Effectiveness of Biological Mortars with Bacterial Glycocalyx on Service Life of Concrete Structures Exposed to Salt Attack

IF 3.6 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY International Journal of Concrete Structures and Materials Pub Date : 2024-03-05 DOI:10.1186/s40069-023-00648-7

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Abstract

This study investigated the effectiveness and limitations of newly developed biological mortars regarding chloride ion diffusion resistance. Through several tests on the glycocalyx production capacity and growth potentials of bacteria cells under marine environments, Bacillus licheniformis was isolated and immobilized in the expanded vermiculites together with a bacterial culture medium for producing biological mortars. The chloride ion diffusion coefficient of the mortars up to 91 days was determined through natural diffusion cell tests. Subsequently, the service life of RC structure repaired with biological mortars under chloride attack was evaluated considering multilayer theory and time-dependent diffusion. The addition of expanded vermiculites immobilizing Bacillus licheniformis significantly reduced the chloride ion diffusion coefficient. When its addition increased from 10 to 30%, the chloride ion diffusion coefficient decreased by 50–90% compared to that of mortars without bacteria. The service life of reinforced concrete structures repaired with biological mortars containing 30% expanded vermiculite concentration and thickness of 50 mm was evaluated to be six times longer than that of repaired with conventional mortar. Overall, this novel approach holds significant potential in addressing the salt-induced deterioration challenges faced by RC structures.

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含细菌糖萼的生物砂浆对受盐害混凝土结构使用寿命的影响

摘要本研究探讨了新开发的生物砂浆在抗氯离子扩散方面的有效性和局限性。通过对海洋环境下细菌细胞的糖萼生成能力和生长潜力进行多次测试，分离出地衣芽孢杆菌，并将其固定在膨胀蛭石中，与细菌培养基一起用于生产生物砂浆。通过自然扩散池试验测定了灰泥在 91 天内的氯离子扩散系数。随后，考虑到多层理论和随时间变化的扩散，对在氯离子侵蚀下使用生物砂浆修复的 RC 结构的使用寿命进行了评估。加入固定地衣芽孢杆菌的膨胀蛭石后，氯离子扩散系数明显降低。当其添加量从 10% 增加到 30% 时，氯离子扩散系数与不含细菌的砂浆相比降低了 50%-90%。经评估，使用蛭石浓度为 30%、厚度为 50 毫米的生物砂浆修复的钢筋混凝土结构的使用寿命比使用传统砂浆修复的结构长六倍。总之，这种新方法在解决钢筋混凝土结构所面临的盐分引起的劣化难题方面具有巨大潜力。

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来源期刊

International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

6.30

自引率

5.90%

发文量

审稿时长

13 weeks

期刊介绍： The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.