Effects of Bacillus pumilus precipitation on the flexural strength of jute fibre reinforced concrete
Uwemedimo Nyong Wilson, Abraham Salami, Mohammed Abdulkareem Adisa
TL;DR
This study shows how using Bacillus pumilus to create calcium carbonate in concrete with jute fibers can improve strength and durability.
Contribution
The study demonstrates a novel synergy between jute fibers and microbial-induced calcite precipitation for enhancing concrete performance.
Findings
High bacterial dosage (B24) significantly enhanced 28-day flexural strength despite reduced workability.
Bacterial treatments improved resistance to acid attack and reduced mass and dimensional loss.
SEM observations confirmed increased CaCO₃ deposition and better fiber-matrix bonding with higher bacterial concentrations.
Abstract
This study investigates the influence of Bacillus pumilus–induced calcium carbonate precipitation (MICP) on the flexural performance and durability of jute fibre–reinforced concrete (JFRC). A nominal 1:2:4 concrete mix with 1% jute fibre (treated and untreated) was prepared and dosed with three bacterial concentrations (B1.5, B12, and B24). Prismatic beams (150 × 150 × 500 mm) were cured and tested at 7, 14, 21, and 28 days under three-point bending, and a total of twelve beams per mix (n = 12), corresponding to three replicate specimens at each curing age, were evaluated. Fresh properties (slump and compaction factor), mass and dimensional loss, SEM microstructural observations, and statistical analysis (two-way ANOVA and Tukey HSD) were used to interpret results. Findings show that bacterial dosage strongly governs performance: low dosage (B1.5) produced minor early-age gains;…
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Taxonomy
TopicsMicrobial Applications in Construction Materials · Natural Fiber Reinforced Composites · Innovative concrete reinforcement materials