Effect of Technohyper N Superplasticizer and Durafiber 18 Fibres on the Fresh and Hardened Properties of Concrete

Abstract

Concrete forms the backbone of modern construction due to its strength and durability. However, evolving construction demands have necessitated the enhancement of its performance through the use of chemical and mineral admixtures. This study investigates the influence of a superplasticizer (Technohyper N) and fibre reinforcement (Durafiber 18) on the fresh and hardened properties of concrete. Ten concrete mixes were prepared, including a control mix and others containing different dosages of each additive (0.8%, 1.2%, and 1.8% of cement weight for the superplasticizer; 1.5, 2.0, and 2.5 kg/m³ for the fibres), as well as combined mixes. Workability (slump), water absorption, and compressive strength tests were performed. The results showed that Technohyper N significantly improved workability (slump of 120–123 mm) and enhanced compressive strength, particularly at 28 days, with an optimum dosage observed. Durafiber 18 contributed a slight improvement in compressive strength, whereas the combined mixes exhibited lower strength than the control, indicating no clear synergistic interaction. Additionally, the superplasticizer substantially reduced water absorption, suggesting enhanced density and durability.