Experimental investigation on fresh and hardened properties of high strength fibre reinforced concrete using GGBFS and micro silica

Resumo

The use of High Strength Concrete (HSC) has increased now a days. The concrete is one of the most useful construction materials, but the major defects of concretes are brittle in nature, low workability and low tensile strength. Experimental study is carried out to assess fresh and hardened properties of high strength fibre reinforced concrete (HSFRC) of grade M70. In
addition to normal materials, silica fume and GGBS are added to achieve higher strength and poly propylene fibres are added to improve its ductility. The content of silica fume and GGBS is 5% and 25% respectively by weight of cement. Water to cementitious material ratio is 0.31. Mixes with different percentages of poly propylene fibres such as 0.5%, 0.1%, and 1.5% by the weight of cementitious content are denoted as HSFRC 1, HSFRC 2, and HSFRC 3, respectively. To improve the workability characteristics of the low water-binder ratio HSC mix, the Poly Carboxylate Ethylene-based chemical admixtures are used. The fresh properties were investigated in terms of slump flow and mechanical performances of the HSFRC over HSC are evaluated in terms of compressive, flexural, split tensile strength.