Application of improved enzyme induced calcium carbonate precipitation (EICP) technology in surface protection of earthen sites

Dong, Jin; Liu, Xiaobin

doi:10.1016/j.culher.2022.01.016

Cited by 14 publications

(2 citation statements)

References 15 publications

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“…Lee et al [ 24 ] studied the properties of the EICP-treated sand specimens using the grouting method and concluded that the EICP-treated sand specimens showed greater softening behavior in the unconfined state. Dong et al [ 25 ] used sucrose and skim milk powder to improve EICP technology to protect the surface of the ancient buildings of Tabia. The results show that sucrose-modified EICP technology can be used as an effective method through which to protect the Tabia site and even ancient buildings.…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Properties of Crack Mortar Repaired by Enzyme-Induced Calcium Carbonate Precipitation (EICP)

Li,

Yan,

Liu

et al. 2024

Materials

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As an emerging repair method, the enzyme-induced calcium carbonate precipitation (EICP) technique has the advantages of being highly economical, eco-friendly, and durable. The optimal repair conditions were obtained by taking cement mortar as the research object, adding two types of filling medium, using three EICP-based repair methods to repair the cement mortar with different crack widths, and combining ultrasonic testing and strength testing to evaluate the mechanical properties and repair effects of the repair mortar. The microscopic structure of the mortar was established using mesoscopic and microscopic tests (XRD, SEM, and EDS), thereby revealing the mechanism of repair based on EICP. The test results show that, when quartz sand is used as the repair medium, more calcium carbonate adheres to the cross-section of test samples, and it has a better repair effect. Moreover, the repair effect of the injection method is significantly higher than those of the perfusion and immersion methods, and the ultrasonic wave transit time decreases by 1.22% on average. Based on the combination of quartz sand and EICP repair methods, the calcium carbonate precipitated among the sand granules contributes to a binding effect that strengthens the cohesive force among the sand granules.

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Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Properties of Crack Mortar Repaired by Enzyme-Induced Calcium Carbonate Precipitation (EICP)

Li,

Yan,

Liu

et al. 2024

Materials

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“…The performance improvement effect of soil samples after EICP treatment is mainly measured using mechanical tests such as the unconfined test [ 40 ], the triaxial test [ 41 , 42 ] and the direct shear test [ 43 ]. The current EICP technology has been applied in engineering applications including windbreak and sand fixation [ 44 , 45 ], seepage prevention and leakage stoppage [ 46 , 47 , 48 ], foundation improvement [ 49 , 50 , 51 , 52 , 53 , 54 , 55 ], soil slope reinforcement [ 56 , 57 ], crack repair [ 58 , 59 ] and cultural relic restoration [ 60 ], and other fields have achieved good results and have better prospects. However, the direct use of urease to catalyze the hydrolysis of urea and then the formation of calcium carbonate lack nucleation sites that are conducive to crystal formation; in order to make up for this defect in EICP technology, this paper introduces lignin, a natural, efficient and environmentally friendly soil conditioner, to act as a nucleation site to improve soil.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Different Improvement Schemes of EICP-Lignin Solidified Silt

Sun

Zhong

et al. 2023

Materials

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In practical engineering applications, silt is prone to liquefaction and quicksand. This paper mainly studies the improvement effects of urease, lignin and their mixture on the strength and liquefaction resistance of silt. Based on the results and phenomena of an unconfined compressive strength and dynamic triaxial test, the improvement effects of the compressive strength, deformation resistance and liquefaction resistance of silt under different improvement schemes are analyzed, and the optimal values of the cement or lignin when enzyme-induced calcium carbonate precipitation (EICP) technology, lignin alone or EICP and lignin are obtained. The results show that the optimum concentration of the constant temperature and humidity sample (referred to as the constant humidity sample) and the constant temperature immersion sample (referred to as the soaking sample) of urease in the unconfined compressive strength test is 1.0 mol/L, and the compressive strength of the soaking sample is 4.9 MPa, which is 1.56 times that of the constant humidity sample; the optimum addition ratio of the lignin-improved constant humidity sample is 3%, and its compressive strength is 2.07 Mpa; the optimum addition ratio of the samples immersed at constant temperature is 4%, and the compressive strength is 3.05 MPa; when urease combines with lignin to improve silt, 4% is the best lignin addition ratio, the compressive strength of the constant humidity sample reaches 1.57 Mpa and the compressive strength of the soaking sample reaches 3.75 MPa; in the dynamic triaxial multi-stage cyclic load test, all samples were cured at constant humidity sample, and in the urease modified silt scheme, 1.0 mol/L was the optimal cement concentration; in the scheme of improving silt with lignin, 3% is the optimal addition ratio; when 1.25 mol/L cementation solution plus urease crude extract is combined with different ratios of lignin in the experimental scheme, 3% is the best lignin addition ratio.

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Uniaxial Compression Behavior and Energy Evolution of Joint Rock Repaired and Reinforced with Biocementation Method

Wang,

Shen,

Cao

et al. 2024

Rock Mech Rock Eng

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Application of improved enzyme induced calcium carbonate precipitation (EICP) technology in surface protection of earthen sites

Cited by 14 publications

References 15 publications

Study on the Mechanical Properties of Crack Mortar Repaired by Enzyme-Induced Calcium Carbonate Precipitation (EICP)

Study on the Mechanical Properties of Crack Mortar Repaired by Enzyme-Induced Calcium Carbonate Precipitation (EICP)

Experimental Study on Different Improvement Schemes of EICP-Lignin Solidified Silt

Uniaxial Compression Behavior and Energy Evolution of Joint Rock Repaired and Reinforced with Biocementation Method

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