Title:
Accelerating CO2 Uptake in Cement Pastes through Nano-TiO2 Modification
Author(s):
Marina Lopez-Arias
Publication:
Web Session
Volume:
ws_S24_LopezGarcia.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
3/24/2024
Abstract:
Our study explores the effect of the nanomodification of cement pastes on CO2 uptake rate. Samples of 0.5 w/b were exposed to three initial CO2 concentrations during eight 1-hour cycles. Results showed that nano-TiO2 addition enhances the CO2 uptake rate of cement pastes, enabling the capture of more CO2 with lower CO2 concentrations, increasing efficiency. Also, the use of nanoparticles reduces porosity, which should decrease the diffusion of CO2, implying a lower carbonation rate. However, data revealed that nanomodified samples absorb CO2 faster while the porosity is decreased. 3D X-ray tests suggest that the nanomodification increases the pore surface area while reducing the overall porosity.