Investigation of cold-in-place recycled mixes in India

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Abstract
Cold-in-place recycling (CIR) is a popular and cost-effective bituminous pavement rehabilitation technique. India has very limited experience with this technique. A few stretches of national highways were rehabilitated in the recent past using CIR technique. In the present investigation, laboratory experiments were conducted on different cold-recycled mixes prepared using the bituminous material milled from in-service bituminous pavement. The effect of compaction effort, curing time, aggregate gradation and choice of additive on the performance of the cold mixes was investigated. Structural evaluation of a cold-in-place recycled layer was carried out using falling weight deflectometer. Laboratory investigation yielded guidelines on appropriate accelerated curing conditions, compaction effort and optimum fluid content to be adopted for the preparing cold-recycled mixes using the milled bituminous material obtained from typical Indian highways. Structural evaluation of the recycled layer suggested significant increase in the elastic modulus of recycled layer.

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