Microsurfacing is 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 8887-2018/ 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:
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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:
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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
areas, residential streets, as
preventive and renewal
treatment (< 15** CVPD)
|
For primary and inter-state routes,
highways and runways to give maximum
skid resistance, preventive and renewal
treatment (> 1500 CVPD)
|
|
Quantity of Microsurfacing mix
(Kg/m2)
|
8.4-10.8
|
11.1-16.3
|
|
Residual binder (% by weight of dry
aggregate)
|
6.5-10.5
|
5.5-10.5
|
Microsurfacing
Microsurfacing consists of mixture of modified (Polymer or Rubber Latex) bitumen emulsion, well graded mineral aggregate, water, filler and additive (if needed) proportioned, mixed and uniformly spread over a properly prepared surface. It is applied on an existing pavement surface which is structurally sound but is showing the signs of functional distress such as loss riding quality, cracking and polishing. Generally, microsurfacing is laid in single layer, but when the existing surface is highly polished or cracked, it is advisable to apply it in two or more layers. Microsurfacing can be used for surface treatment on roads, taxi ways and runways.
BitChem Microsurfacing is a quick setting system which is able to receive traffic after a short period of time preferably within about one to two hours of its laying depending upon weather conditions.
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