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Abstract for presentation (Poster or Podium)

Sustainable Transportation & Urban Development

Time Impacts of NaHCO3 Pervious Concrete Treatment: An ITZ Analysis Through Nanoindentation Tests

Sunday, June 16, 2024
3:00 PM - 4:15 PM ET
Room: Galleria
Abstract:

Pervious concrete pavements tend to deteriorate due to chemical attacks from deicer salts. Because of that, several treatments aim to improve the material’s resistance to them. One of these treatments subjects pervious concrete to sodium bicarbonate solutions, to accelerate the material’s carbonation, and prevent cementitious components from reacting with chemicals in the deicers. This treatment was applied in a previous research project, which suggested that waiting 2 months after the treatment improved the concrete’s compressive strength. This current paper aims to verify if this strength boost is justified by these 2-month wait. For that, nanoindentation tests were performed on samples that used leftover material from that previous research project. Nanoindentation results showed a larger presence of calcium carbonate in specimens with higher compressive strength values and that were tested 2 months after the treatment, suggesting that the waiting is significant for the concrete’s strength boost and for its carbonation acceleration.

Learning Objectives:

Attendees can expect to learn the following from this session:
  • Demonstrate that the accelerated carbonation process of pervious concrete is more efficient if a 2-month waiting time is given after the material’s treatment with NaHCO3 solution.
  • Demonstrate that the carbonation process of pervious concrete also improves the material's mechanical performance.
  • Characterize pervious concrete specimens in their nanoscale, associating this characterization with the material’s macroscopical performance.
  • Conduct and support future research projects on pervious concrete, involving treatments with sodium bicarbonate, nanoscopic tests, and novel technologies, which would help intensifying the material’s application in multiple environments.