Use of Fibers for Plastic Shrinkage Crack Reduction in Concrete

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Use of Fibers for Plastic Shrinkage Crack Reduction in Concrete

Author(s): P. Balaguru

Publication: Special Publication

Volume: 204

Issue:

Appears on pages(s): 171-194

Keywords: concrete; cracking; lightweight concrete; metallic fibers; mineral fibers; plastic shrinkage; polymeric fibers

Date: 8/1/2001

Abstract:
Use of discrete fibers to reduce plastic shrinkage cracking of concrete is discussed. The results presented cover a wide range of fibers in terms of their material properties such as modulus of elasticity, diameter, lengths, and surface characteristics. Fiber contents used ranges from 0.45 kg/m3 to 60 kg/m3 and the matrix composition evaluated vary from mortar to concrete with normal and low density aggregates. The influence of fiber properties, fiber geometries, volume fractions, and matrix compositions were evaluated for the crack reduction of concrete during the initial and final setting period. These cracks eventually influence the long-term durability of concrete. The results indicate that fibers provide a definite contribution to crack reduction and the major parameters that influence the crack reduction are: fiber count, geometry of the fiber, modulus of elasticity of the fiber, and fiber volume fraction. The fiber volume fraction needed for effective crack reduction ranges from 0.1 to 5 percent.