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Mr J. A. Emery (Advanced Construction Materials Ltd) The authors of this paper have made a valuable contribution to our knowledge of the performance of limestone concrete aircraft pavements under thermal shock conditions. Their development of new concretes having improved jetblast resistance is of great interest, but the following comment from World Air Power Journal, Vol. 6, Summer 1991, p47, does beg the question should a specialised concrete surface be necessary at all?
Bond and flexural behaviour of concrete beams with fusion-bonded epoxy-coated reinforcing bars have been investigated under static load, repeated load, and sustained load. Embedment lengths were varied in the static load tests, (16, 20 and 28 diameters for 25mm bars, and 16, 20 and 33 diameters for 12mm bars). Both coated and uncoated bars were employed in all three series of tests. Relative bond behaviour and flexural performance of epoxy-coated bars are evaluated and discussed in comparison with uncoated bars. Professor A.R. Cusens and Z. Yu
The recent successful completion of two major incremental launch bridges in the UK - Dornoch Firth Bridge and River Ceiriog Viaduct - has refocused attention on this form of construction after a break of nearly 15 years. The paper sets out the philosophy behind their design and construction compared to both the earlier examples built in the UK and some of their foreign counterparts. F.N. Rowley