Experimental Study On Anti-condensation Performance Of Nano-ZnO Superhydrophobic Coating Pavement

During winter in China,the traffic capacity of roads declines easily due to the ice and snow climate.Especially in low temperature and humid environment,water and water vapor on the surface of pavement is easy to condense a thin layer of ice,which is a common natural disaster – condensation.With the characteristics of strong stickiness,high strength,fast growth and difficult elimination,condensed ice is one of the main problems affecting the safety of road systems.The condensed ice disaster will decrease the friction coefficient of road surface,resulting in vehicle slip during the driving process.And vehicle will rollover in the bend when it can’t overcome the centrifugal force.Ice condensation has very adverse impact on the vehicle travel,so the study of road anti-condensation performance is of great engineering value.Based on the study results of super-hydrophobic materials in spacecraft and transmission lines,this paper introduces super-hydrophobic materials into pavement coatings,providing a method for anti-condensation of pavement.Based on the theory of super-hydrophobic materials,research on the anti-water and de-ice performance of pavement coating with nano-ZnO superhydrophobic material is carried out in the present paper through experiment and theoretical analysis.The main research results of this paper are as follows:1)Based on the preparation method of superhydrophobic materials,the nano-ZnO superhydrophobic materials were prepared by the widely used sol-gel method,and the surface microstructure,chemical composition,wetting properties and anti-sliding performance were tested,validating that the surface of nano-ZnO superhydrophobic is constructed of nano scabrasity.2)The ice-coating behavior observation scheme was designed to observe the surface morphology of superhydrophobic specimens and ordinary concrete specimens under different conditions.The ice-forming rate and quality of the surface were tested.The ice-forming characteristics of superhydrophobic coating surface water were studied experimentally.The results show that the superhydrophobic coating has good delayed icing performance in low temperature environment,and the surface ice coating weight is significantly less than that of ordinary concrete specimens.3)The ice bonding strength of nano-ZnO superhydrophobic coatings was tested by splitting test and MTS universal capacity test machine in order to study the anti-icing performance of nano-zinc oxide superhydrophobic coatings.The test results show that nano-zinc oxide superhydrophobic coatings have lower ice bonding strength and can significantly improve the adhesion of ice on the road surface.4)The influence of superhydrophobic coatings on the difficulty of deicing and deicing effect was studied by comparing the residual rate of ice layer on pavement surface after deicing and the change of bonding force of superhydrophobic coatings in cyclic ice-coating drawing test.The results show that the coating will be destroyed by repeated deicing and the bonding force between ice roads will increase.