Doctor of Concrete—Self-healing - The Issues and Discussion of Modern Concrete Science - page 148

Fig. 12.2 A scrapped specimen digged out by the author

The reason why the author tirelessly introduces whole process of this matter is
that this discovery has great meanings on studying self-healing. As the author knew
station master Gao Su-mei, in construction of Hohhot Airport, the author got in
touch with her after making a call. The author arrived at their laboratory gate and
had a look at the footpath; meanwhile, a specimen was digged out to test strength
on press machine.
Figure 12.2 had shown a scrapped specimen which was digged out by the
author, and the original writings were clearly visible. The underyear scrapped
specimen was shown in Fig. 12.3 . Compressive experiment on the specimen for the
second time was shown in Fig. 12.4.
Number on the press machine showed that the tested strength was 68.7 MPa,
which was twice of the previous strength (Fig 12.5 ).
After the experiment, it is believed that this is self-healing phenomenon.
Station Master Gao Su-mei contacted with the author in 2006 and told the author
that construction of a crossbeam of a tall building in Hohhot ceased when a half of
it was finished due to stoppage of construction machinery, and it was wholly
accomplished after 2 days. It is unacceptable in construction speci

cation. A crack
generated from the linkage place 2 days after completion. But the crack disappeared
after curing for a month. However, owner, supervisor, and construction enterprise
held different opinions about this matter. Quality Supervision Station had drilled
core samples at the linkage place where the crack generated, and the core samples
were testing right now. She asked whether the author could come or not to discuss it
together.