Mix proportion design and carbon emission assessment of high strength geopolymer concrete based on ternary solid waste

To accelerate the promotion and application of geopolymers in concrete (GPC), this study proposed a high strength geopolymer concrete (HSGPC) with ternary solid waste. The mix proportion of HSGPC was optimized and the impact of HSGPC on the environment was evaluated. Results indicate that the optimal mix proportion for HSGPC was 15% FA content, 10.30% SF content, a Na2SiO3/NaOH ratio of 2.5, and an NaOH molar concentration of 10 M. The molar concentration of sodium hydroxide has the greatest influence on the compressive strength of HSGPC, and the ratio of sodium silicate to sodium hydroxide solution has the greatest influence on the splitting tensile strength of HSGPC. Compared to ordinary Portland cement concrete, the carbon emissions of HSGPC have been reduced by approximately 30%. The production of HSGPC reduces the carbon emissions by 59.87% and 68.24% compared with ultra-high-performance concrete and reactive powder concrete of equivalent strength respectively.