Hybrid fibers and the development of cracking in concrete

J. S. Lawler, D. Zampini, S. P. Shah

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

Cracking in concrete is fundamentally altered by the addition of reinforcing fibers. A combination of microfibers (less than 22 j.tm [0.0009 in.] in diameter) and macrofibers (500 j.tm [0.0197 in.] in diameter) that contribute in complementary ways to performance, is presented as a means for controlling cracking and improving the lifecycle behavior of concrete. In previous work, a hybrid blend of these fibers in a mortar matrix demonstrated better mechanical performance and lower cracked permeability than was seen with a single fiber type. The research presented in this paper attempts to realize the potential of such blends in concrete. A mixture proportioning method that achieves good workability and cohesion in concretes containing microfibers was used to produce a cast concrete. The mechanical performance and shrinkage cracking resistance of this material were evaluated. In the hybrid reinforced concrete, the microfibers delayed the development of macrocracks and so the composite demonstrated greater strength and cracking resistance than a similar matrix reinforced with macrofibers only. However, this influence was less pronounced than was observed with a mortar matrix and was confined to smaller crack openings.

Original languageEnglish (US)
Title of host publication5th International Conference on Innovation in Design with Emphasis on Seismic, Wind, and Environmental Loading, Quality Control, and Innovations in Materials/ Hot-Weather Concreting
EditorsV.M. Malhotra
PublisherAmerican Concrete Institute
Pages791-809
Number of pages19
ISBN (Electronic)9780870310898
StatePublished - Sep 26 2002
EventACI 5th International Conference on Innovation in Design with Emphasis on Seismic, Wind, and Environmental Loading, Quality Control, and Innovations in Materials/ Hot-Weather Concreting - Cancun, Mexico
Duration: Dec 10 2002Dec 13 2002

Publication series

NameAmerican Concrete Institute, ACI Special Publication
VolumeSP-209
ISSN (Print)0193-2527

Conference

ConferenceACI 5th International Conference on Innovation in Design with Emphasis on Seismic, Wind, and Environmental Loading, Quality Control, and Innovations in Materials/ Hot-Weather Concreting
Country/TerritoryMexico
CityCancun
Period12/10/0212/13/02

Keywords

  • Concrete
  • Fiber-reinforcement
  • Fracture process
  • Hybrid
  • Microfibers
  • Shrinkage
  • Workability

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Fingerprint

Dive into the research topics of 'Hybrid fibers and the development of cracking in concrete'. Together they form a unique fingerprint.

Cite this