Impact of Chemical Deicers-Saltwater Phase Diagrams to Better Describe Concrete Durability (Recorded presentation)

Saltwater Phase Diagrams to Better Describe Concrete Durability (Recorded presentation)

Video Transcription

Video Summary

The presentation explores premature concrete pavement failures, emphasizing the role of phase diagrams in understanding unexpected damage, particularly in cold regions using de-icers. Joint failures in concrete, often blamed on various factors like contractors and materials, are found to be exacerbated by water saturation and concentrated salt solutions. The presenter identifies two damage mechanisms: classic freeze-thaw influenced by low salt concentrations, and chemical reactions at higher salt concentrations. These reactions, notably with calcium oxychloride, can occur at moderate temperatures, exacerbating damage. Strategies to mitigate such degradation include using supplementary cementitious materials (SCMs), which reduce harmful chemical reactions, and applying sealers to existing pavements to prevent salt infiltration. By optimizing cement compositions and employing strategic materials, the durability of concrete structures can be enhanced, reducing long-term repair costs and improving performance in environments where de-icers are frequently used.

Keywords

concrete pavement failures

phase diagrams

freeze-thaw damage

calcium oxychloride

supplementary cementitious materials

salt infiltration prevention