particular specifications (road works) - CIDCO Maharashtra Ltd.

CIDCO OF MAHARASHTRA LTD
C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 294
Grading 1 2
Nominal aggregate size 40 mm 25 mm
Layer thickness 80 – 100 mm 50 – 75 mm
IS Sieve 1 (mm) Cumulative % by weight of total aggregate passing
0.6 - -
0.3 7 – 21 7 – 21
0.15 - -
0.075 2 – 8 2 – 8
Bitumen content % by
mass of total mix 2
Min 4.0 Min 4.5
Bitumen grade (pen) 60/70 60/70
Note : 1) The combined aggregate grading shall not vary from the low
limit on one sieve to the high limit on the adjacent sieve.
2) Determined by the Marshall method.
10.3 MIXTURE DESIGN:
10.3.1 Requirement for the mixture:
Apart from conformity with the grading and quality requirements for
individual ingredients, the mixture shall meet the requirements set out
in Table 500-11.
TABLE 500-11
REQUIREMENTS FOR DENSE GRADED BITUMINOUS MACADAM
Minimum stability (kN at 600C) 9.0
Minimum flow (mm) 2
Maximum flow (mm) 4
Compaction level (Number of blows) 75 blows on each of the two
faces of the specimen
Percent air voids 3-6
Percent voids in mineral aggregate
(VMA)
See Table 500-12 below
Percent voids filled with bitumen (VFB) 65-75