Performance of photo-catalytic paving blocks made from waste
- 1 November 2006
- journal article
- Published by Thomas Telford Ltd. in Proceedings of the Institution of Civil Engineers - Waste and Resource Management
- Vol. 159 (4), 165-171
- https://doi.org/10.1680/warm.2006.159.4.165
Abstract
Preliminary studies at The Hong Kong Polytechnic University showed that concrete paving blocks made from local waste materials (including construction/demolition waste and waste glass cullet) can be used to remove nitrous oxide (NO) when titanium dioxide (TiO2) was incorporated in the mix design. To determine the effectiveness of the photo-catalytic paving block when used in field conditions, a batch of factory-produced photo-catalytic paving blocks was produced and used in an actual site trial. The air quality of the field testing site was continuously monitored to analyse the effect of the blocks towards the surrounding air quality. The observations showed that nitrogen oxide (NO x ) concentrations were reduced by 13% at ground level and by 10% at the breathing zone. After a period of four months the blocks were removed from test site and taken back to the laboratory to analyse whether their ability to remove NO had been degraded. The results showed a decrease in performance of 23%, which is low compared with tests on similar products. Preliminary studies at The Hong Kong Polytechnic University showed that concrete paving blocks made from local waste materials (including construction/demolition waste and waste glass cullet) can be used to remove nitrous oxide (NO) when titanium dioxide (TiO2) was incorporated in the mix design. To determine the effectiveness of the photo-catalytic paving block when used in field conditions, a batch of factory-produced photo-catalytic paving blocks was produced and used in an actual site trial. The air quality of the field testing site was continuously monitored to analyse the effect of the blocks towards the surrounding air quality. The observations showed that nitrogen oxide (NO x ) concentrations were reduced by 13% at ground level and by 10% at the breathing zone. After a period of four months the blocks were removed from test site and taken back to the laboratory to analyse whether their ability to remove NO had been degraded. The results showed a decrease in performance of 23%, which is low compared with tests on similar products.Keywords
This publication has 7 references indexed in Scilit:
- NO removal efficiency of photocatalytic paving blocks prepared with recycled materialsConstruction and Building Materials, 2006
- The design and development of highly reactive titanium oxide photocatalysts operating under visible light irradiationJournal of Catalysis, 2003
- TiO2 photocatalytic oxidation of nitric oxide: transient behavior and reaction kineticsJournal of Photochemistry and Photobiology A: Chemistry, 2003
- Photocatalytic activity of semiconductor-modified cement—influence of semiconductor type and cement ageingApplied Catalysis B: Environment and Energy, 2002
- Rate of pozzolanic reaction of metakaolin in high-performance cement pastesCement and Concrete Research, 2001
- Titanium dioxide photocatalysisJournal of Photochemistry and Photobiology C: Photochemistry Reviews, 2000
- Effects of reduction of NOx on the NO2 levels in urban streetsScience of The Total Environment, 1996