1. self contraction.
Due to the high performance concrete in water evaporation and condensation of microtubule contraction, make the concrete surface fission, anti-carbonation of high performance concrete, freeze-thaw cycle effect and anti chloride ion diffusion is disadvantageous, reduces the durability of high performance concrete;
2. The surface crack caused by wet expansion.
High performance concrete has high cement content and low water cement ratio. After hardened, a long time in the water, the moisture diffuses to the inside through the microtubules, and the unhydrated cement particles further hydrated and expand, which will also cause cracks on the surface of high performance concrete.
3. the stress-strain curve of high performance concrete is different from that of ordinary concrete. It can not be used to analyze the high performance concrete with the fixed theory of ordinary concrete.
