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The paper attempts briefly to record and describe the construction of this unique combination of structure and machine, and the care and attention provided over the years to produce, in the opinion of the authors, a regeneration of the best known bridge in the world, now approaching its centenary. L.W. Groome, W.I. Halse, E.M. Longton and D.L. Stephens
During recent years, there have been numerous innovations in concrete technology which have resulted in the availability of materials with properties that are very different from those of conventional structural concretes. These materials include fibre-rein forced and polymer-modified concretes, high-strength concrete, macrodefect-free cements, self-levelling and high workability concretes, and many others. In addition, there has been greater interest in the use of waste materials such as ground granulated blas[furnace slag, pulverised .fuel ash or silica fume. Some of these materials have found no immediate application. J.L. Clarke and C.D. Pomeroy
Box spine-beam bridges in prestressed concrete have become a widely used form of construction for spans in the range 20 m to 150 m. However, if inclined webs are adopted with prestressing tendon profiles parallel to those webs, the effects of longitudinal prestressing can give rise to significant transverse forces in the top and bottom slabs. R.M. Spiller, R.E. Kromolicki and M.I. Danglidis