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Preparation and Evaluation of Exhaust-Purifying Cement Concrete Employing Titanium Dioxide

1
School of Materials Science and Engineering, Chang’an University, Xi’an 710061, China
2
School of Construction Management Technology, Purdue University, West Lafayette, IN 47907, USA
3
Qinghai Academy of Transportation Sciences, Xining 810008, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(13), 2182; https://doi.org/10.3390/ma12132182
Received: 10 June 2019 / Revised: 2 July 2019 / Accepted: 4 July 2019 / Published: 7 July 2019
(This article belongs to the Special Issue Sustainable Designed Pavement Materials)
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Abstract

To address the increasing air pollution caused by vehicle exhaust, environment-friendly pavement materials that possesses exhaust-purifying properties were prepared using common cement concrete and porous cement concrete as the base of photocatalyst nano-titanium dioxide (TiO2), respectively. Firstly, Fe3+-doped TiO2 powder was prepared by applying planetary high-energy ball milling in order to improve the efficiency of the semiconductor photocatalyst for degrading vehicle exhausts. Two nano-TiO2, namely the original and modified nanomaterials, were adopted to produce the photocatalytic cement concretes subsequently. The physicochemical properties of the modified powder, as well as the mechanical and photocatalytic properties of TiO2-modified concrete, were characterized using a suite of complementary techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), compressive strength and degradation efficiency tests. The results show that the ball milling method not only successfully doped Fe3+ into catalysts but also caused significant changes in: (1) decreased particle sizes, (2) more amorphous morphology, (3) decreased percentage of the most thermodynamically stable crystal facet, and (4) increased percentage of other high gas sensing crystal facets. Both the original and modified nano-TiO2 can improve the concrete strength while the strengthening effect of modified nanomaterials is superior. It is pronounced that the photocatalytic property of the modified nano-TiO2 is much better than that of the original nano particles, and the degradation rate of porous concrete is also better than common concrete when exposed to the same photocatalyst content. In a comprehensive consideration of both mechanical performance and degradation efficiency, the recommended optimum dosage of TiO2 is 3% to 4% for exhaust-purifying concrete. View Full-Text
Keywords: photocatalytic pavement; vehicle exhaust; photocatalytic concrete; porous concrete; degradation efficiency photocatalytic pavement; vehicle exhaust; photocatalytic concrete; porous concrete; degradation efficiency
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He, R.; Huang, X.; Zhang, J.; Geng, Y.; Guo, H. Preparation and Evaluation of Exhaust-Purifying Cement Concrete Employing Titanium Dioxide. Materials 2019, 12, 2182.

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