rapid-setting csa cement,calcium sulfonamide cement

A rapid-setting cement, also known as calcium sulfoaluminate cement, is substantially different from ordinary portland cement (OPC) in its setting behavior and strength development profile. This cement already has a substantial market with good prospects for further market development. As the raw materials requirement and the phase composition of these cements are different from those required for making OPC, they fall under the category of special cements. Also, production of these cements requires processing temperatures that are 200 to 300C lower than those necessary for OPC; and, because of lower firing temperature, the pyroprocessed product is softer and substantial energy can be saved in the grinding process.

Rapid-setting cement is used in many applications such as bridge decks, airport runways, patching roadways, sidewalks, etc. where rapid strength development is necessary. Recently, sections of concrete highways have been built with this cement. In addition, it may be modified for use in shrinkage compensated concrete by mixing with portland cement and for controlled low-strength materials (CLSM) used for diggable back-filling of utility trenches. A 1996 survey indicates that 81,000 metric tons of rapid-setting cement was produced in the U.S. In recent years, the use of rapid-setting cements has increased substantially, as more and more technical data are generated in regards to their performance and durability.

Rapid-setting cement is not produced in the State of Illinois, and commercialization of this technology will have substantial commercial advantage. Two of the reasons that rapid-setting cement is not used extensively are its availability and price. Use of waste sludge makes it cheaper and will also encourage building of new plants. .