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Self healing effect of ceramsite loaded microorganisms on concrete cracks

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Document pages: 8 pages

Abstract: Due to the harsh conditions in concrete, the protective carrier is very important for self-healing concrete cracks by microbial induced CaCO3 precipitation. Porous ceramsite was used as microbial carrier in this paper. The load of ceramsite was increased by heat treatment and NaOH immersion for the first time. The viability of bacterial spores was evaluated by urea decomposition measurement. Then, the self-healing efficiency of spores on concrete cracks is evaluated through a series of tests, including compressive strength recovery, water absorption and crack appearance inspection. The results show that heat treatment can increase the load content of ceramsite, but will not reduce the effect of ceramsite on concrete strength. The optimum heating temperature is 750 ℃ 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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