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Q. Function of prime coat in bituminous pavement?
The main function of prime coat in bituminous pavement is to protect the subgrade from weathering andmoisture. Because the presence of moisture affects the strength of subgrade, prevention of water entry at the time of construction is essential to avoid the failure of the pavement. In cold countries, by getting rid of moisture from subgrade, danger of frost heave can be minimized.
Prime coat is an asphalt that, when applied evenly to the surface of subgrade orsub-base, serves to seal the surface to hinder the penetration of moisture into subgrade. Vehicular traffic must be avoided on the surface sprayed with prime coat since the traction and tearing action of vehicles would damage this asphalt layer.
Fig: Position of application of prime coat
Widening on Curves: Pavements have to be widened on curves because of the fact that : (a) the vehicle has a wheel base and overhang on the front and rear, and the vehicle
find the equation of the line with slope 4 and passing through the point of intersection of the line x+6y-4=0 ad 3x-4y+2=10
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Purification and Treatment of Water: In purification and treatment of water, we have discussed the important treatment process which is commonly used in making raw water from
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