Shreesh Shrivastav Dept of Civil Engineering - Answers

Steps to measure the rate of Spray of Prime Coat in Road Construction are:

1. You have to take sample tray of suitable size. I would prefer use tray of Size 35 cm * 28 cm.
2. Weight the tray in weighing balance. Say initial weight of tray= A kg
3. Place the tray over the road on which prime coat is to be sprayed and hence the prime coat is sprayed over the tray.
4. Let the prime coat dry for some time and weight the tray over which prime coat is sprayed. Say Final weight of Tray(with the prime coat)= B kg
5. Calculations to be done:
6. Area of tray = 0.35 *0.28 =0.098 sq/m
7. Initial Weight of Tray= A kg
8. Final Weight of Tray= B kg
9. Specific Gravity of Prime Coat= 0.95
10. Calculate increase in Weight= (B-A) kg
11. Rate of Spray in Kg = (Increase in Weight)/(Area of tray)
12. Unit of Rate of Spray in kg/sqm.(Kilogram per square meter)