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how to calculate the rate of spray of prime coat in road construction.

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Asked: September 19, 20202020-09-19T23:02:47+05:30 2020-09-19T23:02:47+05:30In: Miscellaneous
aviratdhodare
aviratdhodare

aviratdhodare

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aviratdhodare

 how to calculate the rate of spray of prime coat in road construction. 

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  1. aviratdhodare

    aviratdhodare

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    aviratdhodare
    2020-09-25T16:08:16+05:30Added an answer on September 25, 2020 at 4:08 pm

    Tray Test is used to calculate the rate of spread of prime or tack coat. The test uses a 20cm X 20 cm X 3 cm tray placed on the surface to be primed at some intervals in the path of the sprayer/emulsion distributor. They are placed between the wheel’s path/tracks.

    5 samples are collected for a test and a minimum of 3 tests are conducted for a day of work.

    Weight of the emulsion on the tray is calculated by finding the difference in the final and the initial weight of the tray. Weight per unit sq.m or weight per 10 sq.m is obtained and checked with specified limits mentioned in MORT&H Table 500–3 (prime coat) and 500–5 (Tack coat) or other relevant IRC specifications.

    Initially before the start of the priming work, a demonstration trial is done based on the following parameters:

    1. Equipment type for spraying operation
    2. Size of nozzle
    3. Pressure at spray bar
    4. Speed of forward movement of sprayer equipment.

    Above values are ascertained and calibrated for a required rate of spray as per the specification by using tray test prior to the start of actual work.

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  2. Shreesh Shrivastav Dept of Civil Engineering

    Shreesh Shrivastav Dept of Civil Engineering

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    Shreesh Shrivastav Dept of Civil Engineering User
    2020-09-22T13:53:50+05:30Added an answer on September 22, 2020 at 1:53 pm

    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)
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