whitetopping or concrete overlay for urban roads
TRANSCRIPT
Whitetopping or Concrete overlay
for Urban Roads Design and Construction
Asphalt Roads ???
• Frequent Failures of roads resulting in Potholes and
high recurring maintenance cost
• Asphalt roads results in poor riding quality, slow
movement of traffic, heavy wear & tear of vehicles
and road accidents.
• Increased fuel consumption and pollution
• Need resurfacing very frequently
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Source: TNN 2015
Potholes- India’s Death Trap
What is Whitetopping?
Whitetopping is the covering of an existing asphalt pavement with a
layer of Portland cement concrete. It can be used on road surface
where traditional asphalt pavements have failed due to rutting or
general deterioration. This is as per IRC:SP-76-2015.
Types of Whitetopping
WhiteTopping(Concrete Overlay) is divided into two types based on
thickness of the concrete layer and whether the layer is bonded to the
asphalt substrate or not.
The thickness over 100mm and less than 200mm are called Thin
WhiteTopping (TWT) and
Thickness between 50mm to less than 100mm are called Ultra Thin
WhiteTopping(UTWT).
Benefits of Whitetopping
Good road surface and superior riding experience
Designed Service life of 20-25 years
Low maintenance cost
Cost effective considering life cycle cost
Saving in fuel consumption thus reduction in pollution
Resistance to weather, oil spills etc.
Better reflectivity specially during nights
Reduces heat island effect (during summer)
Use of indigenous materials like cement, aggregates as against imported bitumen –Make in India
Use of ecofriendly products like Fly-ash, GGBS, Silica fume
Concrete after its service life is 100% recyclable
Benefits of Whitetopping
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Lifecycle cost
Fuel saving (CRRI)
Heat Island effect Skid resistance
Construction Stages – Whitetopping Roads
Milling of Asphalt surface
Cleaning & Profile correction
Conduit laying(if required)
Concrete laying by Paving machines
Surface finish by Bull float
Texturing
Curing compound spraying
Groove cutting
Lane Marking
Bangalore-Mysore Infra CorridorRoad-93 lane kms
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Bangalore city roads - 93kms under construction
Recently completed Bangalore city roads
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Thank You !