Fiber-Reinforced Self-Consolidating Concrete - Development and Use-Design of Steel Fiber-Reinforced Self-Consolidating Concrete Based on the Fiber-Aggregate Skeleton Void Content (Recorded Presentation)

Design of Steel Fiber-Reinforced Self-Consolidating Concrete Based on the Fiber-Aggregate Skeleton Void Content (Recorded Presentation)

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Video Summary

The presentation by Joey Malloy from the University of Nebraska-Lincoln focused on the design of steel fiber reinforced self-consolidating concrete (SFR-SCC) and addressed issues like workability that decrease with higher fiber content. The study tested 11 mixes with varying fiber volume, paste, fine aggregate, and admixture content. Series A maintained constant proportions but resulted in poor workability. Series B adjusted paste content to improve flowability, while Series C increased fine aggregate and used a high-range water reducer, improving strength but reducing workability at higher fiber volumes. It highlighted the role of the fiber-aggregate skeleton's void content and excess paste in designing effective mix proportions. Challenges like fiber balling due to overmixing were noted, although glued steel fibers were used to help mitigate this issue. Overall, the research proposes enhancing both SFR-SCC workability and strength through careful proportion adjustments, suggesting further exploration of excess paste relative to total aggregate for improved design results.

Keywords

steel fiber reinforced concrete

self-consolidating concrete

workability

mix proportions

fiber balling

high-range water reducer