Study Of Bonding Layer Stress Analysis And Bond Craft Of Continuously Reinforced Concrete Composite Pavement

For composite pavement with asphalt concrete(AC) upper layer and continuously reinforced concrete (CRC) under layer, shear strength between the two layers is a critical design criteria which affects the distresses of slip and corrugations because of relatively thin asphalt concrete upper layer and significant modulus differences of these two layers. To decrease the possibility of slip and disintegration, it is important to enhance the shear strength of bonding layer. General treatment is to set bonding layer, namely intermediate layer of CRC layer and AC layer which will reduce reflective crack, increase shear strength and hold up the movement of moisture. Adopting domestic and foreign study references and combining with Changsha-Xiangtan expressway Pavement rehabilitation project, this dissertation analyses AC+ CRC composite Pavement stress condition and bonding craft of the binding course. As for stress, the shear stress is the main part. Applying multiplayer elastic system program BISAR and wide-used finite element method software ANSYS to search stress and strain of binding course, ascertain the maximum horizontal shear. When using BISAR, we should analyse AC layer depth, material properties, AC layer surface friction coefficient ,bonging layer combination rate ,geofabric, etc. and research how they would affect shear stress response of binding course, then we should draw the nomograms of calculated results accordingly. When applying ANSYS, we should focus on width of continuously reinforced concrete under layer, binding course friction coefficient, dynamic property and so nonlinear factors. With regard to experiment, portable rock shear apparatus is adopted to test CC+AC examples intermediate layer shear strength where actual roads structure is emulated. Then the maximum bonding layer shear strength, cohesion (C ) and friction angle( φ) can be worked out. According to calculated results and experiment data, shear reliability coefficient analysis is deduced tentatively. What is more, bonding layer construction procedure, construction cautions and substantial building examples of this project are introduced briefly.