| Issue |
E3S Web Conf.
Volume 434, 2023
4th International Conference on Energetics, Civil and Agricultural Engineering (ICECAE 2023)
|
|
|---|---|---|
| Article Number | 02006 | |
| Number of page(s) | 10 | |
| Section | Civil Engineering | |
| DOI | https://doi.org/10.1051/e3sconf/202343402006 | |
| Published online | 12 October 2023 | |
Implementation of eggshell extracted calcium acetate in biocementation via soybean urease
Department of Building Engineering and Construction Management, Khulna University of Engineering and Technology, Khulna - 9203, Bangladesh
* Corresponding author: azhoque97@gmail.com
Biocementaion, a promising soil improvement technique, mostly utilizes calcium chloride (CaCl2) as its calcium source. However, using CaCl2 poses a critical environmental problem of producing ammonium chloride as a by-product. Alternatively, when calcium acetate (Ca(CH3COO)2) is used as the calcium source, the production of ammonium chloride during biocementation can be reduced. Ca(CH3COO)2 can be easily derived from waste eggshells. Nevertheless, such research has been conducted only with Microbial Induced Carbonate Precipitation (MICP) to date. This paper aims to study the implementation of eggshell Ca(CH3COO)2 in the more effective biocementation approach: Enzyme Induced Carbonate Precipitation (EICP) via soybean urease. For this study, EICP solutions of varying molar ratios and concentrations were studied for their precipitation efficiency and reinforcement effect on poorly graded sandy soil. The findings showed that the EICP solution composition of 1:1 molar ratio between Ca(CH3COO)2 and urea, added with 50 g/L soybean solution reached the maximum precipitation efficiency. It also produced the highest 7-day UCS of 371 kPa at a calcium carbonate content of 0.40%. Furthermore, the eggshell-soybean EICP produced 8.5% higher UCS than CaCl2-soybean EICP despite having similar calcium carbonate content.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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