The Research on the Interface Performance of Deck of Cement Concrete Bridge and Asphalt Pavement

摘要

The deck of cement concrete bridge and the interface of asphalt pavement, and these two combined items have a direct effect on the useful life of asphalt pavement. According to the indoor shear test and pullout test, we could learn that the interlayer shear strength and the bond strength are strongly affected by temperature, and it is decreased with increasing test temperature. The pullout test analyses the variation regularity of bond strength between four adhesive layers and bridge panel at different temperatures, which proves that the bond strength is also decreased with increasing test temperature. The research suggests that the shear test and pullout test is worthy of evaluating the interface performance between deck and asphalt pavement under the high stability and low temperature conditions. The bond between the bridge structure and the flexible pavement layer is plays a vital role in deck of the bridge pavement. This layer is referred to bonding layer, and can also be used as a waterproofing layer. The study showed that the shear failure of waterproof and cohesive layer is the major type of destruction of the bridge deck pavement, and it is a specific type of destruction. The reason is that the horizon is lie in the between the rigid bridge plate with layer flexible asphalt pavement. The shear stress is tend to large, and it can produce shear sliding effect. Analyzing the disease between the deck of cement concrete bridge and the interface of asphalt pavement, it is concluded that the general waterproof adhesive layer is difficult to meet the need of pavement because the working conditions of waterproof adhesive layer is worse than the road. The reinforced concrete structure should not be affected by the alternation of moist and dry environment. If the reinforced concrete structure is infiltrated by the cold freezing water, it is likely to be destructed by expansion or to be corroded. Therefore, it is essential to construct the reliable waterproof adhesive layer that can prevent the rainfall to penetrate the reinforced concrete structure effectively. The adhesive layer between cement concrete bridge and asphalt pavement, which completely combine the surface of asphalt concrete with the bridge structure, and resist the vehicle generating horizontal thrust in the case of high speed and brake. Waterproof adhesive material should have a high strength, excellent in water resistance, elongation and cracking resistance. It also has good heat resistance and cold resistance, which in order to accommodate the temperature change. At the same time, good adhesion, shear resistance and fatigue resistance are also the performance of waterproof adhesive material. According to the indoor and outdoor tests, this paper studies the interface performance of cement concrete deck and asphalt pavement layer.