Investigation of the Flexural Behavior of Bacterial Concrete Beams

IF 1.1 Q3 ENGINEERING, CIVIL

Civil and Environmental Engineering Pub Date : 2023-12-01 DOI:10.2478/cee-2023-0043

Mohammed T. Hind, Ahmed S. Ali

{"title":"Investigation of the Flexural Behavior of Bacterial Concrete Beams","authors":"Mohammed T. Hind, Ahmed S. Ali","doi":"10.2478/cee-2023-0043","DOIUrl":null,"url":null,"abstract":"Abstract Bacterial self-healing concrete is an eco-friendly and superior treatment technique that has efficient bonding capacity and compatibility with concrete compositions. It is capable of filling deep microcracks and healing the crack autonomously by calcium carbonate precipitating phenomenon which results in sustainable construction materials. The purpose of this research is to investigate the use of microorganisms Bacillus Subtilis to improve the mechanical properties and the efficiency of self-healing of reinforced concrete beams for two types of concrete, reactive powder concrete (RPC), and lightweight self-compacting concrete (LWASCC), by two methods of addition (direct addition, and encapsulation). The experimental program consists of casting six simply supported beams tested under monotonic and repeated loading. Incorporate bacteria and the precursor (calcium lactate) in concrete mixtures show an improvement in compressive strength, splitting, and flexural strength by up to 21.74 %, 10.92 %, 21.21 % by encapsulation method, and 17.7 %, 18.0 %, 20.84 % by direct addition. In addition, there is an enhancement in the first crack load and ultimate load. Microscopical image demonstrated that calcium carbonates had been deposited in the crack up to 1.0 mm width by bacterial activity within 32 days.","PeriodicalId":42034,"journal":{"name":"Civil and Environmental Engineering","volume":"964 ","pages":"474 - 492"},"PeriodicalIF":1.1000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Civil and Environmental Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2478/cee-2023-0043","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}

引用次数: 0

Abstract

Abstract Bacterial self-healing concrete is an eco-friendly and superior treatment technique that has efficient bonding capacity and compatibility with concrete compositions. It is capable of filling deep microcracks and healing the crack autonomously by calcium carbonate precipitating phenomenon which results in sustainable construction materials. The purpose of this research is to investigate the use of microorganisms Bacillus Subtilis to improve the mechanical properties and the efficiency of self-healing of reinforced concrete beams for two types of concrete, reactive powder concrete (RPC), and lightweight self-compacting concrete (LWASCC), by two methods of addition (direct addition, and encapsulation). The experimental program consists of casting six simply supported beams tested under monotonic and repeated loading. Incorporate bacteria and the precursor (calcium lactate) in concrete mixtures show an improvement in compressive strength, splitting, and flexural strength by up to 21.74 %, 10.92 %, 21.21 % by encapsulation method, and 17.7 %, 18.0 %, 20.84 % by direct addition. In addition, there is an enhancement in the first crack load and ultimate load. Microscopical image demonstrated that calcium carbonates had been deposited in the crack up to 1.0 mm width by bacterial activity within 32 days.

查看原文本刊更多论文

细菌混凝土梁的抗弯行为研究

摘要细菌自愈合混凝土是一种生态友好型高级处理技术，具有高效的粘结能力和与混凝土成分的兼容性。它能够填充深层微裂缝，并通过碳酸钙析出现象自主愈合裂缝，从而形成可持续的建筑材料。本研究的目的是通过两种添加方法（直接添加和封装），研究利用微生物枯草芽孢杆菌改善两种混凝土（活性粉末混凝土（RPC）和轻质自密实混凝土（LWASCC））的机械性能和钢筋混凝土梁的自愈合效率。实验项目包括浇注六根简单支撑的梁，并在单调和重复加载条件下进行测试。在混凝土混合物中加入细菌和前体（乳酸钙）后，抗压强度、劈裂强度和抗折强度分别提高了 21.74 %、10.92 % 和 21.21 %（封装法），而直接添加法分别提高了 17.7 %、18.0 % 和 20.84 %。此外，首次开裂荷载和极限荷载也有所提高。显微图像显示，在 32 天内，碳酸钙通过细菌活动沉积在宽度达 1.0 毫米的裂缝中。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Civil and Environmental Engineering ENGINEERING, CIVIL-

CiteScore

2.00

自引率

58.30%

发文量