Item 303 Bituminous Seal Coat

通報

問題一覧

Quantity for bituminous material (L/m2) for seal coat, Type 1

0.20 to 0.50

Quantity for bituminous material (L/m2) for seal coat, Type 2

0.51 to 1.00

Quantity for bituminous material (L/m2) for seal coat, Type 3

1.01 to 1.50

Quantity of cover aggregate (kg/sq.m) for seal coat, Type 1

None

Quantity of cover aggregate (kg/sq.m) for seal coat, Type 2

5.00 to 10.00

Quantity of cover aggregate (kg/sq.m) for seal coat, Type 3

10.01 to 14.00

The cover aggregate for _____ seal coat shall consist of sand and fine screenings, reasonably free from dirt or other organic matter.

Type 2

Aggregate for ____ seal coat shall be crushed stone, crushed slag, or crushed gravel.

Type 3

Cover aggregate shall have a mass percent of wear not exceeding _____ according to Los Angeles Abrasion Test.

In cover aggregate, when crushed slag is used, it shall be of uniform density and quality and shall have a density of not less than ____.

960 kg/cu.m

In no event seal coat shall be placed on a newly constructed or reconditioned surfaces in less than ____ after such surface is laid and opened to traffic, unless ordered in written by the engineer.

10 days

For asphalt cement, bituminous material shall be applied by means of pressure distributor at the rate of approximately

0.9 to 1.8 liters

For cutback asphalt, bituminous material shall be applied by means of pressure distributor at the rate of approximately ____ per square meter of surface, in a uniform unbroken spread over the section to be treated.

1.5 to 3.0 liters

The pressure distributor shall be equipped with a _______ registering the speed and so located as to be visible to the truck driver.

fifth wheel tacometer

The distributor pump shall be equipped with a gauge registering ______ passing through the nozzles and readily visible to the operator.

liters per minute

The application of bituminous material at the junction of spreads is not in excess of the specified quantities, any excess shall be removed from the surface by a:

squeegee

If necessary, to obtain proper junction of spreads, a strip of manila paper approximately ____ wide and at least as long as the spray bar shall be used at the beginning and end of each spread.

Immediately after the application of asphalt, the cover aggregate shall be evenly spread over the surface at the rate of approximately _________ per sq.m

0.004 to 0.007 cu.m

As soon as the cover aggregate has been spread, the spread shall be broomed lightly with an approved push or drag broom to insure an even distribution, and shall then be rolled with an approved power roller weighing not less than ____, nor more than ____ to a uniform surface.

5 tonnes, 6 tonnes

The quantities of bituminous material and cover aggregate shall be measured by _____, calculated by the actual size of application approved by the engineer.

tonne

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