Calcium Sulpho-aluminate Cementitious Compositions

Studies conducted by Klein in the 1950’s led to the development of Calcium Sulphoaluminates (CSA) cements which have some special properties, such as accelerated hardening and shrinkage compensation and have advantages over normal Portland Cement. However, due to the more widely distributed raw materials, advanced production technology and scale of operation Portland Cement can be produced much more cheaply and efficiently all over the world. The use of Calcium Sulphoaluminate cements has therefore been restricted to niche applications such as for rapid hardening and shrinkage compensating grouts.

This paper examines the possibilities of producing the CSA compositions in the conventional cement kilns with coal as fuel and with use of industrial by products as the raw materials. This could facilitate their production on a commercially feasible scale for a range of uses including mortars and concretes for general construction.

The paper discusses the properties of the CSA cementitious composition produced with use of Lower grades of Limestone, Industrial Lime rich waste sludge from paper, fertiliser & sugar industries, byproduct boro-gypsum / phospho-gypsum / chemical gypsum and fly ash at lower temperatures of 1200 – 1250 oC, providing an environmentally friendly option to OPC. The Paper was presented and published at 8th NCB Int Seminar

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