Methodology for Proportioning SCC Containing High Powder Content Derived from Crushed Stone Sand

Abstract

This chapter demonstrates a simple methodology with a worked-out example for proportioning Self-Compacting Concrete (SCC) which makes use of the powder content present in the crushed stone sand. This proposed method comprises of three stages, which are designing the paste composition, calculating the paste and aggregate volume, and proportioning fine and coarse aggregate. Seven SCC mixes (SCC-A to SCC-G) were designed in this proposed method with varying cement and Ultra-Fine Ground Granulated Blast Furnace Slag (UFGGBFS) content to evaluate their fresh as well as hardened properties. The total powder content of the SCC mixes was 587 ± 1 kg/m3, the 450 kg/m3 of powder content was contributed by binder and remaining 137 ± 1 kg/m3 was contributed by the powder (particles lesser than 0.125 mm) present in the crushed stone sand. It was inferred that, all the seven SCC mixes possessed high flowability, excellent passing ability and enough segregation resistance. The SCC-B mix with 11% of UFGGBFS achieved a maximal compressive strength of 54 MPa with a split tensile strength of 5.1 MPa at 28 days of curing. On the other hand, SCC-G mix achieved a noticeable compressive strength of 31.3 MPa with a minimum cement content of 150 kg/m3. The mixes designed in this proposed method adhere well with the EFNARC guidelines for proportioning the Self-Compacting Concrete (SCC).