Influence of sulfates on chloride diffusion and chloride-induced reinforcement corrosion in limestone cement materials at low temperature

0475258 - ÚTAM 2018 RIV US eng J - Journal Article
Sotiriadis, Konstantinos - Rakanta, E. - Mitzithra, M. E. - Batis, G. - Tsivilis, S.
Influence of sulfates on chloride diffusion and chloride-induced reinforcement corrosion in limestone cement materials at low temperature.
Journal of Materials in Civil Engineering. Roč. 29, č. 8 (2017), č. článku 04017060. ISSN 0899-1561. E-ISSN 1943-5533
R&D Projects: GA MŠMT(CZ) LO1219
Keywords : limestone cement * chloride diffusion * reinforcement corrosion * sulfate attack * low temperature
OECD category: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics
Impact factor: 1.763, year: 2017
Method of publishing: Limited access
https://doi.org/10.1061/(ASCE)MT.1943-5533.0001895

An ordinary portland cement and two portland limestone cements [15 and 35% weight-to-weight ratio (w/w) limestone content] were used for concrete and reinforced mortar specimens preparation. The specimens were exposed to two corrosive solutions (chloride sulfate and chloride) at 5°C. Total (acid-soluble) and free (water-soluble) chloride contents, and apparent chloride diffusion coefficients, were determined in concrete specimens. Reinforcement corrosion half-potential and current density, mass loss of steel rebars, and carbonation depth were measured in mortar specimens. Limestone cements showed very good behavior, although the environments were very corrosive.Total and free chloride ions concentration increased with exposure time and limestone content. Limestone cements showed less capability of binding chlorides than pure portland cement. The cement with low limestone content was the most effective in preventing reinforcement corrosion during mortar exposure to the combined chloride-sulfate solution, although it allowed the most intensive corrosion in the case of the chloride-bearing solution. The presence of sulfates led to higher chloride ion concentrations, less chloride binding and, generally, higher values of chloride diffusion coefficient, and also promoted reinforcement corrosion to a greater extent. Low temperature conditions retained a relatively low corrosion rate.
Permanent Link: http://hdl.handle.net/11104/0272107