Potential use of recycled aggregate as a self-healing concrete carrier

Liu, Chao; Lv, Zijian

doi:10.1016/b978-0-12-818961-0.00026-0

Cited by 1 publication

(1 citation statement)

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“…This process reduces concrete cracks to improve the strength and durability of the structure and addresses the structural maintenance needs of reinforced concrete. Microbial mineralization highlights the green properties of concrete more than other self-healing methods, as it is a natural process and environmentally friendly [ 41 ]. The self-healing process is directly related to calcium carbonate (CaCO 3 ) production, which depends on many factors, including the concrete pH, microbial carriers and the amount of Ca 2+ (free-state) in the concrete [ 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Performance of Recycled Coarse and Fine Aggregates as Microbial Carriers Applied to Self-Healing Concrete

Duan

Xiao

et al. 2023

Materials

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The contradiction between the scarcity of natural resources and the demand for construction materials has given rise to the application of recycled aggregates. Microbial self-healing concrete (SHC) is a clean and smart material, and its carrier has a great influence on repair performance. In this paper, recycled coarse aggregate (RCA) and recycled fine aggregate (RFA) were used as carriers, and their different repair effects over time were intensively investigated. The results showed that the RCA carrier had a better repair effect compared with that of RFA, and the maximum healing width could reach 0.27 mm by 28 day. The microbial repair efficiency was significantly influenced by the distribution of old mortar, with the RFA specimen having a small volume and wide distribution of repair products, while the RCA repair showed a centralized tendency. In addition, SEM, MIP and XRD characterization were used to analyze the repair mechanism. The time-dependent repair model was developed, and the applicability of the model for concrete enhancement under microbial repair was verified through experimental results. The research results could promote industrial applications by giving intelligent and green properties to recycled aggregates.

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Section: Introductionmentioning

confidence: 99%