SELF-HEALING OF MORTAR CRACKS: THE ROLE OF HUMAN PATHOLOGICAL BACTERIA

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2022-04-02 DOI:10.32852/iqjfmme.v22i1.583

Lina A. Naser Al-Timimi, Mohanad N. Al-Shroofy, Aynoor A. Jan, Aseel B. Al-Zubaidi

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Abstract

The characteristics of self-healing related to N-type cement mortars, the addition of human pathological bacteria to enhance mortar durability, and compressive strength thus reducing maintenance cost and manpower after crack initiation. Bacteria have been examined by using two types of biological agents: Proteus mirabilis and E. Coli bacteria. Mortars are formed from a combination of Portland cement and ordinary sand, treated by Proteus mirabilis and E. Coli bacteria with different concentrations. The mechanical properties of the treated mortars are measured and the mortars were characterized by means of Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and electron energy dispersive spectroscopy (EDX). This study shows that Proteus mirabilis and E. Coli assist the formation of calcium carbonate inside the mortar micro-pores leading to enhancement of the compressive strength and hardness of the mortar specimen. This emphasizes the possibility of activating the self-healing characteristic of the cement mortar and its utilization for cracks treatment and repair

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砂浆裂缝的自愈合：人体病理细菌的作用

自修复特性与N型水泥砂浆有关，添加了人体病理菌以提高砂浆的耐久性和抗压强度，从而降低了裂缝萌生后的维护成本和人力。已经使用两种类型的生物制剂对细菌进行了检测：奇异变形杆菌和大肠杆菌。砂浆由硅酸盐水泥和普通沙子混合而成，经过不同浓度的奇异变形杆菌和大肠杆菌处理。通过傅立叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和电子能谱（EDX）对处理后的砂浆的力学性能进行了测量和表征。本研究表明，奇异变形杆菌和大肠杆菌有助于砂浆微孔内碳酸钙的形成，从而提高砂浆试样的抗压强度和硬度。这强调了激活水泥砂浆自修复特性的可能性及其在裂缝处理和修复中的应用

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来源期刊

Iraqi Journal for Mechanical and Materials Engineering

自引率

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审稿时长

24 weeks