EVALUATION OF ALTERNATIVE SETTING RETARDERS IN CEMENT
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Published:2002
G Tzouvalas, Stamatis Tsimas, Aristotelis J Papageorgiou, 2002. "EVALUATION OF ALTERNATIVE SETTING RETARDERS IN CEMENT", Innovations and Developments In Concrete Materials And Construction: Proceedings of the International Conference held at the University of Dundee, Scotland, UK on 9–11 September 2002, Ravindra K. Dhir, Peter C. Hewlett, Laszlo J. Csetenyi
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The constant use of natural gypsum as setting retarder in cement has led to the reduction of its high purity stock in Greece. The aim of this project was to investigate the possible displacement of natural gypsum (CaSO4·2H2O) in cement (CEM I and CEM II types) with alternative setting retarders such as: i) anhydrite, ii) phosphogypsum and iii) FGD gypsum. These calcium sulphate bearing materials (CBSM), alone or in mixtures, were ground with clinker both in laboratory and industrial scale in order to examine their influence on the physical and mechanical properties of cement, as well as on the industrial production line of cement. The project also included a comparative study of the influence of these materials on the solubility of cement. From the present work, it is extracted that the use of mixtures of sulphate bearing materials with gypsum seems to be advantageous for the actual control of setting time, without having any negative effect on the compressive strength of cement.
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EXPERIMENTAL
RESULTS AND DISCUSSION
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