EFFECT OF FIBRE LENGTH AND PERCENTAGE OF SISAL ON STRENGTH OF CONCRETE

Abstract

Natural fibres are used since many centuries for different purposes since the beginning of civilization. They have been used for ropes, toughening of pots etc since many centuries. Natural fibers are of two types. Natural inorganic fibers such as Basalt, Asbestos etc and the other are the natural organic fibers such as coconut , palm, kenaf, jute, sisal, banana, pine, sugarcane, bamboo etc. The natural fibers are investigated by different researchers as construction materials that can be used in cement paste/mortar/concrete. The present work is carried out to evaluate the compressive, Tensile as well as Flexural strength of concrete using sisal fibres as reinforcement. By using different fibre Aspect ratio and fibre percentage, effect on compressive strength of concrete cube specimen for various combinations is studied. The fibre diameter was first observed through micrometer gauge and was seen to be average 0.3mm. Fibres used with aspect ratio 50, 75,100 and the percentage of 0.5%, 1%, 1.5% and 2% were used for the work. Normal M20 mix was used for the study. The experimental work was carried out for twelve different combinations. The obtained specimens were subjected to tests aimed to check the compressive strength. An increase in compressive strength by 69.27 % and was observed at 1% fibre and 50 A.R.