
→ Concrete surfaces exposed to alternate wetting & drying it’s a severe exposure condition
→ The surface member is in tidal zone the exposure condition is extreme condition,
The minimum density (g/cc) of corrugated and semi-corrugated asbestos cement sheets considered acceptable for construction purposes by the Indian standard is: