Some methods to clean pH electrode are introduced,such as ultrasonic cleaning,mechanical cleaning,water jet cleaning,chemical solution jet cleaning,compressed air jet cleaning,composite cleaning,manual cleaning,and so on.

Selection of aggregate reclaiming equipment in artificial sand-gravel aggregate plant in Xiaanxi of the Three Gorges;

The application of artificial sand and river sand in ready-mixed concrete;

Probing on application of masonry sand pulp with artificial sand;

Experimental study on mechanical properties of manufactured sand fly ash concrete;

Study on the use of the manufactured sand in the plaster;

Based on the tests in laboratory on the concrete composed of manufactured sand and fly ash,the relationships of the strength of concrete and the binder to water ratio are analyzed by the method of liner regression and the coefficient values of α-a and α-b are determined respectively.