This paper discusses the influence of natural fibres on density, compressive strength and
flexural strength of fibre reinforced concrete specimens. Coir fibre extracted from coconut husk
was added to high strength concrete to produced 36 test cubes and 36 beam samples. Tests
carried out on cube and beam samples show that compressive strength of high strength
concrete reduces with addition of coir fibres. The reduction is noticed varying with the change of
fibre content and fibre length. Further, comparison between cubes and beams indicate variation
in density of the concrete as well. The test results show that a reduction in flexural strength in
most cases except for 2% coir fibre reinforced concrete, where a slight enhancement was notice in flexural strength.