Abstract
The research presented is part of a larger project focusing on finding the optimum mix design for cement pastes using ternary blended binder containing cement, Calcium metasilicate (CMS), and colloidal nano-SiO2. Water absorption and sorptivity tests were also conducted to ascertain the porosity of the paste mixes. Compressive and flexural strength were used for the mechanical properties of different mixes, and rheology was conducted to find the flow characteristics of paste mixes. The numerical modeling employed involves regression analysis and curve fitting to find the significant factors affecting the properties of cement composites. The experimental data were subjected to analysis of variance (ANOVA) to determine the essential factors and their interactions. The results for strength parameters for high-volume replacement suggests that the optimum replacement levels for nano-SiO2 were 3% in both w/b ratios. The rheological parameter states that microfibres of CMS and nano-SiO2, increased the viscosity and decreasing the yield stress. The FESEM micrographs show the sequestration of CO2 and calcite formation due to high-volume CMS.
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