RELIABILITY STUDIES ON THE HYSTERESIS BEHAVIOUR OF MASS CONCRETE MIXED WITH PLASTIC FIBRE UNDER COMPRESSION

Summary

The research work entails studying the reliability state of mass concrete mixed with plastic fibre under compression.
Concrete is known to be a comparative brittle material when unreinforced, thus when concrete is reinforced with fibre,
the compressive strength of the composite system increases. However, with additional loading, the fibre reinforcing
will be activated, to hold the concrete mix together. This study investigated the effect of plastic fibre on compressive
strength of Plastic Fibre Reinforced Concrete (PFRC) at 1:2:4 nominal mixes at different percentages of plastic fibre.
The mix proportion was 1: 2: 4 with water cement ratio of 0.7. The slump was found to be 162 mm. PFRC cubes used
were cast in 100 x 100 x 100 moulds. All samples were cured in water and tested for 7, 14, and 28 curing age. The
density of PFRC increased with curing age which implies that during curing concrete absorbs water which aid its
hydration The samples were crushed to determine the compressive strengths. The results of the study show that PFRC
has an average compressive strength ranging from 25.6N/mm2
to 36.1N/mm2
. The reliability index at 100years for the
compressive strength of 0%, 0.1%, 0.2%, and 0.3% of PFRC is 0.6889, 0.7124, 0.6922 and 0.693 respectively. This
indicates that PFRC has high reliability index

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