Specification Part 3 - Road & Bridge Works - Urban Administration ...

503.4.4. Curing of tack coat:
(i)The tack coat shall be left to cure until all the volatiles have evaporated before any subsequent
construction is started.
(ii)No plant or vehicles shall be allowed on the tack coat other than those essential for the
construction.
503.5. Quality Control of Work
For control of the quality of materials supplied and the works carried out, the relevant provisions
of clause 501.8.4.1shall apply.
503.6. Arrangements for Traffic
During the period of construction, arrangements for traffic shall be made in accordance with the
provisions and as per the direction of the Engineer in charge.
503.7. Measurement for Payment
Tack coat shall be measured in terms of surface area to application in square meters.
503.8. Rate
The contract unit rate for tack coat shall be payment in full for carrying out the required operations
including for all components listed in Clause 401.8 (i) to (v) of the Ministry’s Specification for
Road and Bridge Works (third revision) 1995 and as applicable to the work specified in these
Specifications. The rate shall cover the provision of tack coat at 0.2 kg per square meter, with the
provision that the variance in actual quantity of bitumen used will be assessed and t he payment
adjusted accordingly.
504. BITUMINOUS MACADAM
504.1. General
Bituminous macadam work shall consist of construction in a single course having 50mm to
100mm thickness or in multiple courses of compacted crushed aggregates premixed with a
bituminous binder on a previously prepared base.
504.1. Materials
504.2.1. Bitumen: The bitumen shall be paving bitumen of Penetration Grade complying with
Indian Standard Specifications for "Paving Bitumen" IS: 73, and of the penetrate on indicated in
Table given below
TABLE 500-4
Composition of Bituminous Macadam
Mix designation Nominal
aggregate size Layer thickness
Grading 1
40 mm
80 - 100 mm
Grading 2
19 mm
50 - 75 mm
IS Sieve (mm)
Cumulative % by weight of total aggregate passing
45 100
37.5 90 - 100
26.5 75 - 100 100
19 - 90 - 100
13.2 35 - 61 56 - 88
4.75 13 - 22 16 - 36
2.36 4 - 19 4 - 19
0.3 2 - 10 2 - 10
0.075 0 - 8 0 - 8
Bitumen content, % by weight 3.1 - 3.4 3.3 - 3.5
of total mixture
Bitumen grade 35 to 90 35 to 90
Notes: 1.Appropriate bitumen contents for conditions in cooler areas of India may be up to 0.5%
higher subject to the approval of the Engineer in charge