Doctor of Concrete—Self-healing - The Issues and Discussion of Modern Concrete Science - page 159

Fig. 12.14 continued

1. Choosing cement correctly

In summary, generation of self-healing phenomenon mainly depends on cement
particles that are unhydrated at earlier stage. Therefore, when choosing cement, we
must consider increasing of strength at earlier stage as well as self-healing ability at
later stage so as to take account of early and later stages. Thus, high fineness, high

early strength, and high grade strength cement, are not our first choice.

2. Selecting construction time reasonably, so as to improve project quality and
durability.

Lengthening cement hydration time and decreasing cement hydration speed,
especially hydration speed at earlier stage, have great signi cance on improving

self-healing ability.

12.4 Ending Words

To sum up, self-healing ability is one of the important and favorable performances
of concrete. In the past, this performance was rarely mentioned and never be
utilized due to our construction site work was not carefully enough. In modern
concrete circumstance this years, self-healing ability is getting poorer and poorer,
and thus it is different to be discovered, resulting in that many people are unfamiliar
with self-healing and even regard this performance does not exist in concrete.