Fiber-Reinforced Self-Consolidating Concrete - Development and Use-Effect of Fiber Characteristics on Fresh and Hardened Properties of Fiber-Reinforced SCC (PDF)

Effect of Fiber Characteristics on Fresh and Hardened Properties of Fiber-Reinforced SCC (PDF)

Pdf Summary

The document details research presented at the ACI Spring Convention in 2019, concentrating on the effects of fiber characteristics on the fresh and hardened properties of Fiber-Reinforced Self-Consolidating Concrete (FR-SCC). Several studies and projects related to this topic are discussed, with a specific focus on bridge repair and viaducts in Montreal, the Jarry-Querbes Underpass, and other structural applications.<br /><br />The researchers, including Kamal H. Khayat and Fodhil Kassimi, analyze the performance characteristics of FR-SCC, focusing on its workability, mechanical strength, surface settlement, drying shrinkage, and resistance to cracking. The FR-SCC mixture demonstrated good performance, making it suitable for repair applications. Notably, repair beams using FR-SCC showed better structural performance than monolithic beams made with conventional vibrated concrete.<br /><br />The document discusses the methodology for evaluating the passing ability and slump flow against fiber factor variations. It also describes tests with different fiber types such as synthetic, steel, and hybrid fibers, and their impacts on workability and mechanical strength, including resilience against shrinkage and cracking.<br /><br />The research suggests that the incorporation of steel fibers can reduce mid-span deflection, strain in concrete and steel reinforcement, and crack width. Strategies are proposed for cracking mitigation, featuring the use of expansive agents and shrinkage-reducing admixtures, which improve time-to-cracking and minimize crack width variations.<br /><br />Additionally, the document mentions upcoming conferences and seminars related to advanced materials and sustainable infrastructure, highlighting topics like rheology measurement, chemical admixtures, and durability of concrete.<br /><br />In summary, the document provides a comprehensive examination of FR-SCC properties and practical applications in structural repairs, underscoring the material's potential for enhancing concrete performance in construction and repair scenarios.

Keywords

Fiber-Reinforced Self-Consolidating Concrete

FR-SCC

fiber characteristics

bridge repair

mechanical strength

cracking resistance

steel fibers

shrinkage mitigation

structural applications

sustainable infrastructure