| LU Zhen-zhen,GE Qian-qian,CHEN Jian,LIANG Yang,WEI Peng.Analysis of Anticoagulant Ice Performance of Superhydrophobic Coating Asphalt Concrete Surface[J],51(7):324-333, 352 |
| Analysis of Anticoagulant Ice Performance of Superhydrophobic Coating Asphalt Concrete Surface |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.07.032 |
| KeyWord:superhydrophobic asphalt concrete SiO2 modified polysiloxane composite structure ice removal and suppression software simulation |
| Author | Institution |
| LU Zhen-zhen |
School of Civil Engineering Chongqing , China;National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing , China |
| GE Qian-qian |
School of Civil Engineering Chongqing , China |
| CHEN Jian |
School of Civil Engineering Chongqing , China |
| LIANG Yang |
Chongqing Municipal Facilities Administration, Chongqing , China |
| WEI Peng |
Chongqing Municipal Facilities Administration, Chongqing , China |
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| Abstract: |
| This study aims to understand the anti-icing performance of superhydrophobic coating applied to asphalt pavements and solve the problem of traffic accidents caused by road icing in northern China and high-altitude areas. With the hydrophobic nano-SiO2 powder and polyurethane modified polysiloxane as the main materials, transparent superhydrophobic SiO2/polysiloxane composite coating was prepared on the asphalt marshall specimen surface by the dip coating method. Then, this study made the analysis of the wear resistance, light transmittance, chemical stability and superhydrophobicity of the coating. Meanwhile, it simulated tests such as icing test, "drop weight" test, and anti-freezing test, which were used to evaluate the abrasion resistance, transparency, acid and alkali corrosion resistance, anti-icing performance, easy deicing performance and low-temperature frost resistance of the superhydrophobic coating and the surface morphology of the coating was analyzed by scanning electron microscope and optical microscope. The results showed that the SiO2 mass fraction is 7.5% and the light transmittance of the coating is 76.3%, the water contact angle of the composite coating could reach 160.9°±0.7°; even if the surface of the test piece was washed by rain for 5 hours, it could still maintain a certain degree of hydrophobicity; meanwhile, the complete superhydrophobic coating and the superhydrophobic coating with abrasion were applied to asphalt concrete pavement, the contact angle of the complete superhydrophobic coating was still greater than 150° after freezing for 1 h at low temperature (−20-0 ℃), and the coating with abrasion on the surface can also maintain a certain degree of hydrophobicity. In a −5 ℃ cryogenic tank, water drops were dropped at a constant rate on the surface of the tilted complete superhydrophobic asphalt concrete and the superhydrophobic asphalt concrete with abrasion. The surface of the complete superhydrophobic asphalt concrete was free of water droplets, and there was a small amount of icing on the surface of the superhydrophobic asphalt concrete with abrasion. The “drop weight” test was used to simulate the impact of the driving load on the ice layer on the surface of the test piece, and it was found that the ice layer on superhydrophobic asphalt pavement could be completely removed. In the Abaqus software simulation, the internal maximum tensile strain of the ice sheet under the action of vehicle load is 3.25×10−4 and the maximum shear strain is 4.25×10−4, both of which are larger than the ultimate tensile strain of the ice sheet (2.2×10−4) and the ultimate destructive shear strain (2.4×10−4). Nano SiO2 particles clump together on the surface of the coating to form a micronano rough structure, which makes the coating superhydrophobic. The superhydrophobicity of the coating can reduce the adhesion between water and the pavement to make water droplets roll off instantly when they land on the surface of superhydrophobic asphalt concrete coating, which can effectively reduce the amount of icing on the pavement and improve the ice suppression and deicing performance of the asphalt pavement. |
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