One-phase-low-pH enzyme induced carbonate precipitation (EICP) method for soil improvement

Cui, Ming-Juan; Lai, Han-Jiang; Hoang, Tung; Chu, Jian

doi:10.1007/s11440-020-01043-2

Cited by 146 publications

(35 citation statements)

References 46 publications

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“…3.1 Effect of soil properties I) Soil Type: To date, MICP treatment has been widely applied for different types of soils, including clay [52,53,[148][149][150], silt [150,151], residual soil [42,129,[152][153][154][155], coal ash [156,157], expansive soil [158], tabia [159], mixture of sand and clay [63,121,[160][161][162] or silt [163][164][165], sandy soil [166,167], fine sand [85,168], coarse sand [85,[168][169][170][171][172][173], calcareous sand [56,118,137,[174][175][176][177][178], gravel [150,179,180] and aggregate [116,[1...…”

Section: Strength Enhancement Of Soilmentioning

confidence: 99%

“…For fine to medium coarse sand, the particle size may significantly affect the strength enhancement with the MICP treatment. Amarakoon and Kawasaki [33,189], Hoang et al [168], Zhao et al [190], Lin et al [191], and Terzis and Laloui [192,193] reported that the strength enhancement of the bio-cemented soil was higher for relatively coarser soil under the same treatment conditions. Similarly, Jiang et al [63] reported that biocementation of sand-clay mixture using coarse host sand was better than that with fine host sand.…”

Section: Strength Enhancement Of Soilmentioning

confidence: 99%

“…Keykha et al [239], Li et al [240], Seifan et al [241] reported that the treatment solution (containing bacteria, urea, and CaCl 2 ) with a higher pH (up to 12) is favored to yield more calcium carbonate. a) Grouting mode: There are mainly three grouting modes: 1) Intermittent mode [85,242,243], 2) Continuous mode [242,243], and 3) Recycle mode [126,163,168]. The intermittent mode is conducted by injecting the treatment solution into the sample and then curing it for a period of time until the next treatment, the continuous mode is to inject the treatment solution into the sample continuously during the whole treatment duration, and the recycle mode is to inject a certain volume of treatment solution into the sample circularly.…”

Section: Cementation Solution Parametersmentioning

confidence: 99%

“…As an alternative, using the urease for the urea hydrolysis to precipitate the calcium carbonate, so-called Enzyme Induced Calcite Precipitation (EICP) [309][310][311][312], could reduce or even avoid the issue of bio-safety. The urease can be extracted from UPB [163,168] or some plant seeds, such as soybean [313], jack bean [314,315], and watermelon seeds [309,316]. Moreover, the production of any potential hazardous and harmful byproduct during the treatment process must be properly collected and treated.…”

Section: Challenges and Strategies For Biogeotechnologymentioning

confidence: 99%

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Recent development in biogeotechnology and its engineering applications

Cui

Chu

2021

Front. Struct. Civ. Eng.

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Microbial geotechnology or biogeotechnology is a new branch of geotechnical engineering. It involves the use of microbiology for traditional geotechnical applications. Many new innovative soil improvement methods have been developed in recent years based on this approach. A proper understanding of the various approaches and the performances of different methods can help researchers and engineers to develop the most appropriate geotechnical solutions. At present, most of the methods can be categorized into three major types, biocementation, bioclogging, and biogas desaturation. Similarities and differences of different approaches and their potential applications are reviewed. Factors affecting the different processes are also discussed. Examples of up-scaled model tests and pilot trials are presented to show the emerging applications. The challenges and problems of biogeotechnology are also discussed.

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Section: Strength Enhancement Of Soilmentioning

confidence: 99%

Section: Strength Enhancement Of Soilmentioning

confidence: 99%

Section: Cementation Solution Parametersmentioning

confidence: 99%

Section: Challenges and Strategies For Biogeotechnologymentioning

confidence: 99%

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Recent development in biogeotechnology and its engineering applications

Cui

Chu

2021

Front. Struct. Civ. Eng.

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“…Both technologies are widely used in soil reinforcement [ 4 , 5 , 6 ]. Previous scholars [ 7 , 8 ] have successfully used PVA fiber to improve cement-based composites. In order to compensate for the undesirable weakness of the brittle failure and low residual strength of biocemented soil, researchers have attempted to combine MICP technology with fiber reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

et al. 2021

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Enzyme-induced calcium carbonate precipitation (EICP) technology can improve the strength of treated soil. But it also leads to remarkable brittleness of the soil. This study used polyvinyl alcohol (PVA) fiber combined with EICP to solidify sand. Through the unconfined compressive strength (UCS) test, the effect of PVA fiber incorporation on the mechanical properties of EICP-solidified sand was investigated; the distribution of CaCO3 in the sample and the microstructure of fiber-reinforced EICP-treated sand were explored through the calcium carbonate content (CCC) test and microscopic experiment. Compared with the sand treated by EICP, the strength and stiffness of the sand reinforced by the fiber combined with EICP were greatly improved, and the ductility was also improved to a certain extent. However, the increase of CCC was extremely weak, and the inhomogeneity of CaCO3 distribution was enlarged; the influence of fiber length on the UCS and CCC of the treated sand was greater than that of the fiber content. The improvement of EICP-solidified sand by PVA fiber was mainly due to the formation of a “fiber–CaCO3–sand” spatial structure system through fiber bridging, not the increase of CCC.

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