Lesson 2/Learning Event 1
where:
G = gallons of bitumen primer
D = drums of bitumen primer
L = length of treated section in feet. (Miles may be converted by multiplying by 5,280)
W = width of treated surface in feet
ARB = rate of application of bitumen in gallons per square yard
LF = loss factor bitumen = 5% or 1.05
9 = square feet pet yard conversion factor
53 = gallons per drum
Example: The specifications and other data for a prime coat project are as follows:
L = 3 miles = 3 x 5280 = 15,480 feet
W = 24 feet
ARB = 0.3 gal/sq yd
LF = 5 percent (or) 1.05
Find the number of gallons of bitumen (G) necessary to do this project
SOLUTION:
= 14414.4 6 14,415 gallons.
TACK COAT
A tack coat is a coating of asphalt on an existing paved surface that provides a bond between the
existing surface and the new surface. The two essential properties of a tack coat are: (1) it must be very
thin; and (2) it must uni-
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