ABSTRACT
Large amounts of by pass-cement dust (BCD) are formed by cement plants – which reached 3.3 million ton per year -and disposed in different areas in Egypt. This hazardous dust is expected to increase as a result of increasing cement plants in next few years. Consequently, an increase in the environmental pollution is expected which will affect the health of the citizens, their instruments and tourism in some areas in Egypt. It is important to find different applications to consume this dust as a method to overcome its environmental pollution problems. Curbstones were manufactured on semi-industrial scale at Factory-45 with dimensions 0.3×0.2×0.5 m, each containing 59 kg BCD. They can be used in the central reservation areas of the d roads , in such a case about 944 thousands ton of BCD per year can be consumed. Stabilization of sandy roads was performed in two trial sections nearby 6-October City, by erecting a compact surface layer of 5 cm thickness containing 35 kg of BCD per meter square. Such application can consume 175 thousand ton of BCD per year for stabilization sandy road of one thousand km length and of 5 m wide. An asphalt road of 2 km and 6-8 m width has been paved at Torah Portland Cement Co. In this trial section, special asphalt mixes containing iron slag were designed to be used as the surface, binding and base layers. In the surface layer 5% BCD powders were included while in the base layer 12% BCD were included. When this application is used for the surface layer, and for 25% of base layers, 120 and 345 (thousands) ton of BCD would be consumed per year. The present applications would assimilate about 1.6 million ton of BCD per year