The influence of sucrose dosage on Portland cement's setting time,strength development,chemical binding water,ion concentrations in paste liquid phase of AFt content was studied.

The relationship between the fineness and particle gradient and the strength development of slag Portland cement with the addition of large volume slag was therefor determined.

This paper discussed the factors on the strength development of alkali-activated steel-blast furnace slagcement,such as the quantity of the mixing steel slag,the alkaline components and the curing condition,in both ofmacroscopic and microscopic ways.

Moderate Development of Libraries at the E-Age;

While developing and utilizing nat ure,man should obey the principles of coordinate coexistence,moderate development and ethics in order to realize the harmonious coexistence and coordinate dev elopment of man and nature.

Although virtual economy in China,which is still developing,has not yet become mature,it is necessary to learn the lesson,absorb the experience,and guarantee its moderate development.