Sodium sulphhate and quick lime were added into fly ash and portland cement blend system which the ratio of fly ash was 50% to excite the early activity of fly ash,the early strength of the blend cement system was studied,and the misrostructure of hardened pastes was analyzed by R-ray diffraction and scanning electron microscope.

This method is also used to determine the fractal structure of fly ash cement pastes.

The coal ash gum is made from the coal ash produced in power plants.

On the basis of reviewing the testing data of flyash cement concrete pavement and observing pavement current status, the conclusion in this paper has been reached that flyash cement concrete pavement is suitable for high grade highway pavement in Northeast area of China.

This paper presents influence of complex activation and mechanical activation on powder properties as well as physical and chemical performances of Portland fly-ash cement paste.

This paper, aiming at the weak points of the low early strength and the slow setting and hardening of portland fly-ash cement, according to the forming mechanism of cement clinker minerals, cement clinker minerals are choosen, fly ash is used as a substitute of clay as raw materials, early and high strength type cement clinker has heen developed, the amount of alit in the clinker is very high.