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

522.2. Materials
522.2.1. Binder: Binder shall be a modified binder complying with the requirements of Clause
523, according to the requirements of the Contract, except that paving grade bitumen of 80 -100
penetration complying with the requirements of IS: 73 shall be used in the case of a bitumen
impregnated geotextile.
522.2.2. Aggregate:
(i)The requirements of Clause 510.2.2 apply except that the Polished Stone Value requirement
does not apply in the case of a SAMI. Where required by the contract, aggregate shall be precoated
using either of the techniques permitted by Clause 510.2.5.
522.2.3. Rates of spread of binder and aggregate: The rates of spread of binder and aggregate
shall be according to one of the size alternatives in Table 500-47, as required by the Contract.
522.2.4. Geotextile: The use of geotextile as prescribed for SI. No. 7 in Table 500-47 shall
conform to the requirements of Clause 704.3.
522.3. Construction Operations
522.3.1. Weather and seasonal limitations: Clause 501.5.1 shall apply.
522.3.2. Preparation of base:
(i)The base on which the SAM, SAMI or bitumen impregnated geotextile is to be laid shall be
prepared, in accordance with Clause 501 and as directed by the Engineer in charge.
(ii)The surface shall be thoroughly cleaned either by using a mechanical brush or any other
equipment / method approved by the Engineer in charge. Dust removed in the process shall be
blown off with compressed air.
522.3.3. Application of binder:
(i)The equipment and general procedures shall all be in accordance with the Manual for
Construction and Supervision of Bituminous Works.
(ii)The application temperature for modified binder shall be 160-170°C. Binder for bitumen
impregnated
TABLE 500-47.
QUANTITY OK MATERIALS REQUIRED FOR 10 SQ.M. OK ROAD SURFACE FOR STRESS
ABSORBING MEMBRANE
SI.
No
1
2
3
Type and Width of Crack
Hair cracks and map crack
up to 3mm width
Map cracks or alligator
cracks 3mm to 6mm width
Map cracks or alligator
cracks 6mm to 9mm width
4 Cracks above 9mm width cracked
area above 50%
Specification
of
SAM lobe
applied
Single coal
SAM
or 2nd
coat of two
coal SAM
Single coal
SAM
Quantity
of binned
Kg/10m2
8 - 10
10- 12
Two coat SAM
1
12 – 14
1st
coat
2nd
8 – 10
coat
Two coat SAM
1st 14- 16
Quantity of chipping
0. 10 m3
of 5.6mm chips
0.11m3
of 5.6mm chips
0.12m1
of 5.6mm and
11.2mm chips in 1:1
rati
0.103
of 5.6mm chips
0.12m3
of 11.2mm chips