Volume-IF - JantERmantER

3.5.0 Tack Coat
3.5.1 Description
3.5.2 Materials
DCPL-K4A02
traffic from using the completed water bound macadam course if in his
opinion it would cause excessive damage to the surface.
The work shall consist of application of a single coat of low viscosity liquid
bituminous material to an existing road surface preparatory to another
bituminous construction.
Binder : The binder used for tack coat shall be bitumen of a suitable
grade as directed by the Engineer and conforming to IS:73, 217 or 454, as
applicable, or any other approved cutback.
3.5.3 Construction Operations
3.5.3.1 Preparation of Base
The surface on which the tack coat is to be applied shall be thoroughly
swept and scraped clean of dust and any other extraneous material before
the application of the binder.
3.5.3.2 Application of Binder
Binder shall be heated to the temperature appropriate to the grade of bitumen
used and approved by the Engineer and sprayed on the base at the rate
specified below. The rate of spread in terms of straight-run bitumen shall be
5 kg. per 10 square metre area for an existing bitumen treated surface and
10 kg per 10 square metre area for an untreated water bound macadam
surface. The binder shall be supplied uniformly with the aid of sprayers.
The tack coat shall be applied just ahead of the on-coming bituminous
construction.
3.6.0 Bituminous Macadam Binder Course
3.6.1 Description
3.6.2 Materials
3.6.2.1 Binder
This work shall consist of construction, in a single course, of 50 mm / 75 mm
thickness of compacted crushed aggregates premixed with a bituminous binder, laid
immediately after mixing, on a base prepared previously in accordance with the
requirements of these Specifications, and in conformity with the lines, grades and
cross sections shown on the drawings or directed by the Engineer.
(PCA.775.S034sca7) V.II-D2/S-VII : 14