Thin White Topping on Cement Treated Base for Rural Roads

Abstract

Most of the Indian villages have been connected with granular sub base(GSB), water bound macadam (WBM) or bituminous roads. Rural roads usually have low volume of traffic, consisting mostly of light transport vehicles with less frequency of heavy traffic.  Maintenance of these roads is neglected because of paucity of funds and the road asset created is in deteriorated condition.  The non-availability of suitable soil and aggregates have made projects unviable and cost prohibitive. This aggregate scarcity will increase further as part of environmental conservation and restriction on mining. The stabilization of soil/aggregate is being used for optimal usage of scares resources.  Cold in place recycling technique provides a comprehensive solution for rehabilitation of existing road and green field road construction.  In order to construct durable roads Thin White Topping is laid on cement treated base.  Cement treated base can be achieved with Cold In Place Recycling process, which allow usage of locally available marginal materials.

Two rural roads are identified in Pune district. Pavements are designed considering Thin White Topping on cement treated base. These roads are constructed using cold in place recycling technique. The existing base course is stabilised with cement.  Thin White Topping is provided as wearing course. The performance of pavement is evaluated after construction. The paper describes construction aspect, analysis and design, difficulties encountered and remedial measures suggested. The life cycle cost analysis of pavement is made.  The stabilised pavements with Thin White Topping offer superior strength and longevity, economic solution and provide better performance.