Exposed aggregate areas and photocatalytic efficiency of photocatalytic aggregate mortar

Li Zheng (Lead / Corresponding author), Roderick Jones, Lu Yang, Amer Hakki, Donald E. Macphee

Research output: Contribution to journalArticle

9 Downloads (Pure)

Abstract

By having the potential to remove nitrogen oxide (NOx) air pollutants generated by vehicles and other anthropogenic combustion processes, particularly in urban areas, photocatalytic concrete has attracted significant commercial interests all over the world. In contrast to typical photocatalyst applications in concrete, in which titanium dioxide (TiO2) – the most utilised photocatalyst – is dispersed within the cementitious materials, the study reported here utilises titanium dioxide-coated aggregates. Used in an exposed-aggregate finish, this format aims to have a higher photocatalytic efficiency than titanium dioxide cement-bound materials. An exposed titanium dioxide-coated aggregate has the potential to provide a significantly higher proportion of catalyst to direct ultraviolet radiation and minimise lost performance due to occlusion. The exposed-aggregate surface area on the test mortar samples was measured with three-dimensional imaging techniques. Thereafter, photocatalytic efficiency was measured in comparison with that of the titanium dioxide cement mortar. The relationship between exposed area for photocatalytic reaction and photocatalytic efficiency was established. This indicated that the photonic efficiency increases with increasing exposed area, regardless of the method to support the catalyst – that is, either within the cement paste or externally mounted on the aggregate. The data confirm that exposing coated aggregate significantly enhances photonic efficiency.
Original languageEnglish
Number of pages12
JournalMagazine of Concrete Research
Early online date22 Feb 2019
DOIs
Publication statusE-pub ahead of print - 22 Feb 2019

Fingerprint

Mortar
Titanium dioxide
Cements
Photocatalysts
Photonics
Concretes
Air Pollutants
Catalysts
Nitrogen oxides
Ointments
Catalyst supports
Ultraviolet radiation
Nitric Oxide
titanium dioxide
Imaging techniques
Air

Keywords

  • aggregates mortal testing
  • apparatus & methods

Cite this

@article{57e36ff9d396433e868d6f330740cad3,
title = "Exposed aggregate areas and photocatalytic efficiency of photocatalytic aggregate mortar",
abstract = "By having the potential to remove nitrogen oxide (NOx) air pollutants generated by vehicles and other anthropogenic combustion processes, particularly in urban areas, photocatalytic concrete has attracted significant commercial interests all over the world. In contrast to typical photocatalyst applications in concrete, in which titanium dioxide (TiO2) – the most utilised photocatalyst – is dispersed within the cementitious materials, the study reported here utilises titanium dioxide-coated aggregates. Used in an exposed-aggregate finish, this format aims to have a higher photocatalytic efficiency than titanium dioxide cement-bound materials. An exposed titanium dioxide-coated aggregate has the potential to provide a significantly higher proportion of catalyst to direct ultraviolet radiation and minimise lost performance due to occlusion. The exposed-aggregate surface area on the test mortar samples was measured with three-dimensional imaging techniques. Thereafter, photocatalytic efficiency was measured in comparison with that of the titanium dioxide cement mortar. The relationship between exposed area for photocatalytic reaction and photocatalytic efficiency was established. This indicated that the photonic efficiency increases with increasing exposed area, regardless of the method to support the catalyst – that is, either within the cement paste or externally mounted on the aggregate. The data confirm that exposing coated aggregate significantly enhances photonic efficiency.",
keywords = "aggregates mortal testing, apparatus & methods",
author = "Li Zheng and Roderick Jones and Lu Yang and Amer Hakki and Macphee, {Donald E.}",
year = "2019",
month = "2",
day = "22",
doi = "10.1680/jmacr.18.00441",
language = "English",
journal = "Magazine of Concrete Research",
issn = "0024-9831",
publisher = "Thomas Telford",

}

Exposed aggregate areas and photocatalytic efficiency of photocatalytic aggregate mortar. / Zheng, Li (Lead / Corresponding author); Jones, Roderick; Yang, Lu; Hakki, Amer; Macphee, Donald E. .

In: Magazine of Concrete Research, 22.02.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Exposed aggregate areas and photocatalytic efficiency of photocatalytic aggregate mortar

AU - Zheng, Li

AU - Jones, Roderick

AU - Yang, Lu

AU - Hakki, Amer

AU - Macphee, Donald E.

PY - 2019/2/22

Y1 - 2019/2/22

N2 - By having the potential to remove nitrogen oxide (NOx) air pollutants generated by vehicles and other anthropogenic combustion processes, particularly in urban areas, photocatalytic concrete has attracted significant commercial interests all over the world. In contrast to typical photocatalyst applications in concrete, in which titanium dioxide (TiO2) – the most utilised photocatalyst – is dispersed within the cementitious materials, the study reported here utilises titanium dioxide-coated aggregates. Used in an exposed-aggregate finish, this format aims to have a higher photocatalytic efficiency than titanium dioxide cement-bound materials. An exposed titanium dioxide-coated aggregate has the potential to provide a significantly higher proportion of catalyst to direct ultraviolet radiation and minimise lost performance due to occlusion. The exposed-aggregate surface area on the test mortar samples was measured with three-dimensional imaging techniques. Thereafter, photocatalytic efficiency was measured in comparison with that of the titanium dioxide cement mortar. The relationship between exposed area for photocatalytic reaction and photocatalytic efficiency was established. This indicated that the photonic efficiency increases with increasing exposed area, regardless of the method to support the catalyst – that is, either within the cement paste or externally mounted on the aggregate. The data confirm that exposing coated aggregate significantly enhances photonic efficiency.

AB - By having the potential to remove nitrogen oxide (NOx) air pollutants generated by vehicles and other anthropogenic combustion processes, particularly in urban areas, photocatalytic concrete has attracted significant commercial interests all over the world. In contrast to typical photocatalyst applications in concrete, in which titanium dioxide (TiO2) – the most utilised photocatalyst – is dispersed within the cementitious materials, the study reported here utilises titanium dioxide-coated aggregates. Used in an exposed-aggregate finish, this format aims to have a higher photocatalytic efficiency than titanium dioxide cement-bound materials. An exposed titanium dioxide-coated aggregate has the potential to provide a significantly higher proportion of catalyst to direct ultraviolet radiation and minimise lost performance due to occlusion. The exposed-aggregate surface area on the test mortar samples was measured with three-dimensional imaging techniques. Thereafter, photocatalytic efficiency was measured in comparison with that of the titanium dioxide cement mortar. The relationship between exposed area for photocatalytic reaction and photocatalytic efficiency was established. This indicated that the photonic efficiency increases with increasing exposed area, regardless of the method to support the catalyst – that is, either within the cement paste or externally mounted on the aggregate. The data confirm that exposing coated aggregate significantly enhances photonic efficiency.

KW - aggregates mortal testing

KW - apparatus & methods

U2 - 10.1680/jmacr.18.00441

DO - 10.1680/jmacr.18.00441

M3 - Article

JO - Magazine of Concrete Research

JF - Magazine of Concrete Research

SN - 0024-9831

ER -