Investigation of superplasticizer influence on rheological and strength properties of self-compacting geopolymer concrete
DOI:
https://doi.org/10.62638/ZasMat1258Keywords:
Self-consolidating geopolymer concrete, Coal fly ash, Superplasticizers, Master Gelnium SKY 8233, superplasticizerAbstract
Self-compacting concrete plays a crucial role in the concrete industry due to the increasing demand for rapid infrastructure development to accommodate the growing population. However, traditional concrete requires a large amount of cement, leading to significant CO₂ emissions during production. To address this issue, an innovative self-compacting geopolymer concrete (SCGC) has been developed, eliminating the need for cement while maintaining key self-compacting properties such as flowability, passing ability, and filling ability, along with desirable hardened characteristics.The self-compacting behavior of SCGC is influenced by the dosage of superplasticizers (SP), which significantly improves its workability. Four SCGC mixes were prepared with varying SP dosages at 2% intervals (ranging from 0% to 6%), using 450 kg/m³ of fly ash and a Na₂SiO₃ to NaOH ratio of 1:2.5. The alkali solution-to-binder ratio was maintained at 0.45, with additional water at 54 kg/m³. The effect of SP dosage on workability and mechanical strength was analyzed in the SCGC mixes. The results indicate that an SP dosage of 2% was optimal at a NaOH molarity of 12, yielding the best rheological and strength properties. Based on these findings, it is recommended that the SP dosage in SCGC be optimized at 2%.
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