GBA Chief Commissioner advocates new curing method for white-topping

The Chief Commissioner of the Garage Block Authority (GBA) has thrown weight behind a novel curing technique for white-topping works, a move that could redefine how concrete roads are built and maintained in Bengaluru. The proposal, discussed at a recent review meeting, emphasises the need to shift from conventional curing methods to a more efficient approach that promises better durability and cost savings.

What is white-topping?

White-topping involves laying a layer of Portland cement concrete over an existing asphalt pavement. It is increasingly favoured for high-traffic corridors because it withstands heavy loads and extreme weather better than traditional bitumen surfaces. However, the success of such projects hinges heavily on the curing process—the period during which the concrete is kept moist to achieve optimal strength.

Conventional curing often relies on water spraying or ponding, which can be water-intensive and inconsistent, especially during Bengaluru's dry months. The new technique, though not yet fully detailed by officials, is understood to use a specialised membrane or chemical compound that retains moisture within the concrete slab, reducing water usage and improving uniformity.

Why the push now?

The GBA has several white-topping projects in the pipeline, particularly on arterial roads that handle heavy commuter traffic. Poor curing has been a recurring issue, leading to premature cracking and potholes, which then require frequent repairs. The Chief Commissioner's intervention signals a proactive attempt to institutionalise better engineering practices before these projects are tendered.

According to sources present at the meeting, the commissioner has directed engineers to study the technique's application in other Indian cities, where it has reportedly shown promising results. The directive also includes a review of current project specifications to incorporate the new curing method as a mandatory requirement.

Cost and environmental benefits

While the initial outlay for the advanced curing compound may be slightly higher, officials argue that the long-term gains outweigh the upfront expense. Reduced water consumption is a critical factor in a city that has faced acute water shortages in recent summers. Moreover, better curing translates to fewer repairs, cutting down on traffic disruptions and maintenance budgets.

One engineer familiar with the proposal noted that the technique could extend the lifespan of white-topped roads by several years, potentially saving crores in recurring maintenance. The GBA is expected to release a detailed circular outlining the technical specifications and implementation timeline.

Reactions and road ahead

Contractors have responded cautiously, seeking clarity on the cost implications and the availability of the curing materials locally. The GBA has assured that training sessions will be organised for field staff and contractors to ensure smooth adoption.

As Bengaluru continues to grapple with infrastructure challenges, this initiative could set a precedent for other civic agencies in the state. The success of the technique will depend on strict oversight during execution and the willingness of all stakeholders to embrace change.

In the coming weeks, the GBA is likely to pilot the method on a select stretch before scaling it up across all new white-topping works. The results from this pilot will be closely watched by urban planners and engineers across India.