Research on the resistance of cement-based materials to sulfate attack based on MICP technology

IF 2.6 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Frontiers in Materials Pub Date : 2024-06-06 DOI:10.3389/fmats.2024.1420131

Yong Zhang, Geng Peng, Ai Li, Xinrui Yang, Shuaidi Kong, Yutong An, Junhao Tian, Xupeng Sun

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引用次数: 0

Abstract

To evaluate the effect of Microbial Induced Calcium Carbonate Precipitation (MICP) on the enhancement of early resistance to sulfate attack of cementitious materials. In this paper, firstly, the effect of Bacillus subtilis (BM) on the carbonation depth as well as the carbonation rate of standard as well as carbonation-conditioned cementitious sand specimens was investigated. Secondly, the compressive strength and volumetric deformation of the specimens at different ages of immersion in sulfate solution were investigated. Finally, the changes of hydration products before and after the addition of BM were analyzed by X-ray diffraction analysis (XRD), and the microscopic pore structure of the specimens after erosion was analyzed by low-field nuclear magnetic resonance (LF-NMR) and scanning electron microscope (SEM), which revealed the mechanism of the improvement of BM on the resistance to sulfate erosion of the cementitious materials. The results showed that the initial compressive strength of BM carbonised curing specimens, ordinary carbonised curing specimens and BM standard curing specimens were increased by 42.0%, 34.0% and 4.0%, respectively, compared with the ordinary standard curing specimens, respectively, compared with the control group, and the loss of the final compressive strength was reduced by 37.4%, 25.4%, and 14.5%, and the expansion rate was reduced by 31.3%, 22.0%, after sulfate erosion for 6 months, 5.2%, and porosity decreased by 24.2%, 13.6%, and 9.9%. Microbial mineralization accelerated the reaction between Ca2+ in the pore solution and atmospheric CO2, and the calcite formed filled the pores to make the structure denser, increasing the initial compressive strength of the specimens and reducing the loss of properties when exposed to sulfate solution. Therefore, the application of MICP technology in cementitious materials provides a new direction for the development of durable and sustainable cementitious materials.

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基于 MICP 技术的水泥基材料抗硫酸盐侵蚀性研究

评估微生物诱导碳酸钙沉淀（MICP）对增强水泥基材料早期抗硫酸盐侵蚀能力的影响。本文首先研究了枯草芽孢杆菌（BM）对标准水泥基砂和经碳化处理的水泥基砂试样的碳化深度和碳化速率的影响。其次，研究了试样在硫酸盐溶液中浸泡不同龄期的抗压强度和体积变形。最后，通过 X 射线衍射分析（XRD）分析了 BM 添加前后水化产物的变化，并通过低场核磁共振（LF-NMR）和扫描电子显微镜（SEM）分析了试样侵蚀后的微观孔隙结构，揭示了 BM 对水泥基材料抗硫酸盐侵蚀性的改善机理。结果表明，BM 碳化固化试样、普通碳化固化试样和 BM 标准固化试样的初始抗压强度分别比普通碳化固化试样提高了 42.0%、34.0% 和 4.0%。0%，与普通标准固化试件相比，与对照组相比，最终抗压强度损失分别降低了 37.4%、25.4% 和 14.5%，膨胀率分别降低了 31.3%、22.0%，硫酸盐侵蚀 6 个月后，膨胀率降低了 5.2%，孔隙率分别降低了 24.2%、13.6% 和 9.9%。微生物矿化加速了孔隙溶液中的 Ca2+ 与大气中 CO2 的反应，形成的方解石填充了孔隙，使结构更加致密，提高了试样的初始抗压强度，减少了暴露在硫酸盐溶液中时的性能损失。因此，MICP 技术在胶凝材料中的应用为开发耐久性和可持续发展的胶凝材料提供了新的方向。

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来源期刊

Frontiers in Materials Materials Science-Materials Science (miscellaneous)

CiteScore

4.80

自引率

6.20%

发文量

749

审稿时长

12 weeks

期刊介绍： Frontiers in Materials is a high visibility journal publishing rigorously peer-reviewed research across the entire breadth of materials science and engineering. This interdisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers across academia and industry, and the public worldwide. Founded upon a research community driven approach, this Journal provides a balanced and comprehensive offering of Specialty Sections, each of which has a dedicated Editorial Board of leading experts in the respective field.