Abstract
Lime treated lateritic soils are among the commonly applied construction materials in tropical and subtropical regions where they are widely distributed, due to the humid climate. However, the long-term performance of this material has been greatly influenced by the changes in the geoenvironment, for instance, under the action of contaminants lime-treated laterite may not perform as well as it would have in their absence. To characterize the changes in the geoenvironment, determining the degree of its acidity or alkalinity i.e. pH has been adopted by most scholars, and it has been shown that pH has a profound effect on the solubility of contaminants. In order to observe these issues experimental setups where established to monitor the effect of aggregate size, and addition of Meta-Kaolin (MK) on pH, Electrical conductivity (EC) and calcium ion (Ca2+) concentration of lime treated laterite. The results show that MK lowers the pH slightly in the short term and tends to maintain a very narrow range in the long term. Moreover, this property significantly influences the erosional and permeability properties. It was also observed that for the same percentage of lime a sample with 5 mm maximum aggregate had a pH slightly higher than the one with 0.5 mm maximum aggregate size sample. Further, a decrease in the amount of Ca2+ concentration, inevitably translates into a decrease in pH values and EC for a lime-laterite mixture.
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Limunga, G.M., Tan, Yz. (2019). The Effects of Meta-Kaolin on pH, Electric Conductivity (EC) and Ca2+ Ions Consumption of Lime-Treated Laterite. 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_25
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DOI: https://doi.org/10.1007/978-981-13-2227-3_25
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