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2. Bouzoubaa, N; Zhang, M.H. and Malhotra, V.M. (1999). Production and performance of laboratory produced high - volume fly ash blended cements in concrete. CANMET/ACI International Symposium on Concrete Technology for Sustainable Development, Vancouver, Canada, April 19 - 20, pp 1 - 13.
3. Page, M. and Spiratos, N. (2000). The role of superplasticizers in the development of environmentally- friendly concrete. CANMET/ ACI International Symposium on Concrete Technology for Sustainable Development, Vancouver,BC, Canada, April 19 - 20, 15p.
4. British Standard Specification BS 1881 Part 2: Methods of testing fresh concrete, London; 1970.
5. British Standard Specification BS 4550 Part 3: Methods of testing cement, London; 1978.