Achievement of Roller Compacted Concrete Incorporating GGBS by Using Soil Compaction Approach

Roller compacted concrete (RCC) gained momentum as a paving material because of economy, strength and fast placement. The basic constituents of RCC are similar to the conventional concrete. However, it requires a larger proportion of sand, lesser water and cement content in comparison with the conventional concrete. The mix design of the RCC is based on either consolidation (concrete) technique or compaction (soil, geotechnical) technique. In this paper, the mix design steps of RCC for pavement (RCCP) by using the soil approach are presented. Further, the effect of using ground granulated blast furnace slag (GGBS) and type of aggregates on the resultant properties of RCC were investigated. Different RCC mixtures were prepared with two types of aggregates and by replacing cement with GGBS. The optimum water content of each mix was finalized after conducting a compaction test for each replacement level. Experimental results show that the soil compaction approach leads to minimum voids in the finalized mix with maximum density. Limestone aggregate and cement replacement with GGBS increased the water requirement of the RCC mix. The experimental results show that GGBS inclusion had a marginal effect on 28 days compressive strength in the case of limestone aggregate, while for crushed gravel aggregate large decrease in strength was observed at 60% replacement level. In terms of 28 days of flexural strength behaviour, the better performance was shown by the 40% GGBS inclusion with limestone aggregate.