Test method and material design of asphalt mixture with the function of photocatalytic decomposition of automobile exhaust

Wengang Zhang, Y. X. Zhang, Zhirong Jia, Fang Wang, Longting Ding

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

In this paper, by designing the UV irradiance, the compositions and the initial concentrations of automobile exhaust, an asphalt mixture test system – photocatalytic decomposition of automobile exhaust performance (AMTS-PDEP)was developed based on the photocatalytic mechanism of titanium dioxide (TiO 2 ). Testing method and calibration method of test data were also proposed in this paper. Accumulative decomposition ratio (ADr)was used as the evaluation indicator of photocatalytic decomposition of automobile exhaust performance (PDEP)and the influencing factors of PDEP were proposed. Based on the mechanical behavior and PDEP, the design method of asphalt mixture material composition was developed and the attenuation law of PDEP was also demonstrated. The results show that the PDEP of anatase TiO 2 is much better than Rutile TiO 2 . The PDEP of asphalt mixture with 0.3 μm TiO 2 is better than other particle sizes. Affected by particle adhesion, the PDEP of asphalt mixtures with 3.5% content of TiO 2 reaches the maximum value. The PDEP has positive correlations with volume (VV)of asphalt mixtures, irradiance and temperature. It is recommended that anatase TiO 2 (0.3 μm)is used as the photocatalyst, the optimum TiO 2 content is 3.1%, TPS modified bitumen is used as the binder, and porous asphalt concrete with a nominal maximum aggregate size of 13 mm (PAC-13)is used as the optimal structural carrier. The PDEP of asphalt mixture decreased with the increase of test times, but it returns to its original level immediately after simply rinse, and repeated rinse does not reduce the PDEP. The PDEP of asphalt mixture decreases with the increase of the pollution index or the decrease of VV caused by compacting.
Original languageEnglish
Pages (from-to)298-309
Number of pages12
JournalConstruction and Building Materials
Volume215
DOIs
Publication statusPublished - 2019

Keywords

  • asphalt
  • automobiles
  • exhaust gas
  • motors
  • photocatalysis
  • titanium dioxide

Fingerprint

Dive into the research topics of 'Test method and material design of asphalt mixture with the function of photocatalytic decomposition of automobile exhaust'. Together they form a unique fingerprint.

Cite this