Constitutive Composite Matrix -Carbon Composite Fibre

The use of short pitch-based carbon fibers (0.05% of weight of cement 0.189 vol. % Concrete) together with a dispersant chemical agents and silica fume in concrete with fine and coarse aggregates resulted in a flexural strength increase of 85% and a flexural toughness increase of 205% a compressive strength increase of 22% and a material price increase of 39%. The slump was 4 in at a water/cement ratio of 0.50. The air content was 6% so the freeze-thaw durability was increased even in the absence of an air entertainer. The aggregate size had little effect on the above properties. The minimum carbon fiber content was 0.1 vol. %. The optimum fiber length was such that the mean fiber length decreased from 12 mm before mixing to 7 mm after mixing which used a Hobart mixer. The drying shrinkage was decreased by up to 90%. The electrical resistivity was decreased by up to 83%.To investigate the effect of carbon fibres on M20 concrete. The parameters considered percentage of carbon fibres (0.10.5&0.1%) and three aspect ratios (5075100).Compressive strength tensile strength are the two major properties are to be investigated.