The effects of different gypsum on portland cement properties and hydration process were investigated through analysis testings on raw materials property, cement physicomechanical property and hydration product by SEM. Test results show that cement strength would be decreased when adding anhydrite than adding dihydrate gypsum. The cement which added with semi－hydrated gypsum need more water, but less strength is obtained in early stage. Phosphorous gypsum makes cement condensation time prolonged, while give no evidence influence on cement strength. Using fluorine gypsum as retardant, good effect has obtained on cement strength and no defect is found on cement properties.

JUS which is composed of polycarboxylic component and other components having water reducing capability is a kind of high performance water reducing agent. In the paper, the effects of JUS on the rheological property of cement paste were examined and the action mechanisms of JUS were studied by means of ζ potential,combined water, heat of hydration, DTA, TGA and so on.

Rotor scale is a device used in cement industry for accurate measure and transport of powdery coal . This paper introduces the basic feature of CAN controller, and presents the hardware and software design about P80C592 chip with CAN controller in the control system of rotor scale.