The Research On Interface Anti-shear Between Base And Surface Of The Asphalt Pavement

Pavement structure is constituted of subgrade (on top), cushion, base, and surface. It is the part which is most straight bear load and environment effects in road engineering. At now, our country asphalt pavement design standard adopt elastic multilayer theory to check design index, which assumed partial stress and displacement are completely continuous status under interlayer contact status, asphalt material calculation parameters adopt static parameter. But the actual situation in interlayer contact status are not so, when asphalt pavement have been build, adjoin pavement distress occurred, rain (snow) water invade pavement inner inevitability. Because of semi-rigid base is always impermeable, water can't through base scatter rapidly, detain on the base top surface, when it under the heavy vehicle loads repeated action, base is erosion damaged by hydrodynamic pressure, leading to soften, then formed mortar. This condition is completely different from the situation which the standard assumed. In order to keep the built road a fine operation effect, ensure road's service quality. This thesis purpose to study the surface during the base and surface course in asphalt pavement from theoretical and practical based on the study from overseas and domestic.The parameter of asphalt mixture is static modulus when applied the theory of elastic layered system to the analysis of asphalt pavement in our country. But, the deformation of the asphalt mixture has obvious viscosity under stress condition and temperature has great influence to it, furthermore, test conditions also can impact the parameter of asphalt mixture. In order to closer to actual experiences, in my research I analysis and summarize four methods to get dynamic modulus of asphalt mixture, so I can get dynamic modulus of asphalt mixture in some condition.Applied the theory of elastic layered system with program BISAR3.0 to calculate and analyze the stress and strain change in the pavement structure layer because of the change in the different interface state of interface of the base and the layer, furthermore, to calculate and analyze it working to the pavement performance.Because of the sensitive-temperature property of asphalt mixture, in my research I calculate the distribution of temperature along depth in the pavement structure under high temperature status, to get dynamic modulus of asphalt mixture under different temperature and different loading frequency. So, I can calculate the stress and strain and deflection of the pavement in the pavement structure under heavy load effect to the climbing roadway, further analyze the reason that why the pavement of the climbing roadway easy to damage.Reasonably selecting of pavement material and adhesive materials, using of rut instrument and portable shear apparatus, a test method of anti-shear strength between base and surface by laboratory experiments has been proposed. Simultaneously, the relationship between the construction technology of the bituminous pavement with semi rigid base course and anti-shear strength between base and surface has been considered. In the test, we can find out the shear resistance of interlayer base surface great affected by surface roughness.There is not a method of testing between base and surface layer status , is effective and feasible, current standard and specification in our country .To this point, the aim of this research is to put forward with a feasible way for outdoor detection and evaluation of shear resistance of interface layer. That is"gurus"grapheme. In order to conveniently realize the site detection for interface between base and surface anti-shear ability of pavement structure.