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Soil stabilization using lignin and bio-enzymes

Mohd Yusoff, Siti Aimi Nadia (2015) Soil stabilization using lignin and bio-enzymes. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Common stabilization techniques for soils to improve strength and durability properties often rely on cement, lime, fly ash, and asphalt emulsion. Stabilization of soil with terrazyme and lignin is a very new method to improve the geotechnical properties of the soil. Terrazyme are liquid additives, which act on the soil to reduce the voids between soil particles and to minimize the absorbance of water to the soil particles to maximize compaction. The effectiveness of terrazyme and lignin depends on the types of soil and the amount of stabilizer used. In this present study, the effectiveness of terrazyme and lignin in stabilizing the different types of soils was investigated through laboratory investigations. Each of the additives tested were designed to mix with the soil to improve the texture, increase strength and reduce swell characteristic. Laterite, kaolin and peat were used as the base soil to investigate the geotechnical properties and treated with variable enzyme dosages. The results presented herein were analyzed in terms of Unconfmed Compressive Strength (UCS) testing. The strength parameter of the stabilized soil has been evaluated after curing periods of 0,7, 15,21 and 30 days. Changes in California Bearing Ratio (CBR) value were monitored after mixing the soil with 2% and 5% additives. The laboratory tests showed, for laterite the higher dosage of both lignin and terrazyme gave higher maximum dry density (MDD) and decreased the optimum moisture content (OMC). Meanwhile for kaolin and peat, both additives did not produced significant effect on both the MDD and the OMC. Then for strength properties, 2% lignin and terrazyrne showed the best improvement in strength tests over a 30-day curing period. The CBR value for stabilized laterite were founded that terrazyme gave a higher CBR value than lignin. Meanwhile for kaolin, 2% terrazyme gave the higher CBR value among other treated kaolin. Lastly for peat, 2% dosage of lignin and terrazyme were found effective, after gave a higher CBR value. But, after comparing stabilized peat and kaolin with the control sample, it can be concluded that lignin and terrazyme is not suitable to use for stabilizing peat and kaolin.

Item Type: Thesis (Masters)
Uncontrolled Keywords: laterite; kaolin; peat; terrazyme; lignin; unconfined compressive test; california bearing ratio
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA703-711 Engineering geology. Rock mechanics. Soil mechanics.
Depositing User: Normajihan Abd. Rahman
Date Deposited: 19 Jan 2016 08:01
Last Modified: 19 Jan 2016 08:01
URI: http://eprints.uthm.edu.my/id/eprint/7479
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