Performance of Thin White Topping (TWT) Overlay for NH-848

Vikas V. Thakar, MD, Pavetech Consultants India, presents the uses and advantages of TWT as a cost-effective treatment and a sustainable solution for rehabilitating and strengthening of flexible pavements, as seen in the NH-848 Nashik Peth Section in Maharashtra State.

Introduction

IRC SP76-2015 defines Thin White Topping (TWT) as concrete overlay with thickness between 100 to 200 mm. The Thin White Topping treatment for the current project site of NH 848 is carried out on existing bituminous pavement with concrete overlay thickness of 200 mm after milling of existing bituminous surface for creation of bond. Proper Pre overlay treatment is carried out for the isolated failed patches before undertaking the concrete overlay work. The project was titled as “Concrete overlay for Nashik to state border of Thane-Nashik-Peth-Kaparda-Pardi Road NH 848 - commencing from km 16/000 to km 34/000, km 39/000 to 57/000, & km 62/000 to 65/600 in the State of Maharashtra”.

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