PSI - Issue 70

Vijaya Sundravel K et al. / Procedia Structural Integrity 70 (2025) 485–492

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and bacterial concrete beams (SHM-CC and SHM-BC-02, respectively) tested 28 days after formwork removal. As shown in Figure 2, the SHM-CC beams outperformed conventional concrete beams, achieving an maximum load of 68 kN with a deflection of 10.6 mm, compared to 58 kN and 9.8 mm for the standard beams. Similarly, Figure 3 demonstrates that the SHM-BC-02 beams, which incorporated 0.2% Bacillus Subtilis, exhibited improved load bearing capacity and lower deflection rates compared to conventional concrete. These findings further validate the benefits of bacterial concrete since the microbial-induced calcite precipitation (MICP) strengthens the tensile strength of the concrete and self-healing properties.

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Fig.2. Load vs Deflection curve for SHM-CC vs SHM-BC-02 beam

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Fig.3. Load vs Deflection curve for CC vs SHM-BC-02 beam

3.4. Analysis of Beam Deformation and Failure Modes The deformation characteristics and faiure mechanisms of concrete beams under loading conditions were thoroughly examined for both conventional and bacterial concrete mixes Vijaya Sundravel et al. (2025). Through this analysis, the insights gained on how each form of concrete behaves when subjected to stress and ultimately fails were revealed, thereby indicating the variance in performance and durability between the two materials.