Self‐Healing of Concrete Cracks by Ceramsite‐Loaded Microorganisms

Xu, Jing; Wang, Xianzhi; Zuo, Junqing; Liu, Xiaoyan; Iafisco, ed., Michele

doi:10.1155/2018/5153041

Self‐Healing of Concrete Cracks by Ceramsite‐Loaded Microorganisms

Journal Article · Sun Jun 24 00:00:00 EDT 2018 · Advances in Materials Science and Engineering

DOI:https://doi.org/10.1155/2018/5153041· OSTI ID:2426969

Xu, Jing; Wang, Xianzhi; ; ; Iafisco, ed., Michele

Protective carrier is essential for the self‐healing of concrete cracks by microbially induced CaCO ₃ precipitation, owing to the harsh conditions in concrete. In this paper, porous ceramsite particles are used as microbial carrier. Heat treatment and NaOH soaking are first employed to improve the loading content of the ceramsite. The viability of bacterial spores is assessed by urea decomposition measurements. Then, the self‐healing efficiency of concrete cracks by spores is evaluated by a series of tests including compressive strength regain, water uptake, and visual inspection of cracks. Results indicate that heat treatment can improve the loading content of ceramsite while not leading to a reduction of concrete strength by the ceramsite addition. The optimal heating temperature is 750°C. Ceramsite particles act as a shelter and protect spores from high‐pH environment in concrete. When nutrients and spores are incorporated in ceramsite particles at the same time, nutrients are well accessible to the cells. The regain ratio of the compressive strength increases over 20%, and the water absorption ratio decreases about 30% compared with the control. The healing ratio of cracks reaches 86%, and the maximum crack width healed is near 0.3 mm.

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Sponsoring Organization:: USDOE

OSTI ID:: 2426969

Journal Information:: Advances in Materials Science and Engineering, Journal Name: Advances in Materials Science and Engineering Journal Issue: 1 Vol. 2018; ISSN 1687-8434

Publisher:: Hindawi Publishing CorporationCopyright Statement

Country of Publication:: Egypt

Language:: English

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