Chloride-related phenomena in limestone cement materials: effect of mineral admixtures and sulfates

0505716 - ÚTAM 2020 RIV US eng J - Journal Article
Sotiriadis, Konstantinos - Rakanta, E. - Mitzithra, M. E. - Batis, G. - Tsivilis, S.
Chloride-related phenomena in limestone cement materials: effect of mineral admixtures and sulfates.
ACI Materials Journal. Roč. 116, č. 6 (2019), s. 19-30. ISSN 0889-325X. E-ISSN 1944-737X
Institutional support: RVO:68378297
Keywords : chloride diffusion * low temperature * mineral admixtures * portland-limestone cement * reinforcement corrosion * sulfates
OECD category: Materials engineering
Impact factor: 1.483, year: 2019
Method of publishing: Limited access
https://www.concrete.org/publications/internationalconcreteabstractsportal.aspx?m=details&ID=51716820

The development of environmentally friendly cementitious materials, efficient in preventing chloride ingress and decreasing reinforcement corrosion risk, is significantly important for structural applications exposed to corrosive conditions. This paper investigates the effect of natural pozzolana, fly ash, blast-furnace slag, and metakaolin on the behavior of portland-limestone cement concretes and mortars during storage in chloride-sulfate and chloride solutions at 5°C (41°F). Acid- and water-soluble chloride contents, and apparent chloride diffusion coefficients, were determined in concretes. Reinforcement corrosion half-cell potential and current density, mass loss of steel reinforcing bars, and carbonation depth were monitored in mortars. The employment of mineral admixtures decreased chloride ingress and reinforcement corrosion during specimens’ exposure to chloride solution, however, the presence of sulfates in the corrosive environment prevented their improving effect. Mineral admixtures increased chloride binding and the resistance of concrete against chloride diffusion, while they also showed similar efficiency in preventing reinforcement corrosion. Sulfates facilitated chloride ingress, hindered chloride binding, and promoted reinforcement corrosion.
Permanent Link: http://hdl.handle.net/11104/0302959