Study on Performance of Transition Layer Material with High Viscosity and Elasticity Asphalt on Bridge Deck Pavement
Aiming at the performance requirements of concrete bridge deck pavement engineering for pavement materials,the oil-rich high-viscosity and high-elasticity bridge deck pavement transition lay-er material was put forward.A high-viscosity and high-elasticity modified asphalt with dynamic vis-cosity of＞700,000 Pa·s at 60℃ was developed,and the service performance of transition layer ma-terials and composite structures with different asphalt-aggregate ratios,different gradations and dif-ferent thicknesses was studied.The results show that the oil-rich high viscosity and high elasticity transition layer material has excellent high temperature,low temperature and water stability.In the form of composite structure,the shear strength and pullout strength of concrete bridge deck at 25℃reach 0.98 MPa and 0.71 MPa respectively.Under dynamic load,with the increase of asphalt-aggre-gate ratio and thickness,the initial crack appears and the crack propagation speed decreases,which plays a role in preventing crack transmission and reflection.Under the stress level of 0.2,the fatigue life of the composite structure of paving layer can reach 100 million cycles.The ultra-thin combined pavement structure has excellent service performance,which can effectively prevent deck diseases such as shifting,packing and cracking of the pavement.
high asphalt content mixturehigh viscosity and elasticitybridge deck pavementtransi-tion layerperformance
万方数据
维普
