Abstract
Alkali-contaminated soils have being considered for research in the recent past to counter the industrial failures encountered due to accidental spillages and leakages. It was observed by the researchers that alkali contamination can change the engineering behavior of the soils to a large extent. The change in soil behavior may alter with the concentration of the alkali, type of soil, and duration of alkali interaction. In the present work, the effect of 2 N and 4 N NaOH on the Unconfined compressive strength (UCS) of BC soil and kaolinite clay was studied for 7, 14, and 28 days. From the results, it was evident that the reduction in UCS values were 46 and 43% for BC soil and 44 and 36% for kaolinite clay with a contamination of 2 N and 4 N NaOH, respectively, after a curing period of 28 days. In order to address this reduction in strength, treatment with 10, 15, and 20% of fly ash was opted for both the soils. In the case of BC soil, 15% fly ash was found to be optimum for 2 N contamination while for 4 N contamination, it was linearly increasing up to 20%. For kaolinite clay, 20% of fly ash addition gave an optimum strength for 2 N contamination and for 4 N contamination, it was observed at 15% fly ash content. The increase in strength can be attributed to the initiation of pozzolanic reaction by alkali and subsequent strength improvement with time due to the formation of pozzolanic compounds.
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Ashfaq, M., Heeralal, M., Hari Prasad Reddy, P. (2019). A Study on Strength Behavior of Alkali-Contaminated Soils Treated with Fly Ash. In: Agnihotri, A., Reddy, K., Bansal, A. (eds) Recycled Waste Materials. Lecture Notes in Civil Engineering , vol 32. Springer, Singapore. https://doi.org/10.1007/978-981-13-7017-5_16
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DOI: https://doi.org/10.1007/978-981-13-7017-5_16
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