Article
Construction & Building Technology
Jirapa Intarasoontron, Wiboonluk Pungrasmi, Peem Nuaklong, Pitcha Jongvivatsakul, Suched Likitlersuang
Summary: The study compared the crack healing performances of self-healing concretes using cell/nutrient dropping and immobilization methods. Results showed that the cell dropping method was more effective in closing cracks and recovering ultimate load after repair, while specimens mixed with microencapsulated bacterial spores exhibited lower ultimate loads than control specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Ruikai Han, Shunshun Xu, Jiaguang Zhang, Yuanzhen Liu, Aijuan Zhou
Summary: This study aimed to demonstrate the feasibility of using microbial consortia-enhanced recycled concrete aggregates (RCAs) to immobilize bacteria and form self-healing cracks. Experimental results showed that the physical and mechanical properties of RCAs could be significantly enhanced with the extension of biodeposition enhancement time, and concrete incorporated with enhanced RCAs or ceramsite particle-immobilized mixed cultures exhibited self-healing cracks.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Jun Feng, Bingcheng Chen, Weiwei Sun, Yang Wang
Summary: This study developed novel bacteria-based self-healing concrete through microbial induced calcium carbonate precipitation mechanism. Bacillus subtilis M9 was used for biomineralization test, resulting in calcium carbonate precipitation. After 28 days of curing, micro cracks were autonomously healed due to bacterial metabolic activity.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Environmental Sciences
Mohammad Mirshahmohammad, Hamid Rahmani, Mahdi Maleki-Kakelar, Abbas Bahari
Summary: Different biological methods were studied to repair concrete cracks, and it was found that adding bacterial nutrients to the concrete significantly improved its mechanical properties and self-healing characteristics, reducing the healing time.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Construction & Building Technology
Tangwei Mi, Ligang Peng, Keqiong Yu, Yuxi Zhao
Summary: This study aims to optimize the treatment of recycled aggregate concrete (RAC) using microbial-induced carbonate precipitation (MICP) and enzyme-induced carbonate precipitation (EICP) methods. The study determined the optimal Ca concentration in the culture medium for MICP and EICP, as well as the optimal precipitation regimes for both treatments. The performance of RAC was significantly improved after both treatments, with EICP demonstrating superior performance.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Ismael Justo-Reinoso, Bianca J. J. Reeksting, Charlotte Hamley-Bennett, Andrew Heath, Susanne Gebhard, Kevin Paine
Summary: The cost of encapsulating bacterial spores is a barrier to the commercialization of self-healing cementitious materials. This study evaluated the feasibility of using air-entraining admixtures (AEAs) as a cost-effective method for encapsulating bacterial spores to repair cracks. The results showed that using AEAs improved the healing performance and water penetration resistance compared to other methods, such as aerated concrete granules (ACGs).
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Qionglin Fu, Mingwang Liu, Shaoxuan Zhang, Liulei Lu, Naizhuang Fang, Jianbao Chen, Shibu Shama, Junfeng Wang
Summary: This study investigates the growth and mineralization characteristics of Bacillus subtilis (BS) isolated from seawater in shrimp farms and uses it to repair coastal concrete cracks. The results show that the mineralization ability of the BS is higher than that of the common Bacillus pasteurii (BP). The self-healing rate of the BS is 2 times that of the BP mortar and 7 times that of ordinary mortar.
MATERIALS TODAY COMMUNICATIONS
(2023)
Review
Environmental Sciences
Kuan Zhang, Chao-Sheng Tang, Ning-Jun Jiang, Xiao-Hua Pan, Bo Liu, Yi-Jie Wang, Bin Shi
Summary: Microbial-induced carbonate precipitation (MICP) is a emerging biomineralization technology mediated by specific bacteria that has gained significant attention from scientists and engineers over the past two decades. It offers advanced solutions for various engineering problems caused by intense human activities. This paper provides a review of the fundamentals and engineering applications of MICP technology, highlighting its relevance in geotechnical engineering, construction materials, hydraulic engineering, geological engineering, and environmental engineering.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Construction & Building Technology
Manas Sarkar, Moumita Maiti, Shilang Xu, Saroj Mandal
Summary: This study investigates the self-healing concepts in cement-based materials by using alkaliphilic spore-forming Bacillus cohnii microbes in bio-concrete. The regaining of structural efficiency is evaluated based on mechanical strength and durability properties. Bio-mineralized calcium carbonate seals a significant number of pores, resulting in a reduction of voids and an improvement in compressive strength. Microbes only degrade nutrients to produce healing agents without affecting the concrete structure. The sealing of cracks with microbes intensifies mechanical strength and validates self-healing.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Bowen Guan, Qian Tian, Jun Li, Haile Zheng, Ting Xue
Summary: This study focuses on the temperature sensitivity and oxygen dependence of microbial self-healing techniques of concrete. The results show that the cold-resistant bacteria, Brevibacterium frigoritolerans A779, has the capability to grow and induce calcite precipitation at low temperature, making it a potential candidate for the in-depth self-healing of concrete at broad temperature range.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Sarah Pitell, Evan Trump, Bashear El-Hajj, Steven Sachs, Sarah-Jane Haig
Summary: In this study, native microorganisms capable of calcium carbonate precipitation were isolated from existing reinforced concrete structures using traditional microbiological techniques. These microorganisms were then used in bench-scale model structures to create a bioactive mortar for crack repair. Experimental results indicated that one of the isolated microorganisms outperformed traditional organisms in reducing water ingress in cracks.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Amany M. Reyad, Gehad Mokhtar
Summary: Novel carrier units were evaluated for their bio-healing benefits in concrete repair. Bacillus cereus MG708176, an alkali-tolerant, calcite precipitating, endospore-forming strain, was immobilized on wood ash units and added as a bio-healing agent. The results showed significant improvements in the mechanical properties of concrete by filling the cracks with a calcite-producing bacterium immobilized on wood ash units.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Chemical
Guoqing Shi, Jiamin Qi, Yanming Wang, Sun Liu
Summary: The study explored the use of a biological dust suppressant prepared with Bacillus pasteurii, CaCl2, and urea for the prevention of mine dust, showing effectiveness in wetting coal dust. The highest yield of mineralized products and strongest urease activity were observed at a CaCl2-urea solution concentration of 0.6 mol/L. When the volume ratio of bacterial solution to CaCl2-urea solution was 1:1 and the CaCl2-urea solution was 0.6 mol/L, the best dust suppression effect was achieved, indicating that MICP is a mine dust control technology with strong development prospects.
Article
Environmental Sciences
Xiang -Ming Hu, Jin-Di Liu, Yue Feng, Yan-Yun Zhao, Xu-Wei Wang, Wen-Hao Liu, Ming Zhang, Yu Liu
Summary: This paper proposes a new method of enriching urease-producing microbial communities in seawater in a non-sterile environment to solve the dust problem caused by sandstorms. The dust suppression performance of the enriched microorganisms under different pH conditions was explored. The results showed that the alkaline environment promoted the transformation of CaCO3 to more stable calcite, and the mineralization rate reached its maximum value at pH = 10 on the 7th day.
ENVIRONMENTAL RESEARCH
(2023)
Article
Construction & Building Technology
Lu Jiang, Pengjun Li, Wenjing Wang, Yu Zhang, Zhu Li
Summary: This article provides a comprehensive overview of the current research status of microbial-induced carbonate precipitation (MICP) technology in self-healing concrete cracks. It covers the selection of repair systems, evaluation methods for the self-healing ability of concrete, and practical applications. The paper also highlights the challenges facing this technology and outlines promising directions for future advancement.
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
(2023)