Soil stabilization using lignin and bio-enzymes
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,...
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| Format: | Thesis |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7479/ http://eprints.uthm.edu.my/7479/1/siti_aimi_nadia_mohd_yusoff.pdf |
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| Summary: | 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. |
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