The Research Of The Temperature Shock Effect On The Airport Roads' Surface

In winter, the ice surface of concrete road must be fast deicing so that it can timely restoration of traffic. High temperature rapid deicing is the most efficient and effective way. However, the high temperature impact can easily lead to damage of the freezing concrete. Aiming at the airport pavement surface temperature impact of this class of problems, analysis of the different characteristics of airport pavement by temperature and thermal shock problems, from the external environment of the two aspects influencing field path effect of surface temperature shock and internal environment on the field road surface were deep level analysis. To further the establishment of the factors affecting the temperature impact surface of the problem is the shock temperature, water and chemical component of concrete.To grasp the impact of high temperatures on the concrete pavement damage law,the subject based on the vapor pressure combined effects of thermal stress theory, by Fourier conduction equations of ordinary concrete road surface temperature field distribution model; on the basis of the elastic theory, constructs the concrete thermal shock spring damage model. Under the laboratory condition of saturated frozen specimens(A group) and water saturated specimens(B group) for 50 /min high temperature thermal shock test. Obtained under the different thermal shock times the surface state, mass loss and specimen strength parametersExperimental results show that with the increasing number of shocks, the surface color of concrete specimens gradually becomes deeper, increase the amount of surface cracks widened, Group A specimen under the impact of the first crack width is four times as much as the group B of the specimen obviously dregs after 15 shocks;Aspects of quality loss, group B increased in accordance with the steady rate of mass loss, A group stepped into the mass loss increased; strength attenuation areas, A group of intensity decay and the decay rate is twice the amount of group B faster. The main cause of concrete damage at a temperature shock is that the high temperature inside the concrete changes in temperature, humidity, and chemical composition. High temperature inside concrete form completely saturated layer, fully saturated layer is the concrete high-temperature area and normal temperature area, boundary layer dry and humid areas. The concrete at upper layer of saturated layer is dry and high-temperature. Aggregate interface with the occurrence of heat stress and ettringite decomposition is the most vulnerable part of the interface. The vapour condensing in the large pores saturated layers forms a large vapor pressure and further exacerbates the concrete failure.