Distribution of Calcium Carbonate in the Process of Concrete Self-healing

钱春香^1,2，LI Ruiyang^1,2，LUO Mian^1,2，CHEN Huaicheng^1,2

1. School of Materials Science and Engineering, Southeast University2. Research Institute of Green Construction Materials, Southeast University

摘 要：The complete deposition distribution process of calcium carbonate is summarized in three directions of cracks. Distribution of calcium carbonate in the self-healing process of microbial concrete is studied in detail, with the help of a variety of analytical techniques. The results show that carbonate deposits along the x-axis direction of the cracks. The farther from the crack surfaces of concrete matrix in x-axis direction, the more the content of the substrate, the less content of calcium carbonate. Gradual accumulation of calcium carbonate along the y-axis direction is like building a house with bricks. Different repair points are gradually connected, and ultimately the whole of cracks are completely filled. In the z-axis direction, calcium deposits on the surface of fracture direction, when the crack is filled on the surface, because the internal crack hypoxia in the depths of cracks hardly produces calcium carbonate.

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