— Cost of 1-tone river sand was 2700 and SCD was 1500. If SCD replaces up to 80% river sand in manufacturing of 1 m 3 concrete mix of paver block, SCD will able to save 1123 kg river sand i.e. 44% reduction in cost of manufacturing of 1 m 3 concrete mix. [16] also mentioned that utilization of SCD may reduce 56% cost of 1 m 3 of concrete. This ...