Impact Resistance of Fibre Concrete

摘要

A description is given of the determination of the impact energy of concrete reinforced with discontinuous fibers of steel or twisted fibrillated polypropylene film. The design and instrumentation of a Charpy type of pendulum impact test machine is outlined, the machine being capable of completely fracturing in a single blow fiber concrete beams measuring 100 x 100 x 500 mm. This machine was used to determine the energy absorbed in the fracture process, both from the amplitude of the pendulum swing and also from the record of force developed on the pendulum head during the impact. The latter method enabled the energy absorption to be determined with respect to the central deflection of the test beam in a manner analogous to energy determination from the area under a conventional slow-rate load-deflection curve. A variety of steel fiber types and two lengths of chopped fibrillated polypropylene film were used to produce composites with two fiber volume fractions and these were tested at two ages. (Copyright (c) Crown Copyright 1981.)