Abstract
Increase in production capacity of opencast coal mines is realised through deployment of increasingly larger capacity haul trucks, which require appropriately designed and well maintained haul roads. Use of fly ash-overburden mix can enhance mechanical property of sub-base and at the same time enhance waste utilisation. This paper reports the detailed laboratory investigations carried out on development of fly ash composite materials with mine overburden, clinker and evaluation of their suitability for haul road. Proctor compaction tests, unconfined compressive strength (UCS) tests, california bearing ratio (CBR) tests were carried out at different curing periods. The composite with 62% fly ash, 30% overburden and 8% clinker exhibited adequate strength value for the haul road application.
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