Experimental study on the calcium carbonate production rates and crystal size of EICP under multi-factor coupling

Zhang, Jianwei; Yin, Yue; Shi, Wanpeng; Song, Danqing; Lu, Yu; Shi, Lei; Zhiguang, Han

doi:10.1016/j.cscm.2022.e01802

Cited by 7 publications

(2 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the aeolian sand and the cementing material were mixed well before the reaction, there is no risk of the injection or grout channels being blocked, and a higher concentration of cementing solution could be used to ensure the continuous production of calcium carbonate. The literature found the inhibitory effect of a high calcium ion concentration will be weakened in the highly active urease solution, and the production rates of calcium carbonate can be maintained at a high level [44]. Of course, a commercial urease with high urease activity was used in this experiment, which was extracted from giant beans and exhibited a specific activity of 200 U/mg at room temperature.…”

Section: Influence Of Alternating Temperature On the Calcium Carbonat...mentioning

confidence: 99%

Influence of Alternating Temperature on the Effectiveness of EICP in Consolidating Aeolian Sand

Zhang

Lin

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

The utilization of enzyme-induced calcium carbonate precipitation (EICP) to consolidate aeolian sand has received significant attention in recent years. However, urease activity is directly affected by temperature, which varies greatly from day to night, especially in desert areas. To investigate the effect of alternating temperature on aeolian sand cementation by EICP, three experimental groups were designed to simulate the sunrise-to-sunset cycle in a natural desert environment: T1 (a process from heating to constant temperature to cooling), T2 (a process from cooling to constant temperature to heating), and T3 (a process of constant temperature throughout) as a control group. The differences in calcium carbonate content, precipitation rate of calcium carbonate, permeability coefficients, and shear wave velocity were compared and analyzed. Meanwhile, scanning electron microscopy (SEM) was conducted to observe the external cementation states by mineralization. The results showed that T2 had the highest calcium carbonate content, followed by T3 and, finally, T1, which were also confirmed by permeability coefficient and shear wave velocity tests. In addition, different alternating temperature processes would affect the survival time of the urease, and T2 showed the longest reaction time as the urease stayed active for the longest time in this process. The results provide a scientific reference for the selection of construction periods in which EICP can be optimally applied for the on-site aeolian sand cementation.

show abstract

Section: Influence Of Alternating Temperature On the Calcium Carbonat...mentioning

confidence: 99%

Influence of Alternating Temperature on the Effectiveness of EICP in Consolidating Aeolian Sand

Zhang

Lin

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…The production and distribution of calcium carbonate have a great in uence on the reinforcement effectiveness of MICP [51,56]. Thus, how to make calcium carbonate form a large amount of uniform cementation in soil and developing the practical supporting reinforcement process has attracted the attention of academic communities [52,57]. Various approaches have been utilized to simplify the application process and enhance the practical effectiveness of MICP.…”

Section: Introductionmentioning

confidence: 99%

A One-Phase Injection Method to Improve the Strength and Uniformity in MICP with Polycarboxylic Acid Added

Zhu,

Li,

Sun

et al. 2024

Preprint

View full text Add to dashboard Cite

The production and distribution uniformity of calcium carbonate plays a pivotal role in enhancing the effectiveness of microbially induced calcium carbonate precipitation (MICP). Various methods have been proposed to enhance the conversion rate of calcium ions and ensure uniform calcium carbonate distribution. These include multi-phase injection methods and one-phase injection methods with environmental factors such as pH and temperature controlled. Polycarboxylic acid, a polymer organic substance rich in carboxylic acid groups, serves as a regulator for the initial precipitation time of calcium carbonate. It aids in increasing the total output of calcium carbonate by complexing calcium ions. This study introduces and investigates a one-phase injection method of MICP with the addition of polycarboxylic acid. The methodology is examined through bacteria growth tests, tube tests, sand column tests, and microscopic analyses. The results indicate that polycarboxylic acid does not exhibit any side effects on Sporosarcina pasteurii (S. pasteurii). When the urease activity of the bacterial solution is maintained at 15 kU/L and the concentration of the cement solution is 1 mol/L, incorporating a 3% solution of polycarboxylic acid delays the initial precipitation time of calcium carbonate by more than two hours. This delay significantly contributes to improving the uniformity of calcium carbonate distribution, with complete precipitation of calcium ions occurring within 24 hours. After five treatment cycles, the unconfined compressive strength of the sand column reaches 2.76 MPa. This method demonstrates promising potential for application in enhancing reinforcement effects and streamlining the reinforcement process.

show abstract

Efficiency and Morphology of Calcium Carbonate Precipitate Induced by Urease Enzymes

Aishwarya,

Juneja

2023

Geotech Geol Eng

View full text Add to dashboard Cite

Experimental study on the calcium carbonate production rates and crystal size of EICP under multi-factor coupling

Cited by 7 publications

References 36 publications

Influence of Alternating Temperature on the Effectiveness of EICP in Consolidating Aeolian Sand

Influence of Alternating Temperature on the Effectiveness of EICP in Consolidating Aeolian Sand

A One-Phase Injection Method to Improve the Strength and Uniformity in MICP with Polycarboxylic Acid Added

Efficiency and Morphology of Calcium Carbonate Precipitate Induced by Urease Enzymes

Contact Info

Product

Resources

About