Road Performance And Corrosion Damage Of Mineral Composite Fiber Asphalt Mixture In Salt Enrichment Condition

With the development of national economy and the deepening implementation of theWestern Development Strategy, the traffic mileage of asphalt pavement continuouslyincreases in Western China. However, the structure design, material composition, paving andmaintenance technology of asphalt pavement under salt enrichment environment are facingenormous challenges which can be certified by the aggravation of early diseases with theerosion of salt substance in built asphalt pavement. At present, the incorporation of reinforcedfiber has become an effective mean to enhance the pavement performance of asphalt mixture.Therefore, the mineral composition fiber MiberⅠwas developed. However, reports onperformance variation law and corrosion damage of asphalt mixture under salt enrichmentenvironment are rare and the applicability of fiber asphalt mixture as well as the serviceperformance of the mineral composition fiber needs further discussion. Therefore, thein-depth, systematic study of these issues has a great theoretical value and engineeringsignificance to extend the service life of asphalt pavement in salt enrichment environment.On the basis of the evaluation of the technical performance of the mineral compositionfiber material, the requirements of fiber used in hot-mix asphalt mixture under saltenrichment environment were proposed. Rheological theory and experiment simulationmethod were used to study the effect of different factors such as fiber species, mixingamount, temperature and the frequency of loading action on the performance and therheological parameters (complex shear modulus, phase angle) variation law of fiber-asphaltglue. The viscoelastic behavior of fiber-asphalt glue was analyzed by modified Burgersmodel and the rheological parameters of the model were determined.Based on the climate and environment condition of salt enrichment regions, the shearbehavior and tensile property of fiber-asphalt motar under sulfate corrosive effect werestudied with dry-wet cycle method, cone penetration test and tensile test. The hightemperature stability, low-temperature crack resistance, fatigue property and the damage lawof mineral composition fiber asphalt mixture under sulfate solution corrosion effect werestudied through rutting test, trabecular low-temperature bend test and four-point bendingfatigue life test. Fiber-reinforced mechanism of asphalt mixture was deeply probed and the road performance of asphalt mixture was enhanced through means such as reinforcedenhancement, toughening effect, action of crack arrest and self-healing performanceenhancement. Compared with polyester fiber and basalt fiber, mineral compound fiber hasobvious price advantage by the economics analysis. Therefore, the idea of adding mineralcomposition fiber to modify the combination property of asphalt mixture under corrosionconditions was proposed. The dissertation Besides, the macroscopic damage mechanism ofasphalt mixture under the combined action of both dry-wet cycle and sulfate corrosion wasanalyzed. GM（1,N）gray prediction model was introduced to make a higher accuracyprediction of AC-13asphalt mixture mechanical properties under the dry-wet cycle andsulfate corrosion condition and the prediction results had a good coincidence with the reality.