Optimised Proportion of Recycled Concrete Aggregates (RCA) and Blast Furnace Slag as Granular Subbase (GSB) Material in Pavement

Abstract

Due to rapid industrialization, the waste product are also being generated in huge quantity which occupies large quantity of precious land as well as creating environmental problems. Recycled Concrete Aggregates (RCA) which is generated as a part of Construction and Demolition material. Similarly, Blast furnace slag is the waste product of steel industry. As the construction of pavements require a huge amount of aggregates, the replacement of part of fresh aggregates with mixture of Recycled Concrete Aggregates (RCA) Blast furnace slag and will be very beneficial considering the scarcity of fresh aggregates. Therfore, an attempt is made in the present study to determine the optimum proportion of Recycled Concrete Aggregates (RCA) and Blast furnace slag as Base material in pavement.

Based on experimental results, it is observed that 60% of recycled concrete aggregtes (RCA) and 40% of Blast furnace slag gives a CBR value of 42% and 38% in unsoaked and soaked condition respectively. Hence, the above mentioned proportion of material may be used as a granular subbase (GSB) material in the pavement construction.