Fiber-Reinforced Concrete—From Fresh Properties to Structural Design: New Tools, Guides, and Reports-Recent Advances in Durability An Overview of the Document ACI 544.5R-10 and Updates (PDF)

Recent Advances in Durability An Overview of the Document ACI 544.5R-10 and Updates (PDF)

Pdf Summary

The document "Recent Advances in Durability: an Overview of the Document ACI 544.5R and Updates" by Corina-Maria Aldea outlines the benefits and applications of fiber-reinforced concrete (FRC) in enhancing durability and physical properties such as creep, shrinkage, permeability, and electrical properties. The document starts by detailing the introduction and scope, where fibers in concrete are recognized for improving both pre- and post-cracking behavior. Various fiber types, including polymeric, steel, and glass fibers, are discussed.<br /><br />The guide covers key physical properties and factors like creep, where synthetic FRC has twice the creep coefficient compared to steel FRC. Shrinkage is mitigated with different fibers to reduce cracking potential. The permeability section highlights that fiber reinforcement significantly enhances resistance to permeation, especially when combining micro- and macrofibers. FRC also shows significant benefits in reducing permeability through controlled crack widths.<br /><br />Updates on permeability emphasize the comparative benefits of fiber over rebar in reducing water permeability. The discussion extends to rheology updates, which are crucial for ensuring proper fiber dispersion and enhancing mechanical performance of FRC. Electrical properties are noted for potential in non-destructive testing and monitoring via impedance spectroscopy.<br /><br />The chapter on durability focuses on environmental stressors like extreme temperatures, freezing and thawing, alkali attacks, and corrosion resistance. FRC exhibits improved durability against these challenges with specific fiber incorporation techniques. The document also addresses degradation issues due to alkali attack and methods to enhance long-term performance, particularly with glass and natural fibers. <br /><br />In summary, ACI 544.5R provides concrete professionals a comprehensive overview of using fibers to tailor new, sustainable concrete mixes aimed at improved durability and performance across various environmental and mechanical conditions.

Keywords

fiber-reinforced concrete

durability

creep

shrinkage

permeability

electrical properties

rheology

environmental stressors

alkali attack

sustainable concrete