Study on the improvement of wear resistance of the enamel with etching by surface sealing during orthodontic treatment;

Application of optical method to the measurement of concrete surface crack;

Influence factors on surface crack of semi-rigid base course;

Prevention and treatment of irregular ruptured slabs and surface cracks of airport runway;

This paper analyses on the reasons of surface cracking of commercial concrete, and puts forward some concrete measures for field control of surface cracking of commercial concrete.

The reflective cracking and the surface cracking in the semi-rigid pavement are common under the sudden temperature changed and continuous low temperature for its sharp contraction characters produced by the change of temperature and humidity.