The decks assemblies, without concrete, were first loaded to 30 mm deflection. They were then unloaded, cast, allowed to cure, and tested to destruction. The manufactured beam assemblies were tested over a 5.4 m and a 6 m span, also with a central point load. They were initially loaded to 30 mm deflection then released. The concrete was then cast, allowed to cure, and the whole system tested to destruction.
Testing is shown in The results of the tests of the five logs decks is shown in fig.
Log-Deck Test Results. Table 1 details the relative increase in stiffness of the cast units compared to the log decks without concrete. The largest consistent increase in stiffness was with Deck 2, the deck with dove tailed grooves. This system spread the shear forces over the widest area of timber and performed well until the timber began to split away longitudinally from the base of the grooves. This system did not have the ductile failure seen with the dowel system of Deck 3.