The Non-contact Method of Assessing the Quality of the Road Surface with the Rubber Crumb in the Construction Process

Abstract

Process of cooling of a paving of hot asphalt concrete mixes containing a rubber crumb at construction of highways is considered. The article presents the description of the mathematical model of calculation of temperature fields of pavement. One-dimensional unsteady heat conduction equations for each layer consist in a mathematical model. The boundary conditions on the surface of the top layer consider the heat transfer by convection and radiation. The boundary conditions of the fourth kind are between the layers. The temperature boundaries of the lower layer are constant. Testing the model is performed for limited and semi-infinite rods. The article presents the results of testing the mathematical model. Numerical solution of heat conduction equations held by the implicit scheme. Results of an experimental study of the thermal conductivity of asphalt concrete containing crumb rubber are listed in this article. In article the method of calculation of temperature of a surface of a paving is offered. The calculated values of temperature of a paving depending on the speed of a wind, solar radiation, thickness of a coat layer, a difference of thickness of a layer of hot asphalt concrete containing a rubber crumb, and reference temperature of a layer are presented. It is established that under identical conditions porosity of material of a layer has the greatest impact on change of temperature.