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External, unbonded tendons have attracted much attention recently, while internal, bonded tendons have come into criticism and are going out of favour. It is important in future projects where external tendons are going to be used that suitable details and techniques are developed to give the desired strength and durability. A lot can be learnt from the way external tendons are used in other parts of the world, where the feature is more common. This paper describes the design of the Bangkok Second Stage Expressway which is currently under construction using the latest techniques developed in the United States and France and is one of the largest ever uses of external tendons for a viaduct project. N.R. Hewson
Grouted post-tensioned concrete as a bridging material is compared with alternative choices for regularly occurring situations. Some examples are presented, and a commentary on comparative performance is included. Grouting of tendons is dealt with in some detail covering the development of current methods, design criteria, details, and inspection methods. The paper draws some tentative conclusions on the future of the material. M.V. Woolley and G.M. Clark
In the Building Act 1984 there came into force legislation which would allow private persons to act either as Approved Inspectors or Approved Persons. This had resulted from the Government’s intention to make building control more open to competition and to allow professionals to be involved in certifying not only their own work, but also that of others. The legislation, which was carried further by the coming into force of the Building (Approved Inspector, etc.) Regulations 1985, set down certain of the details which would be required to be satisfied which included, among other things, the matter of insurance. It was principally on that one point that the scheme foundered from l985 until the latter part of last year. B.A. Cox