Photocatalytic asphalt pavement: the physicochemical and rheological impact of TiO2 nano/microparticles and ZnO microparticles onto the bitumen

A cost-effective solution to provide asphalt pavements with the photocatalytic property was addressed for the first time, based on the combination of low percentages of two semiconductors, TiO₂ and ZnO. Two photocatalytic techniques – spray deposition and bitumen modification – were used. With the former, the chemical properties were evaluated by FTIR after spraying the bitumen samples with two aqueous solutions, one with acid PH and another alkaline, of nano-TiO₂. The solution with less chemical impact was the alkaline one. With the latter, Penetration, Softening Point, Mass Loss, Dynamic Viscosity, Complex moduli and Performance Grade, after the modification by TiO₂ nano/microparticles and ZnO microparticles, were analysed with two levels of ageing produced by the RTFOT. TiO₂ nano/microparticles and ZnO microparticles conducted to softer bitumens and better results of short-term ageing resistance and did not cause any deterioration to the bitumen before or after either short- or long-term ageing.

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    • © 2018 Informa UK Limited, trading as Taylor & Francis Group. Abstract reprinted with permission of Taylor & Francis.
  • Authors:
    • Segundo, Iran Gomes da Rocha
    • Dias, Elisa Alexandra Lages
    • Fernandes, Filipa Daniela Pereira
    • Freitas, Elisabete Fraga de
    • Costa, Manuel Filipe
    • Carneiro, Joaquim Oliveira
  • Publication Date: 2019-8

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  • English

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  • Accession Number: 01707865
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 5 2019 3:01PM