Optimizing Mortar Mixtures with Basalt Rubble: Impacts on Compressive Strength and Chloride Penetration

This research aims to establish a theoretical framework for developing binders from waste materials to reduce cement use in mortar production. It specifically examines the potential of ground basalt rubble (BS) as a supplementary binding material for partially replacing Portland cement Type ۱ (OPC) in mortar mixtures. Various substitution ratios of BS, specifically ۰%, ۱۰%, ۲۰%, ۳۰%, and ۴۰% by binder weight, were tested while maintaining a constant water-to-binder ratio (W/B) of ۰.۴۵. Superplasticizers (SP) were utilized to ensure consistent workability and flow of the mixtures. The SEM-EDS analysis was conducted to examine the microstructure of the cement paste, confirming the presence of calcium silicate hydrate (C-S-H) phases resulting from the pozzolanic reactions of BS. The findings showed that, at the ۷-day test, replacing cement with ۱۰% and ۲۰% basalt rubble (BS) by weight of the binder yielded compressive strengths of ۹۷% and ۹۲% compared to the control (CT) mortar. In contrast, replacements of ۳۰% and ۴۰% BS resulted in compressive strengths of ۷۲% and ۶۰% of the CT mortar, respectively. Results from ۲۸-day tests showed that replacing ۱۰% of OPC with BS not only increased the compressive strength but also significantly decreased chloride penetration compared to the control mortar (CT). This enhancement suggests that BS can effectively replace ۱۰%-۲۰% of cement, with the compressive strength of the mortar ranging from ۹۲% to ۱۰۷% of that of the control. The findings accentuate the potential of using industrial by-products such as ground basalt rubble to reduce waste, alleviate environmental impacts, and promote the development of sustainable construction materials. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۴-۰۱۰-۱۲-۰۱۳ Full Text: PDF

کلیدواژه ها:

Basalt Rubble ، Construction Materials ، Chloride Penetration ، Strength.