Performance evaluation of bio-based mortar incorporating fly ash, rice husk ash, and granite slurry for concrete repair
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Author |
Thota Mohit Venkata Devi Rajesh, P. K. Prasanna, Pratheba S., Lingeshwaran N., George Fernandez Raj A. and P. Jayanthi
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e-ISSN |
1819-6608 |
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On Pages
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1387-1406
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Volume No. |
20
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Issue No. |
17
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Issue Date |
December 15, 2025
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DOI |
https://doi.org/10.59018/0925159
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Keywords |
fly ash, rice husk ash, granite slurry, sustainable mortar, concrete repair, durability, pozzolanic activity.
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Abstract
This research presents a detailed evaluation of bio-based mortar developed for sustainable concrete repair using industrial and agricultural by-products. The study explores the synergistic effects of fly ash (FA), rice husk ash (RHA), and granite slurry (GS) as partial replacements for ordinary Portland cement and natural fine aggregate. A total of 54 mortar mixes were formulated based on an M30-grade design, incorporating FA, RHA, and GS at 10%, 20%, and 30% by weight. Mechanical performance was assessed through compressive strength, split tensile strength, flexural strength, and bond strength, while water absorption was used as an indicator of durability. Results revealed that the ternary mix with 20% FA, 20% RHA, and 20% GS demonstrated superior performance with a 26% increase in compressive strength, 24% enhancement in bond strength, and 27% reduction in water absorption at 56 days, compared to the control mix. The improvements are attributed to the pozzolanic reactivity of FA and RHA, which enhanced calcium silicate hydrate (C-S-H) formation, and the micro-filler effect of GS that refined the pore structure. These findings validate the technical feasibility and environmental potential of FA-RHA-GS blended mortars for application in high-performance, durable, and eco-efficient concrete repair systems.
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