Vol.25, No.3, 2025, pp. 427–431
https://doi.org/10.69644/ivk-2025-03-0427

This research aims to investigate the effect of using carpet waste fibres in improving the resistance properties (slump, density, compressive and tensile strengths) of concrete. The fibres used in this research include sinuous fibres with black colour and 40 mm length and 0.4 mm diameter, which has a specific gravity of 0.91. Samples used in this research include sample A as a control sample, sample B containing 0.25 %, sample C with 0.75 %, sample D with 1.25 %, and sample E with 1.75 % of carpet waste fibres. Results of the slump test show that concrete slump decreases due to the addition of carpet waste fibres, and the higher the percentage of carpet waste fibres the greater the resistance. The density of fresh concrete will decrease due to the addition of carpet waste fibres. Results of the concrete strength test show that compressive and tensile strength and modulus of elasticity increase due to the addition of carpet waste fibres. Flexural strength increases the most due to the addition of 1.75 % of waste fibres. Water absorption of concrete decreases by adding different percentages of carpet waste fibres.

Keywords: • carpet waste fibres • compressive strength • tensile strength • recycled concrete