Recycling of Combined Rice Husk Ash as Cement Replacemet and Foundry Sand Waste as Fine Aggregate Replacement in Self-Compacting Concrete

Abstract

For advanced applications in construction of modern concretes, high-performance self-consolidating concrete (SCC) has high performance properties, particularly when in its fluid state. It passes congested reinforcing steels without either excessive bleeding or segregation. SCC can therefore improve long-term and early-age durability and mechanical characteristics. The concentration of this research is the combined impacts of utilizing foundry sand waste (FDW) acquired from the processes of casting automobile engines as a fine aggregate replacement in the quantities of 30 and 50 wt%, and untreated rice husk ash (RHA) acquired from rice-husk-based electricity energy plants to substitute for Type-I Portland cement in the quantities of 10 and 20 wt%. The measured slump flow should range from 65.0 ± 2.5 cm for the SCC prepared with ordinary Portland cement and RHA (water-binder substances), and the SCC production targeted slump flow. A detailed research is carried out in this investigations that includes test to establish the durability, hardened, and fresh characteristics of SCC specimens. The findings and results show that compared to those of control SCC, FDW utilized to substitute ordinary Portland to the specified level had positive impacts on the self-consolidating concretes with RHA, improves the setting times and needed quantities of superplasticizers and reduces the SCC slump flow. While decreasing the durability, the FDW and RHA incorporations reduce segregations, filling, and passing abilities of SCC. In conclusion, the RHA-FDW-SCC generated met the durability requirements of SCC, and indicated the greater splitting and compressive tensile strength of all the samples tested in comparison with the traditional SCC.