Experience with the production of a cement clinker for road pavement cement at the Gorazdze cement works

Various cement clinkers were produced by burning mixtures of the raw materials limestone, limestone marl, siderite (FeCO3), silica fume and dolomite in a laboratory kiln for two hours at I 1430 degrees C. Cement clinkers with alite and belite contents of 77-79% by mass, fen ate contents of 9-10% by mass and alu minate contents of less than 8% by mass proved particularly suitable for producing road pavement cement. The cements ground from them at the Gorazdze cement works With an average specific surface area of about 2700 cm(2)/g had an average initial setting time of 2.5 h and a final setting time of 3.5 h as well as 3 day compressive strengths of 26.8-33.5 MPa and 28 day compressive strengths of 49.3-58.6 MPa.