Self-healing by biocomposite containing metakaolin immobilized bacterial spores in concrete using low-cost corn steep liquor media

IF 4.7 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Sustainable Cement-Based Materials Pub Date : 2023-06-22 DOI:10.1080/21650373.2023.2224805

Navneet Sidhu, S. Goyal, M. Reddy

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引用次数: 4

Abstract

The present study aimed to develop a biocomposite constituting metakaolin as a suitable carrier material for immobilizing bacterial spores. The biocomposite was stored at 4 °C and 25 °C and showed a sustainable shelf-life of bacterial spores during the storage period of 180 days. Biocomposite was assessed for urease activity and calcium carbonate precipitation in corn steep liquor (CSL) as the growth medium. Significant improvements in strength and permeation were observed at 7 and 28 days of testing in concrete added with biocomposite. The study was extended to test the self-healing capabilities of biocomposite in prismatic specimens using CSL medium. Crack healing showed significant improvement in ultrasonic pulse velocity, indicating progressive healing of the crack, and the repaired surface was examined by water tightness. The precipitated minerals were assessed by scanning electron microscopy and X-ray diffraction. The CSL can be used as low-cost growth media, eventually decreasing the cost of self-healing concrete.

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含偏高岭土固定化细菌孢子的生物复合材料在混凝土中的自愈作用

本研究旨在开发一种由偏高岭土组成的生物复合材料，作为固定细菌孢子的合适载体材料。生物复合材料在4 °C和25 °C，并在180的储存期内显示出细菌孢子的可持续保质期天。以玉米浸液（CSL）为生长培养基，对生物复合材料的脲酶活性和碳酸钙沉淀进行了评价。在7和28处观察到强度和渗透性的显著改善在添加了生物复合材料的混凝土中测试的天数。该研究扩展到使用CSL介质测试生物复合材料在棱柱试样中的自修复能力。裂纹愈合显示超声脉冲速度显著提高，表明裂纹逐渐愈合，并通过水密性检查修复表面。通过扫描电子显微镜和X射线衍射对沉淀的矿物进行了评估。CSL可以用作低成本的生长介质，最终降低自修复混凝土的成本。

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来源期刊

Journal of Sustainable Cement-Based Materials Multiple-

CiteScore

6.60

自引率

15.90%

发文量

期刊介绍： The Journal of Sustainable Cement-Based Materials aims to publish theoretical and applied researches on materials, products and structures that incorporate cement. The journal is a forum for discussion of research on manufacture, hydration and performance of cement-based materials; novel experimental techniques; the latest analytical and modelling methods; the examination and the diagnosis of real cement and concrete structures; and the potential for improved cement-based materials. The journal welcomes original research papers, major reviews, rapid communications and selected conference papers. The Journal of Sustainable Cement-Based Materials covers a wide range of topics within its subject category, including but are not limited to: • raw materials and manufacture of cement • mixing, rheology and hydration • admixtures • structural characteristics and performance of cement-based materials • characterisation techniques and modeling • use of fibre in cement based-materials • degradation and repair of cement-based materials • novel testing techniques and applications • waste management