【作者】 陈炯；

【导师】 邱延峻；

【作者基本信息】 西南交通大学 ， 道路与铁道工程， 2007， 硕士

【摘要】 以高寒地区国道213线郎木寺至川主寺公路改建工程为依托工程，对路面表面层沥青混合料进行路用性能试验，选择一种性能较好的级配，进一步通过试验探讨压实温度、沥青用量和试件成型方式对混合料性能的影响，以水稳定性和低温抗裂性能为研究重点。试验结果表明，沥青混合料的路用性能与压实温度有着直接的关系，为了保证沥青混合料具有良好的路用性能，必须严格控制现场压实温度、防止低温压实是一个非常重要的控制环节。沥青混合料强度与沥青用量有很大关系。通过试验确定本研究AC—13沥青混合料的最佳沥青用量为5.0％。对于AC—13混合料，建议将击实次数从2×75次增加到2×85次，以取得4％的空隙率，获得更好的击实效果。采用旋转压实法成型试件进行沥青混合料配合比设计时，应适当提高各项指标，以便能设计出使用性能较好的混合料。由于花岗岩石料呈酸性，其与沥青粘附性很差，外加剂的掺入能有效提高其粘附性等级，增强集料与沥青的粘结力，从而改善混合料的路用性能，但不同掺入方案的改善效果不同。对高寒地区沥青混合料配合比设计方法，在马歇尔设计方法的基础上进行改进和优化，重点考虑低温抗裂性能、抗冻性能和耐老化的能力，选择密实类级配，通过试验确定低温压实临界温度。确定最佳沥青用量时，以空隙率VV=4％为目标。最佳沥青用量确定以后，进行高温稳定性、水稳定性及低温抗裂性能检验。对于酸性集料，应采取措施，提高混合料路用性能。更多还原

【Abstract】 Based on the reconstruction of National Road 213 Langmusi to Chuanzhusi, which is characterized of high latitude and frigidity, property tests of asphalt mixtures are carried out. Analysis and researches are accordingly followed, including: temperature of rolling, dosage of asphalt and method of molding specimen, in which water stability and the anti-crack ability in cold temperature are focused.It is concluded that all properties of asphalt concrete (AC) are closely correlated with temperature of rolling. To guarantee the construction of AC, therefore, the temperature of rolling must be strictly executed and supervised. Analyses also testify that the dosage of asphalt influences the performance of AC. The optimum for type AC-13 here is 5.0%.Considering the optimum for molding, in the process of Marshall specimen manufacture, 2×85, rather than 2×75, is recommended to achieve a 4% voids percentage. Furthermore, it is suggested that every criteria should be increased, if the Gyratory Rolling is utilized.For additives, it is approved that additives can strengthen the cohesion between acid aggregate, granite especially, and asphalt, which then enhance the performance of AC. However, different additives lead to different performance.Finally, some suggestion for AC design procedure in high latitude and frigidity are proposed, including: the key guideline should be anti-crack ability in cold temperature, anti-freezing ability and anti-aging ability; the dense gradation is better than other kinds; a critical temperature of rolling need to be figured out based on laboratory tests; the VV=4% can be set as goal when choosing the optimum dosage of asphalt; additives can improve the property of acid aggregate for AC.更多还原