Study on the enhancement and degradation mechanisms of urease mineralization and its application in strengthening water resistance of antique-style clay tiles

CHENG Wen-chieh; HU Wen-le; YUAN Ke; WEN Shao-jie

doi:10.16285/j.rsm.2021.1011

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Study on the enhancement and degradation mechanisms of urease mineralization and its application in strengthening water resistance of antique-style clay tiles

更新时间：2026-06-25

- Study on the enhancement and degradation mechanisms of urease mineralization and its application in strengthening water resistance of antique-style clay tiles
- Vol. 43, Issue S2, Pages: 255-264(2022)
- 作者机构：
  
  1. 西安建筑科技大学土木工程学院,陕西,西安,710055
  2. 西安建筑科技大学陕西省岩土与地下空间工程重点实验室,陕西,西安,710055
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2021.1011
  CLC： TU-87;TU522
- Online First：03 October 2022，
  
  Published：2022
- 稿件说明：
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CHENG Wen-chieh, HU Wen-le, YUAN Ke, et al. Study on the enhancement and degradation mechanisms of urease mineralization and its application in strengthening water resistance of antique-style clay tiles[J]. 2022, 43(S2): 255-264.
DOI：

CHENG Wen-chieh, HU Wen-le, YUAN Ke, et al. Study on the enhancement and degradation mechanisms of urease mineralization and its application in strengthening water resistance of antique-style clay tiles[J]. 2022, 43(S2): 255-264. DOI： 10.16285/j.rsm.2021.1011.

摘要

脲酶诱导碳酸钙沉淀（EICP）是岩土工程古迹和土遗址加固领域具有广阔发展前景的前沿技术。然而，关于脲酶矿化作用机制的研究鲜有报道。以试管试验模拟脲酶矿化过程，研究不同底物浓度、不同镁离子浓度、不同铵根离子浓度对脲酶矿化过程中电导率、酸碱度、碳酸钙沉淀量及沉淀率变化的影响规律，从而揭示脲酶矿化强化及劣化机制，并对个别机制作用下的砖瓦试件进行吸水率、透气率及风蚀试验。结果表明：随着底物浓度的升高，电导率逐渐升高但曲线演变趋势基本不变，pH值变化不显著，沉淀量先升高再降低，沉淀率逐渐降低，其中脲素水解速率和脲酶活性是碳酸根的转化及提高沉淀量和沉淀率的关键；随着氯化镁浓度的升高，沉淀量先增加后降低，沉淀效率逐渐升高，除了生成碳酸钙外，还生成碳酸镁，镁离子在提高脲酶活性从而形成最优矿化效果上具有积极作用；随着氯化铵浓度的增加，电导率逐渐升高，pH值逐渐降低，铵根是导致脲酶活性、沉淀量及沉淀效率劣化的主要原因。吸水率、透气率及抗风蚀性能试验结果突出脲酶诱导碳酸钙沉淀技术用于古迹建筑保护的可行性，为将来实际应用和技术拓展提供数据和理论支持。

Abstract

Enzyme-induced calcite precipitation (EICP) is considered to be the cutting-edge technology with broad development in many fields of geotechnical engineering. However

there are limited studies focused on the mechanism affecting the calcite precipitation. This study conducts a series of test-tube experiments to examine the effects of different substrate concentrations

magnesium ion concentrations

and ammonium ion concentrations on the changes of conductivity

calcium carbonate precipitation and precipitation rate during urease mineralization. In this way

the mechanism of urease mineralization strengthening and deterioration was revealed. The water absorption

air permeability and wind erosion tests were carried out on the brick specimens under the action of individual mechanisms. The results show that with the increase of substrate concentration

the conductivity gradually increases but the evolution trend of the curve remains basically unchanged

the pH value does not change significantly

the precipitation amount first increases and then decreases

and the precipitation rate gradually decreases

among which the urea hydrolysis rate and urease activity is the key to the conversion of carbonate and to increase the amount of precipitation and the rate of precipitation. With the increase of the concentration of magnesium chloride

the amount of precipitation increases first and then decreases

and the precipitation efficiency gradually increases. The ions have a positive effect on enhancing the urease activity to form the optimal mineralization effect. With the increase of the ammonium chloride concentration

the conductivity gradually increases and the pH value gradually decreases. Ammonium radical is the main reason for the deterioration of urease activity

precipitation amount and precipitation efficiency. The water-resisting ability of the produced calcite precipitation is further verified through the water absorption

air permeability

and wind erosion tests respectively. The findings of this study explore the potential use of the EICP technology for the protection of heritage buildings in north-west China

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