Title: Carbon Fiber Reinforced Concrete for Bus-pads

Author(s): Rishi Gupta

Publication: Web Session

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Date: 4/1/2021

Abstract:
With a prime objective of crack control in concrete due to shrinkage, loading, corrosion, etc., the use of synthetic fibers in concrete have become predominant since last decade. In past it has been observed that concrete slabs laid at bus stops (known as bus-pads) undergo severe deterioration due to sudden application of brakes. These slabs quickly develop cracks that widens over a shorter time span. This significantly impacts the service life of the bus-pads thereby increasing repair and maintenance costs. The proposed work focusses on the developing cementitious materials using both pitch and pan-based carbon fibers obtained from different sources, for their application in bus-pads. The lab-based crack free fiber reinforced composite has been used in construction a bus-pad laid at UVIC bus-loop. The presentation includes the details of application of material at bus-pad. Different fiber volume concentrations such as 0.5%, 1%, 2%, 3% and 10% have been used for developing mortar samples (cubes, beams, and dog bones). Further, the fibers of different lengths such as 6 mm, 12 mm and 18 mm were considered. The mechanical characteristics of carbon fiber reinforced mortar such as compressive strength, tensile strength and flexural strength was evaluated. It was found that fiber reinforced mortar samples with a volume concentration of 1 % and fiber length as 18 mm yielded an approximate 10 % increase in compressive strength and flexural strength. An increase of 15 % for tensile strength was observed for the same combination of fiber volume and fiber length. Further, post-crack strength analysis was also performed on force-displacement data obtained from the flexural strength. It was found that higher concentration above 1 % of fibers in mortar yielded greater post crack strength.