Characteristic Analysis on Materials for Recycled Composite Pavement

Abstract

The rural and semi urban collector and local streets of India is usually unpaved or paved using the materials such as clay compacted, gravel compacted or water bound macadam surfacing. These materials undergo damages very soon under heavy loadings, extreme weather conditions etc. So it is proposed to adopt composite pavement for paving the local and collector streets of rural areas. A composite structure is defined as multi-layer structure where there is a flexible layer over a rigid layer. In a composite pavement, a cement treated base is provided under the wearing course. Due to its unique structural behavior, it got a longer life and provides rider comfort, comparatively greater than any conventional pavement. But constructing a composite pavement with conventional material is quite expensive. Due to the abundance availability of construction waste and demolition debris, it is proposed to use it, in place of conventional materials. The broken brick bats are tested for its suitability to be used as a granular sub-base material. For recycled lean concrete to be used as cement treated base course, the crushed concrete is tested for its replacement for conventional coarse aggregate. The materials of Brick bats for granular sub-base and recycled lean concrete for base course, confines the properties of requirements for pavement materials as specified by Rural road quality control handbook of Ministry of Rural development, Government of India and IRC 63, Use of low grade aggregates and soil-aggregate mixtures in road pavements. The structural design of composite pavement is done accordance to "pavement design manual" published by "Illinois Department of Transportation".