abstract: This study evaluates the use of plant-extracted silica solution as a bio-based grout material for improvement of granular soils. Although silicate grout is a very well-established and popular technique in the ground improvement market, efforts have been initiated to replace chemically-synthesized silicate grout with plant-extracted silica grout. This initiative will increase the level of sustainability and consequently improve the existing market acceptability. The silica-rich plant source used for extraction was rice husk, which is an abundantly produced agricultural waste. The extraction method includes acid-leaching, temperature-controlled rice husk ash production and the preparation of an aqueous sodium silicate solution from the ash through an alkaline leachate method. Silica ash was in amorphous form containing 95% of silica content which is suitable for soil treatment. Gelation time was controlled in the absence and presence of sand under different pH values. Bio-based silica grouting showed an improvement of the shear strength of the soil as well as the hydraulic conductivity reduction. / Dissertation/Thesis / Masters Thesis Civil, Environmental and Sustainable Engineering 2019
| Identifer | oai:union.ndltd.org:asu.edu/item:55670 |
| Date | January 2019 |
| Contributors | Sayed Mostafa, Ahmad (Author), Zapata, Claudia (Advisor), Khodadaditirkolaei, Hamed (Advisor), Kavazanjian, Edward (Committee member), Arizona State University (Publisher) |
| Source Sets | Arizona State University |
| Language | English |
| Detected Language | English |
| Type | Masters Thesis |
| Format | 111 pages |
| Rights | http://rightsstatements.org/vocab/InC/1.0/ |
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