Electrode Layout Optimization and Numerical Simulation of Cast Conductive Asphalt Concrete Steel Bridge Deck Pavement

Abstract

In order to obtain the optimal electrode layout and ice melting effect of cast conductive asphalt concrete steel bridge deck pavement, firstly, pouring conductive asphalt concrete was prepared; secondly, different electrode materials and layout methods were selected to test the heating rate of the specimen from start to 120 min, and the electrode materials and layout methods were optimized. Then, the finite element analysis software ANSYS was used to build the model for heating and ice melting simulation, and the indoor test was used to further verify the ice melting effect of the cast conductive asphalt coagulation with or without the insulation layer. Finally, the thermal-structural coupling analysis of cast conductive asphalt concrete steel bridge deck pavement was carried out using ANSYS finite element software. The results showed that the stainless steel electrode material had the best heating effect, and the electrode thickness in the range of 0.1~3 mm had no effect on the heating effect. The intermediate heating rate of the upper surface of the stainless steel sheet electrode cast conductive asphalt concrete in the left and right external electrodes was 8 ∘C/h, while the intermediate heating rate of the upper surface of the stainless steel mesh electrode cast conductive asphalt concrete was 12.9 ∘C/h. The layout of the left and right buried stainless steel metal mesh was able to effectively improve the snow melting efficiency; ANSYS finite element ice melting simulation was used to obtain the variation law of ice melting efficiency and a temperature field of cast conductive asphalt concrete. The indoor ice melting test showed that when melting the same thickness ice layer at 50 V voltage, it took 240 min with an insulation layer and 720 min without an insulation layer, which was three times that of the ice with an insulation layer, which further verifies the superiority of its ice melting effect. The most unfavorable load position of pavement under load and temperature field was determined. The maximum tensile stress and compressive stress of the pavement surface were transverse, and the maximum shear stress of the pavement bottom was transverse.

Study on Thixotropy of Mastic Asphalt Binder and Asphalt Mastic

“…η orig − η ss lg t ss − t orig (5) Firstly, the optimal constitutive equation of the thixotropic structure of mastic asphalt binder materials is obtained by fitting experimental data by using an extended exponential model to obtain initial shear viscosity η orig and steady shear viscosity η ss , and then the time t ss − t orig corresponding to the reduction of initial shear viscosity η orig to steady shear viscosity η ss is obtained from experimental data. The initial shear viscosity η orig is often considered as zero shear viscosity, so the corresponding time t orig is zero, so the time required for viscosity change can be considered as t ss , and the improved time thixotropic index analysis model can be modified to Equation (6). MTTI characterizes the thixotropy level of mastic asphalt binder under certain conditions.…”

“…Due to its long mixing time, it cannot be applied to large-scale production, making it difficult to popularize and apply. Relevant researchers began to study the methods of shortening the mixing time of mastic asphalt mixture to improve its production efficiency [6,7]. Due to the thixotropy of mastic asphalt mixture, the related research progress is slow.…”

“…corresponding to the reduction of initial shear viscosity orig η to steady shear viscosity ss η is obtained from experimental data. The initial shear viscosity orig η is often considered as zero shear viscosity, so the corresponding time orig t is zero, so the time required for viscosity change can be considered as ss t , and the improved time thixotropic index analysis model can be modified to Equation (6). MTTI characterizes the thixotropy level of mastic asphalt binder under certain conditions.…”