Whitetopping or Concrete overlay for Urban Roads

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 !