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Tests carried out by British Railways have proved that in pretensioned members, stress causing cracks is about 1000 psi for concrete with 28-days' cube strength of 7000 psi; description of tests on ties, bridge beam 50 ft long, and on eaves beam 40 ft long carrying central concentrated load from 78-ft roof beam; cracks were caused by shrinkage.
Tests carried out by British Railways have proved that in pretensioned members, stress causing cracks is about 1000 psi for concrete with 28-days' cube strength of 7000 psi; description of tests on ties, bridge beam 50 ft long, and on eaves beam 40 ft long carrying central concentrated load from 78-ft roof beam; cracks were caused by shrinkage.
Tests of prestressed precast concrete
Concrete Constr Eng
Abeles, P.W. (author)
1954
5 pages
Article (Journal)
English
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