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2. American Society of Testing Materials 1989. Annual Book of ASTM Standards, Part 14, Concrete and Mineral Aggregates; Manual of Concrete Testing. Especially standards C-294, C-295, C-457, C-823 and C-856.
3. Barnes, P. & Ghose, A. 1983. The microscopy of unhydrated Portland Cement. In : Barnes, P. (ed.) Structure and Performance of Cements. Applied Science, London, 139–203.
4. British Standards Institution 1975. Methods of Sampling and Testing Mineral Aggregates, Sands and Fillers: BS 812.
5. British Standards Institution 1981. Code of Practice for Site Investigations: BS 5930.