Fracture energy, strength, shrinkage and expansion properties of cement mortar are studied under different moisture content and surface tension solutions.
The rate of nomal fracture is keeped about 97% by optimizing roll gap shrinkage and strengthening management of second cooling and Fan-paragraph, according to now level of casting machine.
When the shrinkage of the rod fracture surface much more than that of the cup part fracture surface, its formation by compound extrusion is not applicable.