Performance of photo-catalytic paving blocks made from waste

Chi Sun Poon, E. Cheung

Research output: Journal article publicationJournal articleAcademic researchpeer-review


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.
Original languageEnglish
Pages (from-to)165-171
Number of pages7
JournalProceedings of the ICE-Waste and Resource Management
Issue number4
Publication statusPublished - 2006


  • Strength & testing of materials
  • Recycling & reuse of materials
  • Models (physical)

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Waste Management and Disposal


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