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The behaviour of concrete blockwork piers with a 1:1:6 mortar mix, under different sustained loads, at constant temperature and humidity is described. An attempt is made to establish a relationship between creep strain in blockwork and the ratio of applied stress to the strength of blockwork.
The Martigues Viaduct was begun in 1969 and came into operation in June 1972. It is 874 m in length and consists of a central metal structure framed by two access viaducts in prestressed concrete. The reasons why a bridge was considered necessary are given, followed by details of its construction.
The strength of a concrete member subjected to torsion will be governed by the tensile strength of the concrete. The author has collected all the experimental data available on concrete in torsion and shows that the results agree reasonably well with this statement if the split cylinder strength is taken as the tensile strength of the concrete.