基于抗滑性能的钢桥面铺装用环氧沥青混合料设计

发布时间：2018-01-21 17:42

  本文关键词： 钢桥面铺装 抗滑性能 骨架密实结构 V-S方法 长期服役过程 恶劣气候条件　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：环氧沥青混合料EA-10以其优异的物理、力学性能,成为受力特性异常复杂的钢桥面铺装的理想材料。但EA-10采用悬浮密实结构,路面构造深度不足,一旦出现雨水等恶劣气候,车辆在高速行驶时易出现打滑。断级配骨架结构沥青混合料具有较好的抗滑性能,为了兼顾钢桥面铺装物理、力学性能要求,本文通过设计骨架密实型环氧沥青混合料来提高钢桥面铺装表层的抗滑性能。首先,引入基于粗集料多点支撑骨架状态的V-S体积设计方法进行骨架密实型环氧沥青混合料VS-EA10的级配设计,通过室内试验评价VS-EA10的路用性能以及抗滑性能。试验结果表明,与EA-10和SMA-10相比,VS-EA10保持了EA-10优良的高温稳定、水稳定性能以及较高的摩擦系数(BPN),构造深度(MTD)相对于EA-10有了很大的提高,甚至优于SMA-10,低温条件下的变形能力变弱、低温脆性有所加重。其次,利用小型行车荷载模拟系统MMLS3进行VS-EA10长期抗滑性能研究,BPN和MTD作为抗滑指标,通过回归分析拟合VS-EA10的长期抗滑性能衰减规律,引入国际摩擦指数IFI(F60, SP)综合评价VS-EA10的抗滑性能,EA-10和SMA-10作为对比,通过预测各混合料的BPN、MTD达到临界状态(BPN≥45、MTD≥0.55mm)时所需的模拟次数,将13万次时SMA-10的F60值作为钢桥面铺装表层的抗滑参考值,VS-EA10的F60衰减到抗滑参考值所需模拟次数远远大于SMA-10,表明VS-EA10的抗滑耐久性远远优于SMA-10。进而,对VS-EA10进行雨水气候和冰冻气候条件下的抗滑性能研究,主要考虑水膜厚度、斑驳冰面、完全冰面等不同的路面状况,试验研究各混合料表层的抗滑值和抗滑性能衰减率在上述路面状况下的变化规律,EA-10和SMA-10作为对比,结果表明VS-EA10在雨水气候和冰冻气候条件下比EA-10具有更好的抗滑性能。最后,基于灰色绝对关联度进行VS-EA10设计参数优选,通过确定各混合料综合抗滑性能的优劣顺序,给出级配设计建议参数,在现有级配设计理论的基础上结合本文进行的室内试验,提出基于抗滑性能的VS-EA10混合料设计方法。分析结果表明,VS-EA10的综合抗滑性能优于EA-10和SMA-10,级配设计过程中的细集料试验指数n推荐在0.20～0.30范围内取值,条件允许下尽量取高值。
[Abstract]:Epoxy asphalt mixture (EA-10) is an ideal material for steel bridge deck pavement due to its excellent physical and mechanical properties. However, EA-10 adopts suspended dense structure. The pavement structure depth is not enough, once Rain Water and other bad weather, vehicles are prone to skid when driving at high speed. The asphalt mixture with broken grade skeleton structure has good skid resistance, in order to take into account the steel bridge deck pavement physics. In order to improve the skid resistance of steel bridge deck surface layer, this paper designs the framework dense epoxy asphalt mixture to improve the skid resistance of steel bridge deck pavement. The V-S volume design method based on coarse aggregate multi-point support skeleton state is introduced to design the VS-EA10 gradation of the skeleton dense epoxy asphalt mixture. The road performance and skid resistance of VS-EA10 are evaluated through laboratory tests. The results show that the performance is compared with that of EA-10 and SMA-10. VS-EA10 keeps excellent high temperature stability, water stability and high friction coefficient of EA-10. Compared with EA-10, the structure depth of VS-EA10 is greatly improved. Even better than SMA-10, the deformability becomes weaker and the low temperature brittleness is aggravated at low temperature. Study on the Long-Term Slide Resistance of VS-EA10 by using the Small-Scale load Simulation system (MMLS3). The VS-EA10 and MTD are used as the anti-skid indexes. Through regression analysis to fit the long-term anti-slide performance attenuation rule of VS-EA10, the international friction index IFII-F60, SP) is introduced to evaluate the anti-skid performance of VS-EA10. Compared with SMA-10, EA-10 and SMA-10 are used to predict the simulation times required for each mixture to reach the critical state of BPN 鈮，

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