Self-immune of Efflorescence on Cementitious Materials Induced by Bacteria: Experiment and simulation

Author(s): Chunxiang Qian, Bin Xue and Tianji Cao
Paper category: Proceedings
Book title: 3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): Changwen Miao, Wei Sun, Jiaping Liu, Huisu Chen, Guang Ye and Klaas van Breugel
Print-ISBN: 978-2-35158-188-9
e-ISBN: 978-2-35158-189-6
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 467-476
Total Pages : 10
Language : English

Abstract: It is presented that a new technique of microbial mineralization for reducing surface efflorescence on cement based materials. After adding bacteria into the specimens made of cement-based material, the content of Ca(OH)2 and porosity reduced gradually from surface to inside within 10mm thickness. As well as, the surface area of efflorescence on specimens reduced dramatically. Based on the framework of thermal dynamics, diffusion control theory and the theory of calcium concentration in pore solution, the model of calcium ion leaching for the efflorescence on cement based material was built. Furthermore, numerical simulation analysis of cementitious materials induced by bacteria was conducted according to this model.
The conclusion was coordinated with the experimental result. Compared with the traditional methods, the microbial mineralization method can inhibit efflorescence on cement based materials and the costs reduced significantly. This novel technology is expected to be used in practical applications in near future.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00