Doctor of Concrete—Self-healing - The Issues and Discussion of Modern Concrete Science - page 156

12.3 Application of Self-curing Principle During Practical
Engineering

Utilization of self-healing principle can change quality-de cient projects into non-

defective ones, even bas effect of bringing the dying back to life on scrapped
projects.
No matter airport concrete in Xinjiang whose surface generates loss of dehy-
dration cracks or crossbeam of a project in Hohhot of Inner Mongolia, they both
become safely used even non-defective structures from probably scrapped project
as for self-healing ability. In 2006, together with engineers of Xi Qing, Ye Shao-fu,
Hou Jun-gang, Wang Shuo, Du Jing-zhong, Yuan Xiao-juan, et al., the author built
up an experimental group to repair a ruptured concrete slab at runway of Hohhot
Airport by adopting this principle. The ruptured concrete slab, as shown in
Fig. 12.13 , must be eliminated and abolished.
Repairing process is as follows:

1. Eliminating partially ruptured concrete in crack direction.
2. Blowing away dust in linkage place by high pressure air gun.
3. Curing linkage place via running water adequately.
4. Placing newly mixed concrete on linkage place afresh.
5. Curing for 7

28 days adequately.

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From 2006 to right now, the concrete slab is always under secure use. Pictures in
Fig. 12.14 have shown process of repairing and condition after curing.

Fig. 12.13 A relatively serious crack on concrete slab