Surface Treatment
Bituminous materials and aggregate are combined
in various proportions to obtain the most satisfactory
surface for a given situation. Accurate estimates are
required to avoid production delays because of
inadequate supplies. You also want to avoid oversupply
and waste of materials.
The formulas for estimating supplies for a single-
surface treatment are as follows:
For computing pounds:
For computing tons:
determined by the same method as above except the
The materials for a multiple-surface treatment are
application rate of the binder and the aggregate, and the
size of the aggregate for the second lift is one half of that
of the first lift.
Example: A test strip with an area of 100 square
yards was used to determine the quantities for a
single-surface treatment. Careful control was made of
materials. A check of materials consumed showed that
1.50 tons of aggregate was used. Based on previous
experience, an aggregate loss of 10 percent (0. 10) and a
bitumen loss of 5 percent (0.05) are expected. Find the
tons of aggregate and gallons of bitumen necessary to
make a double-surface treatment on a road 24 feet wide
and 10 miles long.
8-30
