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

(vi)The mix shall be immediately transported from the mixing plant to the point of use and spread
uniformly on the bituminous surface to be sealed.
(vii)As soon as a sufficient length has been covered with the premixed material, the surface shall
be rolled with an 8-10 tonne smooth-wheeled roller.
(viii)Rolling shall be continued until the premixed material completely seals the voids in the
bituminous course and a smooth uniform surface is obtained.
513.4. Opening to Traffic
(i)In the case of Type B seal coat, traffic may be allowed soon after final rolling when the
premixed material has cooled down to the surrounding temperature.
(ii)In the case of Type A seal coat, traffic shall not be permitted to run on any newly sealed ar ea
until the following day.
(iii)In special circumstances, however, the Engineer in charge may open the road to traffic
immediately after rolling, but in such cases traffic speed shall be rigorously limited to 16 km per
hour until the following day.
513.5. Surface Finish and Quality Control of Work
(i)The surface finish of construction shall conform to the requirements of Clause 902.
(ii)For control on the quality of materials supplied and the works carried out, the relevant
provisions of clause of 501.8.4.1.
513.6. Arrangements for Traffic
During the period of construction, arrangements for traffic shall be made by as per direction of
Engineer in charge.
513.7. Measurement for Payment
Seal coat, Type A or B shall be measured as finished work, over the area specified to be covered,
in square meters at the thickness specified in the Contract.
513.8. Rate
The contract unit rate for seal coat Type A or B shall be payment in full for carrying out the
required operations including full compensation for all components listed in Clause 501.8.8.2. (i)
to (xi).
514. SUPPLY OF STONE AGGREGATESFOR PAVEMENT COURSES
514.1. General
(i)This Specification Clause shall apply to the supply of stone aggregates only.
(ii)The work shall consist only of collection, transportation and stacking the stone aggregates and
stone filler for subsequent use in pavement courses.
(iii)The actual work of laying the pavement courses shall, however, be governed by the individual
Specification Clause for the actual work, given elsewhere in this Specification. (iv)The size and
quantities of the aggregates to be supplied shall be so selected by the Engineer in charge that the
grading requirements set forth in the individual Specification Clauses for the pavement courses,
for which the supply is intended, are satisfied.
(v)All the materials shall be procured from approved sources and shall conform to the physical
requirements, specified in the respective Specification Clauses for the individual items given
elsewhere in this Specification.
514.2. Sizes of Stone Aggregates
The stone aggregates shall be designated by their standard sizes in the Contract and shall
conform to the requirements shown in Table 500-27.
TABLE 500-27.
SIZE REQUIREMENTS FOR COARSE STONE AGGREGATES