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

(ii)The actual volume of the aggregates to be paid for shall be computed after deducting the
specified percentages in Table 500-28, from the volume computed by stack measurements, to
allow for bulking.
(iii)Unless otherwise directed by the Engineer in charge, measurements shall not be taken until
sufficient materials for use on the road have been collected and stacked. (iv)Immediately after
measurement, the stacks shall be marked by white wash or other means as directed by the
Engineer in charge. Stone filler as delivered to the site shall be measured in tonnes.
TAKLE 500-28.
PER CENT REDUCTION IN VOLUME OF AGGREGATES
S. No. Standard size
of aggregates
Percentage reduction in volume
computed by stack measurements to
arrive at the volume to be paid for
1. 75 mm and 63 mm 12.5
2. 45 mm and 26.5 mm 10.0
3. 22.4 mm, 13.2 mm, 11.2 mm and 6.7 mm 5.0
4. Fine aggregate 5.0
514.6. Rates
The contract unit rates for different sizes of coarse aggregate, fine aggregate and stone filler shall
be payment in full for collecting, conveying and stacking or storing at the site including full
compensation for:
(i) All royalties, fees, rents where necessary;
(ii) All leads and lifts; and
(iii)All labour, tools, equipment and incidentals to complete the work to the Specifications.
(iv) All necessary testing of material, both initial, to approve the source, and regular control testing
thereafter.
515. MASTIC ASPHALT
515.1. General
(i)This work shall consist of constructing a single layer of mastic asphalt wearing course for road
pavements and bridge decks.
(ii)Mastic asphalt is an intimate homogeneous mixture of selected well graded aggregates, filler
and bitumen in such proportions as to yield a plastic and void less mass, which when applied hot
can be toweled and floated to form a very dense impermeable surfacing.
515.2. Materials
515.2.1. Binder:
(i)Subject to the approval of the Engineer in charge, the binder shall be a paving grade bitumen
meeting the requirements given in Table 500-29.
515.2.2. Coarse aggregate:
(i)The coarse aggregate shall consist of crushed stone, crushed gravel/shingle or other stones.
(ii)They shall be clean, hard, durable, of fairly cubical shape, uncoated and free from soft, organic
or other deleterious substances. They shall satisfy the physical.
TABLE 500-29.
REQUIREMENTS FOR PHYSICAL PROPERTIES OF BINDER
Property Unit Test method Requirement
Penetration at 25°C IS 1203 15 ±5*
Softening point. °C IS 1205 65 ± 10
Loss on heating for 5h
at 163°C, % by mass
Max IS 1212 2.0
Solubility in
trichloroethylene, %
Min IS 1216 95
by mass
Ash (mineral matter),
% by mass
Max IS 1217 1.0