The Study Of Influence Of The New Basalt Fiber On Asphalt Mixture’s Pavement Performance

The highway construction with different grades in China developed very fast in recentyears, which formed a huge highway transportation network in a high rate of speed. Thishighway transportation provide convenience for people’s trip. However, at the same time,there also appeared a lot of problems, such as the early damage of road, perplexed the roadbuilders. The rutting is one of the main highway diseases. This thesis presents a goodexplanation on the reason of the rutting disease and the strategies to prevent this damage. Inaddition, this thesis put forward that we can use a new type of material—the basalt fiber—toimprove the high temperature performance of asphalt mixture.The study states that to improve the high temperature anti-rutting performance of asphaltmixture using fiber should though the following process:1. the oil absorption feature of fibercan fortify the viscosity of asphalt;2. fiber can fortify the tenacity of asphalt;3. the spacemesh structure of fiber formed in the mixture can be used as a bridge.The data derived from experiments and the relevant information show that this new typeof basalt fiber has a very high tensile strength and high oil absorption rate, which can play the"reinforced bridge" and the mixture of asphalt "glue" role. Based on the theory of “fiber canimprove the high temperature performance of mixture”, the basalt fiber can improve the hightemperature performance of mixture. Through indoor test to determine the influence of thenew basalt fiber on optimum dosage of the asphalt, the mixing technology and the optimumdosage of fiber. Through this test process to find out reasonable preparation technology offiber asphalt mixture. Through the analysis and comparison ofAC-16matrix asphalt mixture,adding0.3%new AC-16basalt fiber matrix asphalt mixture, AC-16modified asphaltmixture, adding0.4%average basalt fiber SMA-13substrate bitumen mixture, add0.4%new SMA-13basalt fiber matrix asphalt mixture, add0.4%average basalt fiber SMA-13modified asphalt mixture, add0.4%new SMA-13basalt fiber modified asphalt mixture ofroad performance, to validate how the new basalt fiber improve the performance of asphaltmixture. Using scanning electron microscopy (sem) technique to observe the internal structureof the new type of basalt fiber mixture which can reveal the mechanism of fiber improving asphalt mixture performance from nature; Using the experiments of penetration and softeningdegree to analyze the influence of different fiber mucilage on asphalt. Finally, according to theexperiment results of dynamic stability, shear strength and softening degree to analyze thedistinction and relationship between the performance influence of fiber on asphalt and asphaltmixture. In the last part of this thesis, the author evaluate different fibers according to theinfluence of fiber to improve the high temperature performance of asphalt mixture and thefiber’s own characteristics.The experiments show that this new type of basalt fiber can well improve the pavementperformance of asphalt mixture, especially the high temperature performance. The hightemperature of new modified basalt fiber and SBS modified asphalt mixture show as:modified asphalt is better than modified mixture when the temperature is low; while, when thetemperature is high, modified is better than modified asphalt. As for the improvement effectof the asphalt mixture, the new type of basalt fiber works better than the ordinary basalt.