jismart2023044: Early Strength Performance of Hybrid Alkaline Activated Mortar

Abstract

This study focuses on the development of sustainable cement-based materials by formulating Hybrid Alkali Activated Mortar (HAAM) using Ordinary Portland Cement (OPC), Ground Granulated Blast Furnace Slag (GGBS), Coal Bottom Ash (CBA) precursors and Lime Kiln Dust (LKD) as an alkali activator. Concrete production is reliant mainly on OPC, significantly contributing to global carbon emissions. By incorporating industrial by-products like GGBS and CBA and utilising LKD as an alkali activator, this research aims to reduce the carbon footprint associated with concrete production. HAAM mixes were prepared considering varying proportions of OPC, GGBS, CBA and LKD. Workability assessments demonstrated the superior performance of resulatant HAAM compared to conventional mixes. Flexural and compressive strength analyses at seven days revealed that HAAM formulations with increased OPC content exhibited enhanced mechanical properties. In conclusion, the HAAM mix, O20G70C30 with 5% LKD, exhibited the overall best performance making it a promising sustainable alternative in the construction industry.