Performance evaluation of solar-responsive asphalt mixture with thermochromic materials and nano-TiO2 scatterers

In order to address water damage of asphalt pavement, reduce the occurrence of water-related potholes, deformation, and other diseases, and improve the performance and service life of the pavement, a nano-TiO2 superhydrophobic coating (PSC) on asphalt pavement was prepared from waterborne polyurethane and nano-TiO2 modified by stearic acid. FT-IR measured stearic acid successfully modified low surface energy substance on the surface of nano-TiO2. The SEM image shows that the PSC has a rough surface structure. The contact angle and rolling angle of the PSC in the contact angle test are 153.5° and 4.7°, respectively. PSC has a super-hydrophobic ability, which can improve the water stability of the asphalt mixture. Although the texture depth and pendulum value have been reduced by 2.5% and 4.4%, respectively, they all comply with the standard requirements. After the abrasion resistance test, the PSC coating still has a certain hydrophobic ability. These results surface PSC coating can effectively reduce water damage on asphalt pavement, and has considerable application value.

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Performance Evaluation and Lubrication Mechanism of Water-Based Nanolubricants Containing Nano-TiO2 in Hot Steel Rolling

Lubricants ◽

10.3390/lubricants6030057 ◽

2018 ◽

Vol 6 (3) ◽

pp. 57 ◽

Cited By ~ 9

Author(s):

Hui Wu ◽

Jingwei Zhao ◽

Liang Luo ◽

Shuiquan Huang ◽

Lianzhou Wang ◽

...

Keyword(s):

Performance Evaluation ◽

Lubrication Mechanism ◽

Nano Tio2 ◽

Steel Rolling ◽

Water Based

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Preparation Technique and Properties of Nano-TiO2 Photocatalytic Coatings for Asphalt Pavement

Applied Sciences ◽

10.3390/app8112049 ◽

2018 ◽

Vol 8 (11) ◽

pp. 2049 ◽

Cited By ~ 7

Author(s):

Hui Wang ◽

Ke Jin ◽

Xinyu Dong ◽

Shihao Zhan ◽

Chenghu Liu

Keyword(s):

Water Permeability ◽

Degradation Rate ◽

Asphalt Pavement ◽

Asphalt Mixture ◽

Exhaust Gas ◽

Preparation Technique ◽

Tio2 Content ◽

Nano Tio2 ◽

Evaluation Indexes ◽

Technical Requirements

According to the characteristics of asphalt pavement, a kind of nano-TiO2 photocatalytic coating was prepared by using the emulsified asphalt as the carrier. All of its properties met the technical requirements. An exhaust gas degradation test device and its test steps were developed. The evaluation indexes, cumulative degradation rate, and degradation efficiency, were put forward. From the two aspects of the nano-TiO2 content in photocatalytic coatings and the spraying amount of photocatalytic coatings in the surface of slabs (300 mm × 300 mm), the exhaust gas degradation effects, the performances of skid resistance, and the water permeability of asphalt mixture were analyzed. The test results showed that the cumulative degradation rate of exhaust gas was better when nano-TiO2 content was increased in the range of 0–8% and the spraying amount was changed in the range of 0–333.3 g/m2. In practical engineering applications, the anti-skid performance of asphalt pavement can be satisfied when the spraying amount of photocatalytic coating was limited to under 550 g/m2. The spraying amount of nano-TiO2 photocatalytic coating had little effect on the water permeability of the asphalt mixture. Therefore, 8% nano-TiO2 content in the coating and a 400 g/m2 spraying amount were finally recommended based on the photocatalytic properties, as well as for economic reasons.

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