EXPERIMENTAL INVESTIGATION OF AUXETIC MATERIAL BY USING FIBRE RUBBERIZED CONCRETE

Abstract

This work presents the mix design and the analysis of the strength of rubberized concrete. The carbon
fibre are cut in prescribed ratio and used for the partial replacement of coarse aggregates.
In the proposed research, carbon fibres were mixed with the concrete to form a Rubberized concrete. For a rubberised
concrete mixture, all mix design parameters were kept constant as given by the IS-456 method except for the coarse
aggregate constituents. The coarse aggregate of the concrete was replaced by 5%, 10%, 15%, and 20% of its weight.
The fine aggregate was sieved using 2.36mm in order to pass through the holes of the carbon fibre to make a strong
contact with cement matrix.
From the some experimental results of compressive strength testing it was observed that both plain and rubberized
concrete developing similar strength over the curing period as expected. For all concrete mixtures, the rate of
compressive strength developed was high between 7 and 14 days and slow between 14 and 28 days. Also it was noted
that irrespective of curing period, there was a systematic reduction in compressive strength with increasing rubber
content of the composite. Some experimental investigation observed that high percentage carbon fibre mixed cylinders
took longer time to crack down because of the elastic nature of the fibres when bearing the loading. Moreover, it was
observed that the above said rubberized concrete did not exhibit brittle failure under compression or split tension.