Pavement Performance Analysis Of Glass Fiber Reinforced Porous Asphalt Mixture

With the rapid development of contemporary economy,the people's demand for travel quality is getting higher and higher,so we need to highlight the concept of "environmental friendliness" in traffic construction.Through the development at home and abroad,it is found that porous asphalt pavement is popular both at home and abroad because of its good skid resistance and low noise.However,due to the large gap and long time erosion by rainwater,it is easy to cause loose spalling and other water damage.At present,the performance improvement of single modification method is limited,and the composite modification method has attracted wide attention.Therefore,this paper takes the fiber modified porous asphalt mixture as the research object.The influence of fibers on the pavement performance of porous asphalt mixture was studied by indirect tensile test,semi-circular bending tensile test and freeze-thaw splitting test.The pavement performance comparison provided reference for the further popularization and application of new materials.(1)Through drawing tests of glass fiber,basalt fiber and steel fiber with different asphalt mortars,the bond strength between fibers and asphalt is analyzed.It is found that glass fiber and high-viscous asphalt have good bond strength at high temperature.(2)The high-temperature stability of the two mixtures under different glass fiber content is analyzed by stability and flow value.The results show that the high-temperature stability of the base asphalt mixture and the high-viscous asphalt mixture is the best when 0.2% glass fiber is added.At this time,the stability of the base asphalt mixture and the high-viscous asphalt mixture increases by 13.6% and 14.5%,respectively.(3)Indirect tensile test was used to evaluate low temperature performance,semi-circular bending test was used to evaluate medium temperature performance and freeze-thaw splitting test was used to evaluate water stability.It is found that 0.2% glass fiber is the best additive in the base asphalt mixture,and 0.4% glass fiber is the best additive in the high viscous asphalt mixture.In summary,the pavement performance of porous high-viscous modified asphalt mixture with 0.4% glass fiber is the best.