Abstract
The presence of ice and snow on a road surface in winter will reduce the traffic capacity of the road network, which can easily lead to traffic accidents. In this study, nonchlorine organic snow‐melting salt was added to emulsified asphalt to prepare an anticoagulant ice fog seal. Considering the destructive effect of snow‐melting salt on the stability of emulsified asphalt, polyvinyl alcohol was used as an encapsulation material to form a stable two‐phase system by mixing snow‐melting salt with emulsified asphalt. The zeta potential method was used to test the storage stability of the encapsulated salt solution. The results showed that the material and content of the encapsulation had a significant effect on the stability of the emulsified asphalt and the reduction in the freezing point of the encapsulated salt solution. PVA (1.5%) mixed with 24% sodium acetate was used to prepare an encapsulated salt emulsion, which was mixed with anionic emulsified asphalt and sprayed on the road surface. This significantly reduced the freezing point of road surface water. The recommended spraying dosage of the anticoagulant ice fog seal layer was 0.4 kg/m2, which could lower the freezing point by at least −8°C while simultaneously meeting the antislip performance condition. This was shown to be a preventive maintenance technology with both anticoagulant ice and maintenance effects.
Highlights
IntroductionAt the beginning or end of winter, any snow on the road gradually melts under the action of the traffic load, which can form a thin layer of ice when the temperature is below freezing. e presence of ice and snow on a road surface will reduce the traffic capacity of the road network, and cars will be prone to skidding, which is detrimental to the driving dynamics and safety of vehicles [1]. e current methods for removing ice and snow from roads can be divided into two categories: external technology (passive snow removal) and internal technology (active snow removal) [2]. e methods included in the external technology category mainly involve spraying snow-melting agents and manual and mechanical removal. ose included in the internal technology category mainly include geothermal and solar thermal ice-melting technology and physical and chemical ice and snow suppression technology [3]
With the increase of spraying amount, the bond strength at each temperature decreased, and the bond strength was even zero at high temperature. is is because the anticondensable ice fog seal can reduce the freezing point of the pavement so that it does not freeze or reduce the degree of freezing at lower temperature
When the temperature was higher than −12°C, the bond strength was about 0∼0.2 MPa and test results of Meng’s research were 0.11∼0.32 MPa [34], which was close to the results obtained in this paper, but the literature did not specify the test temperature. e test results show that a pull-out tester could be used to quantitatively characterize the anti-ice-condensation effect of the fog seal layer
Summary
At the beginning or end of winter, any snow on the road gradually melts under the action of the traffic load, which can form a thin layer of ice when the temperature is below freezing. e presence of ice and snow on a road surface will reduce the traffic capacity of the road network, and cars will be prone to skidding, which is detrimental to the driving dynamics and safety of vehicles [1]. e current methods for removing ice and snow from roads can be divided into two categories: external technology (passive snow removal) and internal technology (active snow removal) [2]. e methods included in the external technology category mainly involve spraying snow-melting agents and manual and mechanical removal. ose included in the internal technology category mainly include geothermal and solar thermal ice-melting technology and physical and chemical ice and snow suppression technology [3]. The salt is prepared as an emulsion to be sprayed on the road surface and is often used for short-term salt storage. The adsorption of a snow-melting salt in the prefabricated porous structure of a road or bridge deck can perform the functions of short-term salt storage, snow-melting, and ice suppression [22]. Using the ζ electric potential test method, suitable polymer materials were selected for the interface film to wrap the snow-melting salt and form a microencapsulated structure [30]. E emulsified asphalt in the anti-icing fog seal layer slowly released the nonchlorinated snow-melting salt after demulsification. When extreme icy and snowy weather occurs, it can achieve good deicing and snow removal effects when combined with other external technologies
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