PSI - Issue 71

Yash Rathore et al. / Procedia Structural Integrity 71 (2025) 401–408

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5. Conclusions This research explored the impact of adding MK, RHA, and Deccan basalt M-sand on the mechanical properties and acid resistance of concrete. The study's findings reveal several important observations: 1. Incorporating RHA as a partial replacement for OPC significantly enhances the mechanical strength of concrete. This strength improvement is observed up to a 20% RHA content, after which a decline in strength occurs. 2. The addition of MK and Deccan basalt M-sand further boosts the strength of both CC mix and the optimized RHA mix (R20), indicating the synergistic effect of these materials. 3. The inclusion of RHA, MK, and Deccan basalt M-sand effectively reduces compressive strength loss in conventional concrete exposed to sulphuric acid, demonstrating enhanced resistance to acid attack. 4. The incorporation of SCMs like RHA and MK, along with M-sand, significantly reduces the weight loss of concrete specimens, highlighting improved durability under acidic conditions. 5. The R20MK15 mix showed the highest mechanical strength among all tested combinations, while the R20MK10 mix provided the best resistance to acid attack, offering an optimal balance of strength and durability. 6. A higher dosage of superplasticizer is required with the increase in the SCM content in concrete mixes. The addition of M-sand further increases its requirement. These findings suggest that incorporating RHA and MK as SCMs, along with Deccan basalt M-sand, provides a pathway to sustainable concrete production without compromising performance. This approach not only improves the mechanical properties of concrete but also enhances its durability in aggressive environments, making it suitable for various construction applications. References Alex, J., Dhanalakshmi, J., and Ambedkar, B. 2016. Experimental investigation on rice husk ash as cement replacement on concrete production. Construction and Building Materials, 127, 353 – 362. Anh, L. H., Mihai, F.-C., Belousova, A., Kucera, R., Oswald, K.-D., Riedel, W., Sekar, N. A., and Schneider, P. 2023. Life Cycle Assessment of River Sand and Aggregates Alternatives in Concrete. Materials, 16(5), 2064. Antiohos, S. K., Papadakis, V. G., and Tsimas, S. 2014. Rice husk ash (RHA) effectiveness in cement and concrete as a function of reactive silica and fineness. Cement and Concrete Research, 61 – 62, 20 – 27. BIS 383. 2016. Specification for Coarse and Fine Aggregates From Natural Sources for Concrete. In Bureau of Indian Standards,New Delhi (pp. 1 – 24). Bose, M. K. 1972. Deccan basalts. Lithos, 5(2), 131 – 145. https://doi.org/10.1016/0024-4937(72)90065-5 Chopra, D., Siddique, R., and Kunal. 2015. Strength, permeability and microstructure of self-compacting concrete containing rice husk ash. Biosystems Engineering, 130, 72 – 80. Coffetti, D., Crotti, E., Gazzaniga, G., Carrara, M., Pastore, T., and Coppola, L. 2022. Pathways towards sustainable concrete. Cement and Concrete Research, 154, 106718. h Dhinakaran, G., Thilgavathi, S., and Venkataramana, J. 2012. Compressive strength and chloride resistance of metakaolin concrete. KSCE Journal of Civil Engineering, 16(7), 1209 – 1217. Dobiszewska, M., Bagcal, O., Beycioğlu, A., and Goulias, D. 2023. Utilization of rock dust as cement replacement in cement composites: An alternative approach to sustainable mortar and concrete productions. Journal of Building Engineering, 69(February), 106180. Endale, S. A., Taffese, W. Z., Vo, D.-H., and Yehualaw, M. D. 2022. Rice Husk Ash in Concrete. Sustainability, 15(1), 137. Felipe Arbeláez Pérez, O., Senior Arrieta, V., Hernán Gómez Ospina, J., Herrera Herrera, S., Ferney Rodríguez Rojas, C., and María Santis Navarro, A. 2024. Carbon dioxide emissions from traditional and modified concrete. A review. Environmental Development, 101036. Gupta, T., Kothari, S., Siddique, S., Sharma, R. K., and Chaudhary, S. 2019. Influence of stone processing dust on mechanical, durability and sustainability of concrete. Construction and Building Materials, 223, 918 – 927. Homayoonmehr, R., Ramezanianpour, A. A., and Mirdarsoltany, M. 2021. Influence of metakaolin on fresh properties, mechanical properties and corrosion resistance of concrete and its sustainability issues: A review. Journal of Building Engineering, 44, 103011. IS 269. 2015. Ordinary Portland Cement - Specification (Sixth Revision). www.standardsbis.in

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