Response of Portland Limestone Cement Concrete to High Concentration of Chloride-Based Salts

General use limestone (GUL) cement is now permitted in the production of all classes of concrete in Canada. Its contribution to reduction in greenhouse gas emissions and sustainable construction is the main driving force for its development globally. However, there has been dearth of information on the effect of GUL on performance of concrete exposed to high concentration of chloride-based salts. Therefore, the aim of this study is to investigate the response, in terms of physico-mechanical properties and microstructural features, of concrete made with GUL without or with fly ash to highly concentrated chloride solutions (NaCl, MgCl2 and CaCl2). A continuous immersion exposure at 5°C was used to promote formation of complex salts (oxychlorides). The results revealed that GUL mixtures exhibited better resistance to de-icing salts due to synergistic physical and chemical actions of limestone in the cementitious matrix. The resistance of concrete exposed to de-icing salts is a function of physical penetrability (magnitude of intruding solution), amount of aluminate in cement and content of portlandite available for chemical reactions in the hydrated paste. The incorporation of high volume fly ash (30%) had a pronounced effect on improving the concrete resistance to damage as reflected by sound mechanical properties and longevity.

Language

  • English

Media Info

  • Media Type: Web
  • Pagination: 1 PDF file, 1.0 MB, 13p.
  • Monograph Title: Transportation Association of Canada 2020 Conference and Exhibition - The Journey to Safer Roads

Subject/Index Terms

Filing Info

  • Accession Number: 01759523
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada
  • Files: ITRD, TAC
  • Created Date: Dec 1 2020 1:58PM