Role of cracks on strength, ductility and durability

S. P. Shah*, J. S. Lawler

*Corresponding author for this work

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

Abstract

Failure of concrete under load occurs in three phases: 1) distributed microcracking, 2) development of a macrocrack through the coalescence of microcracks and 3) macrocrack widening. This process governs the mechanical response of the material and has a strong impact on the durability of the concrete and the structure in which it is used. The strength of concrete, typically determined by the macrocrack development, can be increased by densifying the matrix through the use of low water-to-cement ratios and supplementary cementitious materials. However, this occurs at the expense of ductility, which is derived from energy-absorbing, distributed cracking. Conventional macrofibre reinforcement, with fibres greater than 0.5 mm in diameter, can slow the opening of macrocracks and impart post-peak ductility to the material. However, the presence of macrocracks provides avenues for the ingress of water and aggressive water-borne agents that can limit durability of concrete. Microfibre reinforcement, with fibre diameters less than 0.03 mm, slows the process by which microcracks evolve into macrocracks and so reduces permeability. To maximize the ductility and durability of concrete, crack development must be controlled. A hybrid blend of micro- and macrofibres is one method to achieve this control.

Original languageEnglish (US)
Title of host publicationRole of Cement Science in Sustainable Development - Proceedings of the International Symposium - Celebrating Concrete
Subtitle of host publicationPeople and Practice
PublisherThomas Telford Services Ltd
Pages1-12
Number of pages12
ISBN (Print)0727732463, 9780727732460
DOIs
StatePublished - 2003
EventRole of Cement Science in Sustainable Development - International Symposium Celebrating Concrete: People and Practice - Dundee, United Kingdom
Duration: Sep 3 2003Sep 4 2003

Publication series

NameRole of Cement Science in Sustainable Development - Proceedings of the International Symposium - Celebrating Concrete: People and Practice

Other

OtherRole of Cement Science in Sustainable Development - International Symposium Celebrating Concrete: People and Practice
CountryUnited Kingdom
CityDundee
Period9/3/039/4/03

Keywords

  • Cracking
  • Ductility
  • Durability
  • Fibre-reinforced concrete
  • Hybrid
  • Permeability

ASJC Scopus subject areas

  • Engineering(all)

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