soil stabilization with calcium lignosulfonate considering different mixing methods

Message:
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:

One of the best methods for improvement of clayey soils is stabilization. Traditional stabilizer such as lime, and cement have been used extensively for improving engineering properties of poor soils by earlier researcher. But using these additives involved with environmentof problems. However, lignin is a kind of natural polymer that is derived as a by-product from paper and timber processing industry, and according to government figures, annual amount of 50 million tons of lignin is discarded. This brown powder is not toxic or corrosive and does not endanger the health of humans and the environment. In this study, the effect of adding different percentages of lignin on atterberg limits, compaction properties and unconfined strength of clay is studied. Also, the effect of adding lignin with different mixing methods on resistance and soil morphology is investigated. The results of this investigation shows that the addition of lignin, generally improves the mechanical properties of soil, decreases the soil's plastic index, and enhances the strength and ductility of the soil. For soil used in this study, the optimum percentage of calcium lignosulfonate is determined as 1% of dry weight, which allowes to increase soil strength from 322 to 828 kPa after 28 days. Also, the mixing method has a significant effect on the resistance of the samples. In soil stabilization, the proper distribution of the additive among soil particles can affect the soil engineering properties. For example, mixed specimens in different ways, their maximum strength increased by up to 80%.

Language:
Persian
Published:
Amirkabir Journal of Civil Engineering, Volume:53 Issue: 2, 2021
Pages:
783 to 798
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