Experiments and predictions of physical properties of sand cemented by enzymatically-induced carbonate precipitation
By H. Yasuhara, D. Neupane, Kazuyuki Hayashi, M. Okamura. 2012
341 citations recorded by the source corpus.
Abstract A grouting technique that utilizes precipitated calcium carbonate as a cementing material is presented. The enzyme urease is used to enhance the rate and the magnitude of the calcium carbonate precipitation. Evolutions in the mechanical and the hydraulic properties of treated sand samples are examined through unconfined compression and permeability tests, respectively. The grout is mainly composed of urease, which bio-catalyzes the hydrolysis of urea into carbon dioxide and ammonia, urea, and calcium chloride solutions. This method employs chemical reactions catalyzed by the enzyme, and ultimately acquires precipitated calcium carbonate within soils. The mechanical test results show that even a small percentage of calcium carbonate, precipitated within soils of interest, brings about a drastic improvement in the strength of the soils compared to that of untreated soils—the unconfined compressive strength of the samples treated with
Subfields: Civil and Structural Engineering, Environmental Engineering
View Paper: https://www.semanticscholar.org/paper/66a246835232c372dec041df84ea7dd5f1d936a4
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In Civil and Structural Engineering
Citations in the corpus
- Biological process of soil improvement in civil engineering: A review (2016, background): “Yasuhara et al. (2012) reported potentials of using urease enzyme from other sources different from bacteria to catalyze the hydrolysis of urea in the presence of calcium chloride to precipitate calcium carbonate for the improvement of engineering properties of sand samples.”