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<p>This study examined the effects of simulated weathering conditions on the NO<sub><i>X</i></sub> and SO<sub><i>X</i></sub> removal rates of permeable concrete blocks with embedded porous materials. To provide NO<sub><i>X</i></sub> and SO<sub><i>X</i></sub> removal, titanium oxide (TiO<sub>2</sub>) nanoparticles or coconut shell carbon (CS) powders and zeolite beads (ZB) were embedded in permeable concrete blocks during their production. Permeable concrete blocks were produced with different embedding ratios of TiO<sub>2</sub> nanoparticles or CS powders using an actual factory production line of Company C in Korea. Leaching, freeze–thawing, and high and low temperatures were applied to each block to simulate weathering conditions. Test results reveal that the specimens with a 5% TiO<sub>2</sub> nanoparticle embedding ratio experienced reductions in NO<sub><i>X</i></sub> and SO<sub><i>X</i></sub> removal rates of approximately 17.7% and 19.5% respectively, after exposure to 10 leaching cycles and 300 freeze–thawing cycles, compared to unexposed specimens. However, the values were not affected by the high or low temperatures and remained similar to those of the unexposed specimens. In particular, the NO<sub><i>X</i></sub> and SO<sub><i>X</i></sub> removal rates of the specimens with a 5% CS powder embedding ratio exceeded 25.8% and 97.5%, respectively, and maintained similar values after exposure to leaching, freeze–thawing, and high- and low-temperature weathering conditions. Considering that TiO<sub>2</sub> nanoparticles can only be removed in an environment with ultraviolet light and NO<sub><i>X</i></sub> removal rates were reduced in water environments, such as leaching and freeze–thawing, CS powders and ZB are promising materials for the stable reduction of NO<sub><i>X</i></sub> and SO<sub><i>X</i></sub> even in external weathering conditions.</p>

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Effect of simulated weathering conditions on the NOX and SOX removal rates of permeable concrete blocks with porous materials

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Jae-Il Sim,
  • Ju-Hyun Mun,
  • Keun-Hyeok Yang,
  • Jong-Won Kim,
  • Yeon-Back Jung,
  • Se-Jin Choi,
  • Cong Thang Nguyen

摘要

This study examined the effects of simulated weathering conditions on the NOX and SOX removal rates of permeable concrete blocks with embedded porous materials. To provide NOX and SOX removal, titanium oxide (TiO2) nanoparticles or coconut shell carbon (CS) powders and zeolite beads (ZB) were embedded in permeable concrete blocks during their production. Permeable concrete blocks were produced with different embedding ratios of TiO2 nanoparticles or CS powders using an actual factory production line of Company C in Korea. Leaching, freeze–thawing, and high and low temperatures were applied to each block to simulate weathering conditions. Test results reveal that the specimens with a 5% TiO2 nanoparticle embedding ratio experienced reductions in NOX and SOX removal rates of approximately 17.7% and 19.5% respectively, after exposure to 10 leaching cycles and 300 freeze–thawing cycles, compared to unexposed specimens. However, the values were not affected by the high or low temperatures and remained similar to those of the unexposed specimens. In particular, the NOX and SOX removal rates of the specimens with a 5% CS powder embedding ratio exceeded 25.8% and 97.5%, respectively, and maintained similar values after exposure to leaching, freeze–thawing, and high- and low-temperature weathering conditions. Considering that TiO2 nanoparticles can only be removed in an environment with ultraviolet light and NOX removal rates were reduced in water environments, such as leaching and freeze–thawing, CS powders and ZB are promising materials for the stable reduction of NOX and SOX even in external weathering conditions.