基于性能演变的水性环氧沥青开普封层施工方法优化

Optimization of Construction Method of Waterborne Epoxy Asphalt Cape Seal Based on Performance Evolution

为进一步提升水性环氧沥青开普封层使用品质,针对水性环氧沥青开普封层施工现存问题,借助有机玻璃界面状态图像观测与层间剪切试验,研究了不同固化状态下碎石封层黏结性能,提出了水性环氧沥青碎石封层两阶段分步式压实方法;系统分析了微表处摊铺时机对碎石封层沥青-碎石黏附与层间黏结性能的影响程度,探究了微表处开放交通时间与交通荷载对开普封层结构强度与表面功能的影响规律,确定了水性环氧沥青微表处最佳摊铺时机与开放交通条件;最终优化了水性环氧沥青开普封层施工方法,推荐了最佳施工参数与时机。结果表明:有机玻璃界面状态图像观测方法可快速、准确评价水性环氧沥青碎石封层的黏结防水状态,其结果与宏观试验一致。两阶段分步式压实方法能够有效提高水性环氧沥青开普封层层间黏结性能,增幅达14.29%以上,具体流程为:碎石封层摊铺后,立即采用前期轻微压实工艺进行碾压1次,待碎石封层养生至表干与实干之间时,采用后期标准压实工艺再碾压1次。基于碎石封层性能演变规律,可得微表处最佳摊铺时机为:碎石封层处于表干与实干状态之间。基于开普封层性能演变规律及交通荷载影响,可得最佳开放交通条件为:微表处摊铺后常温(25℃)持续养生1~1.5 h,适度开放交通,约2 h后完全开放。研究结果可为水性环氧沥青开普封层品质管控提供科学依据与理论支持。

This study addresses existing problems in the construction of waterborne epoxy asphalt cape seal to further improve its use quality.The bond performances of chip seal under different curing conditions were studied using interface state observation of organic glass and interlaminar shear tests.A two-stage and step-by-step rolling method of waterborne epoxy asphalt chip seal was proposed.The influence of micro-surfacing paving timing on the asphalt-macadam adhesion performance and inter-layer bonding performance of chip seal was analyzed systematically.The effects of opening timing and initial traffic volume of the micro-surfacing on the structural strength and surface function of the cape seal were explored.The optimal paving timing and open traffic conditions for the micro-surfacing were determined.Finally,the construction method of waterborne epoxy asphalt cape seal was optimized.Further,the optimal construction parameters and time were recommended.The results indicate that the interface-state observation method for organic glass can quickly and accurately evaluate the bonding and waterproof state of the waterborne epoxy asphalt cape seal,and the results are consistent with those of the macro test.The two-stage and step-by-step rolling method can improve the inter-layer bonding performance of the waterborne epoxy asphalt cape seal effectively.The growth rate is over 14.29%.The specific process is as follows:after the chip seal is paved,it is rolled once in an initial slight-compaction process;after curing to a state between surface dry and dry,it is rolled once using the standard rolling process at a later stage.Based on the performance-evolution law of chip seal,the optimal paving time of micro-surfacing is as follows:chip seal is between the surface-dry state and dry state.Based on the performance-evolution law of cape seal and the influence of the traffic load,the optimal open traffic conditions are as follows:after the micro-surfacing is paved and maintained for 1-1.5 h at ambient temperature(25℃),the traffic is opened appropriately.Moreover,the traffic can be fully opened after approximately 2 h.This provides a scientific basis and theoretical support for the quality control of waterborne epoxy asphalt cape seal.