- A polymer-modified asphalt emulsion-based, densegraded, cold mixed, quick-setting and bituminous resurfacing material.
- It is a protective seal coat which extends the life of pavement. A thin, tough layer of polymer modified bitumen emulsion blended with dense graded crushed mineral aggregates, mineral fillers, water and chemical additives for traction.
- This is a cost-effective method to renew the road surface and seal minor cracks and other irregularities.
- BitChem Microsurfacing Emulsion is manufactured strictly as per IS 8887-2017/ ISSA.
Table 1 - Gradation of aggregate for Microsurfacing (As per IRC: SP: 100-2014):
|
Sieve size (mm) |
Percentage by mass passing (minimum layer thickness) |
|
|
Type II |
Type III |
|
|
9.5 |
- |
100 |
|
6.3 |
100 |
91-100 |
|
4.75 |
90-100 |
70-90 |
|
2.36 |
65-90 |
45-70 |
|
1.18 |
45-70 |
28-50 |
|
0.600 |
30-50 |
19-34 |
|
0.300 |
18-30 |
12-25 |
|
0.150 |
10-21 |
7-18 |
|
0.075 |
5-15 |
5-15 |
Table 2 - Mix Design criteria for Microsurfacing mix:
|
Requirements |
Specification |
|
Mix time, Min |
120 sec |
|
Consistency, Max |
3 cm |
|
Wet Cohesion, within 30 min, Min |
12 kg.cm |
|
Wet Cohesion, within 60 min, Min |
20 kg.cm |
|
Wet Stripping value,%, Min |
90% retain coating |
|
Wet Track abrasion Loss (one hour soak), Max |
538 g/m2 |
Table 3 - Indicative limits of ingredients in mix:
|
Ingredients |
Limits (% by weight of aggregate) |
|
Residual Bitumen |
6.5 to 10.5 for Type II, 5.5 to 10.5 for Type III |
|
Mineral filler |
0.5 to 3.0 |
|
Additive |
As needed |
|
Water |
As needed |
Table 4 - Requirement of Microsurfacing mix for different types:
|
Items |
Type II (4-6mm) |
Type III(6-8mm) |
|
Application |
For roads in urban and rural |
For primary and inter-state routes, |
|
Quantity of Microsurfacing mix |
8.4-10.8 |
11.1-16.3 |
|
Residual binder (% by weight of dry |
6.5-10.5 |
5.5-10.5 |
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