Abstract
This paper provides an insight into a new biotechnological method based on calcite precipitation for achieving high strength bio-concrete durability. It is very clear that mineral precipitation has the potential to enhance construction material resistance towards degradation procedures. The appropriate microbial cell concentration (30 ∗ 105 cells/ml) was introduced onto different structural concrete grades (40, 45 and 50 MPa) by mixing water. In order to study the durability of structural concrete against aggressive agents, specimens were immersed in different types of acids solution (5% H2SO4 and HCl) to compare their effects on 60th, 90th and 120th day. In general, sulphuric acid and hydrochloric acid are known to be the most aggressive natural threats from industrial waters which can penetrate concrete to transfer the soluble calcium salts away from the cement matrix. The experimental results demonstrated that bio-concrete has less weight and strength losses when compared to the ordinary Portland cement concrete without microorganism. It was also found that maximum compressive strength and weight loss occurred during H2SO4 acid immersion as compared to HCl immersion. The density and uniformity of bio-concrete were examined using ultrasonic pulse velocity (UPV) test. Microstructure chemical analysis was also quantified by energy dispersive spectrometer (EDS) to justify the durability improvement in bacterial concrete. It was observed that less sulphur and chloride were noticed in bacterial concrete against H2SO4 and HCl, respectively in comparison to the ordinary Portland cement concrete due to calcite deposition.
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The authors thank the Ministry of Science, Technology and Innovation of Malaysia (MOSTI) — science fund - Vote. no 4S042) and the Construction Research Alliance of UTM (Universiti Teknologi Malaysia (Vote. no 00522) for financial support.
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ANDALIB, R., ABD MAJID, M.Z., KEYVANFAR, A. et al. Durability improvement assessment in different high strength bacterial structural concrete grades against different types of acids. Sadhana 39, 1509–1522 (2014). https://doi.org/10.1007/s12046-014-0283-0
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DOI: https://doi.org/10.1007/s12046-014-0283-0