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

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

Pdf Summary

The document discusses the development and testing of Self-Consolidating Concrete (SCC) and Steel Fiber-Reinforced Self-Consolidating Concrete (SFRSCC), emphasizing their attributes and testing procedures. SCC is recognized for its high flowability, negating the need for mechanical consolidation, thus reducing labor costs and demonstrating economical advantages. Incorporating steel fibers, the SFRSCC exhibits enhanced flexural and tensile strength, ductility, and resistance to crack propagation, while reducing shrinkage and creep.<br /><br />Current challenges in the design of SFRSCC include decreased workability with higher fiber content, fiber balling, lack of standardized proportioning methods, and insufficient understanding of the impact of fiber geometry. The research aims to address these through experimental mix series, assessing variations in fiber volume, paste, fine aggregate, and admixture content. The experiment included 11 mixes across three series to measure fresh and hardened properties.<br /><br />Series A analyzed the effect of increasing fiber content while keeping other proportions constant, revealing it does not effectively improve workability. Series B investigated the "excess paste design," which improves workability and slightly enhances strength, proving more advantageous than adjusting aggregate and admixture content alone. Series C evaluated the benefits of increased fine aggregate and admixture content, noting strength improvements but reduced workability.<br /><br />Various tests, such as the Slump-Flow and J-ring tests, along with stability and strength assessments, were utilized to evaluate the concrete's performance. The research highlights that recognizing the ratio of excess paste to aggregate content, and adjusting mix design for diverse materials can enhance SFRSCC properties. The study provides insights into advancing the economical and efficient use of SFRSCC in construction.

Keywords

Self-Consolidating Concrete

Steel Fiber-Reinforced Concrete

flowability

mechanical consolidation

fiber balling

workability

excess paste design

Slump-Flow test

J-ring test

mix design