Abstract
This work evaluates the strength of a tropical residual lateritic soil treated with Sporosarcina pasteurii (a microorganism cultured from the soil) in stepped densities of suspension of 0/ml, 1.50 × 108/ml, 6.0 × 108/ml, 1.20 × 109/ml, 1.80 × 109/ml and 2.40 × 109/ml, respectively and cured for 12 h in polythene bags at 24 ± 2 °C. Specimens were prepared at moulding water contents between –2% and +4% relative to optimum moisture content (OMC) and compacted with British Standard light (BSL) energy (or standard Proctor). The compacted soil specimens were then permeated under gravity with a cementation reagent consisting of 20 g of Urea, 10 g of NH4Cl, 3 g of Nutrient broth, 2.8 g of CaCl2 and 2.12 g of NaHCO3 per litre of de ionized water to initiate microbial-induced calcite precipitation (MICP). Permeation was carried out in three cycles with 2/3 pore volume each, specimens were extruded 24 h after the last permeation and cured for another 48 h before subjection to unconfined compressive strength (UCS) test. Results obtained showed a general decrease in UCS values with higher moulding water content regardless of the density of S.pasteurii suspension. Peak UCS values were recorded for specimens prepared at –2% relative to OMC for all densities of S.pasteurii suspension. S.pasteurii suspension density of 1.20 × 109/ml, can be considered the optimal treatment of the lateritic soil, which recorded a peak UCS value of 2232 kN/m2 that underscores its efficacy in strength improvement.
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Osinubi, K.J., Gadzama, E.W., Eberemu, A.O., Ijimdiya, T.S., Yakubu, S.E. (2019). Evaluation of the Strength of Compacted Lateritic Soil Treated with Sporosarcina Pasteurii. In: Zhan, L., Chen, Y., Bouazza, A. (eds) Proceedings of the 8th International Congress on Environmental Geotechnics Volume 3. ICEG 2018. Environmental Science and Engineering(). Springer, Singapore. https://doi.org/10.1007/978-981-13-2227-3_52
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