Road Performances of Mesoporous Nano-silica Modified Asphalt Binders

The objective of this paper was to find new modifier to improve the aging resistance and low temperature cracking resistance of asphalt. To investigate the aging resistance of modified asphalt binders, mesoporous nano-silica（doping Ti^（4＋）） was used as a asphalt modifier. Some physical properties including penetration, ductility, and softening point of asphalt were analyzed with RTFO（Rotating thin film oven） aging and ultraviolet aging. Moreover, the performances of high and low temperature of modified asphalt binders with pressure aging were tested by dynamic shear rheometer（DSR） test and bending beam rheometer（BBR） test. These results showed that the penetration decreased, low temperature ductility, and softening point increased when adding mesoporous nano-silica to base asphalt. After ultraviolet radiation aging, the penetration loss and ductility loss of modified asphalt decreased than that of original asphalt, the increase of softening point was also significantly reduced than that of base asphalt. Furthermore, The test results of DSR and BBR showed that the G＊sinδ and creep modulus‘s＇ of pressure aged asphalt decreased, but the creep rate ‘m＇ increased. It can be concluded that the aging resistance and cracking resistance of modified asphalt are improved by adding mesoporous nano-silica, especially the doping of Ti^（4＋） could improve the aging resistance obviously.

江西某高速公路开放式服务区设计方案研究

针对高速公路服务区与地方经济发展融合的需求,结合江西省上饶至浦城高速公路信州服务区设计实例,提出了开放式服务区的设计理念,对开放式服务区的设计方案、参数取值进行分析和论述;同时结合服务区地质条件、工程规模、带动地方经济发展等因素,在控制服务区工程投资的基础上,确定了最优的开放式服务区设计方案。

铁路智慧预制场建设理念及实践

我国高铁按照“工厂化预制、机械化安装、信息化管理”技术路线,开展面向全生命周期的装配式建造技术探索,取得了一系列成果。针对预制场智能建造应用过程中存在的评价体系不完善等问题,围绕“信息化优化流程、机械化减员增效、绿色人文可持续发展”建场目标,提出从“综合管控平台、自动化生产线、绿色工地”3个维度来评价预制场先进性的理念。以京滨铁路盾构管片场为应用场景,围绕3个维度的建设内容和重点工作进行系统设计,实践验证该方式可提升预制场的整体效率,为其他预制构件场规划建设提供参考。