HYDRAULIC BEHAVIOR OF CALCIUM SULFOALUMINATE-BASED CEMENTS DERIVED FROM INDUSTRIAL-PROCESS WASTES

The manufacture of cements based on calcium sulfoaluminate (C4A3SBAR) requires lower firing temperatures and lower grinding energy, as comp ared to ordinary Portland cements (OPC). Some of these low-energy ceme nts can be formulated in order to develop high early strength and othe r performances similar to OPC. Further interest towards these types of cements relies on the possibility of using industrial process wastes as raw materials for their manufacture. It has been found that a numbe r of industrial wastes and by-products such as phosphogypsum, bauxite fines, fly ash and blast furnace slag, can be employed without negativ ely affecting the hydraulic behaviour of cements of planned C4A3SBAR:b eta-C2S:CSBAR weight ratio 1.5:1:1. Blast furnace slag and fly ash can also be advantageously used as blending components of the fired produ cts.