ANALYSIS OF THE INFLUENCE OF STEEL FIBER CONTENT RELATED TO EXCESS VOLUME OF ULTRA-HIGH-PERFORMANCE CONCRETE PAST

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Abstract
Ultra-High-Performance Concrete (UHPC) is known for its exceptional properties. The objective of this research was to analyze the influence of steel fiber content and paste volume on the properties of UHPC and to evaluate its performance in the fresh and hardened state. Tests were carried out with different steel fiber contents (0% to 5%) and paste volumes (20%, 40%, 60% and 80% excess paste), considering spreadability, workability and compressive strength. In the fresh state, it was observed that the addition of fibers reduced the spreadability, with a decrease between 6% and 21%. On the other hand, increasing the amount of excess paste improved the flowability and workability of the mixes. In the cured state, there was no statistically significant difference between the mixes with different paste contents. However, it was found that increasing the fiber content reduced the compressive strength of UHPC. Increasing the amount of excess paste did not have a significant effect on strength, but did improve the flowability and consistency of the mix when fresh. The research showed that the fiber content affects the workability and strength of the UHPC, while the paste volume favors the flowability without compromising the compressive strength in the hardened state.