令我印象最深的是，在道路养护和处理方面，吴朝帆博士介绍了一种半刚性沥青

令我印象最深的是，在道路养护和处理方面，吴朝帆博士介绍了一种半刚性沥青路面基层微裂缝均匀化再生处理技术，传统的沥青路面病害处理方法不能解决水稳定基层的收缩开裂问题，在横向阶段，采用了一种微裂缝均质再生处理技术，沥青表层可能再次出现反射裂缝，在水和荷载作用下，仍会出现泵送、路面水、层间分层等现象，出现空洞现象，因此，沥青路面层的裂缝主要表现为水荷载作用下的反射裂缝，提出了半刚性基层微裂纹均匀化再生处理技术，该技术主要依靠路面视觉维护平台，辅助特殊检测方法，并结合均匀化处理、微裂缝再生等一整套措施，对基层进行综合处理，转化为永久性路面结构层，能从根本上解决半刚性基层开裂引起的反射裂缝，实现耐久性或长寿命沥青路面的改造和摊铺，与其他老路技术相比，可以发现在开挖方面，旧路处理技术主要采用原基层开挖，分层或新基层完全铺筑两种措施，虽然该方法能治疗路面病害，但仍有两种方法可供使用，解决不了水稳定基层收缩开裂问题，从冷循环和基层技术方面，老技术主要采用基层冷铣、物料筛分等方式，新增集料和再生剂，混合后摊铺碾压，室温摊铺，作为路面结构的新基层或底基层，其优点是可以采用原基层材料，但再生基层刚度较大，干缩、温缩变形引起的变形引起收缩开裂，导致路面反射裂缝，再生基层的内层低于路面结构，对路基上的排空、积水等病害没有根治措施，通过这些比较，得出了再生基层的施工方案，可见，目前采用水稳材料技术，可以有效地解决稳定基层开裂引起的反射裂缝，并能有效地处理路基病害，根据挠度数据分析确定夯击能量和夯击位置避免对路基稳定性造成破坏，此外，该方法不需要对基层进行碾磨、破碎、筛分，直接在水稳定基层上产生微裂缝，均匀化再生，施工工艺简单，利用老基层的强度，有效地处理基层收缩裂缝，采用淋船注浆水稳基层技术，可处理路面结构层内层空隙与路面积水，防止路面反射裂缝，还能将旧路材变成宝藏，对旧路水稳定基层进行循环利用，节约新的水稳基层材料，减少环境污染，节约工程成本，不需要拌和、摊铺、碾压等工序，施工机械工序少，半封闭或部分封闭施工，该技术在今年WTC会议上也作了详细介绍，并得到广泛认可，技术成果具有重要的社会意义，半刚性基层沥青路面大修的经济和环境效益

What impresses me most is that in terms of road maintenance and treatment, Dr. Wu Chaofan introduced a micro crack homogenization and regeneration treatment technology for semi-rigid asphalt pavement base. The traditional asphalt pavement disease treatment method can not solve the shrinkage and cracking problem of water stabilized base. In the horizontal stage, a micro crack homogenization and regeneration treatment technology is adopted, Reflective cracks may appear again on the asphalt surface. Under the action of water and load, pumping, pavement water, interlayer delamination and other phenomena will still appear, and cavities will appear. Therefore, the cracks of the asphalt pavement layer are mainly reflected cracks under the action of water load. A micro crack homogenization and regeneration treatment technology for semi-rigid base layer is proposed, which mainly depends on the pavement visual maintenance platform, Auxiliary special detection methods, combined with a complete set of measures such as homogenization treatment and micro crack regeneration, comprehensively treat the base course and transform it into a permanent pavement structure layer, which can fundamentally solve the reflection cracks caused by the cracking of semi-rigid base course and realize the transformation and paving of durable or long-life asphalt pavement. Compared with other old road technologies, it can be found that in terms of excavation, The old road treatment technology mainly adopts two measures: excavation of the original base course, layering or complete paving of the new base course. Although this method can treat pavement diseases, there are still two methods available, which can not solve the problem of shrinkage and cracking of water stabilized base course. In terms of cold circulation and base course technology, the old technology mainly adopts the methods of cold milling and material screening of base course, and adds aggregates and regenerants, Paving and rolling after mixing and paving at room temperature. As a new base or subbase of the pavement structure, it has the advantage that the raw base material can be used, but the recycled base has high stiffness. The deformation caused by dry shrinkage and temperature shrinkage deformation causes shrinkage cracking, resulting in pavement reflection cracks. The inner layer of the recycled base is lower than the pavement structure, and there are no radical measures for the drainage, ponding and other diseases on the subgrade, Through these comparisons, the construction scheme of recycled base course is obtained. It can be seen that the current use of water stabilized material technology can effectively solve the reflection cracks caused by the cracking of stabilized base course, and effectively deal with the subgrade diseases. The tamping energy and tamping position are determined according to the deflection data analysis to avoid damaging the subgrade stability. In addition, this method does not need to grind the base course Crushing and screening can directly produce micro cracks on the water stabilized base course, homogenize and regenerate. The construction process is simple. The shrinkage cracks of the base course can be effectively treated by using the strength of the old base course. The technology of drenching and grouting water stabilized base course can deal with the gap in the pavement structure layer and the water in the road area, prevent the reflection cracks of the pavement, and turn the old road materials into treasures, Recycle the water stabilized base course of the old road, save new water stabilized base course materials, reduce environmental pollution and save project cost. There is no need for mixing, paving, rolling and other processes. There are few construction mechanical processes and semi closed or partially closed construction. This technology was also introduced in detail at this year's WTC meeting and widely recognized. The technical achievements have important social significance, Economic and environmental benefits of overhaul of semi-rigid base asphalt pavement

What impressed me the most was that, in the aspect of road maintenance and treatment, Dr. Wu Chaofan introduced a uniform recycling technology of micro-cracks in semi-rigid asphalt pavement base. The traditional method of asphalt pavement disease treatment can't solve the shrinkage and cracking problem of water-stabilized base. In the transverse stage, a uniform recycling technology of micro-cracks was adopted, and the asphalt surface layer may have reflection cracks again, and under the action of water and load, there will still be pumping, pavement water, interlayer delamination and other phenomena. Cavity phenomenon appears, therefore, the cracks in asphalt pavement layer are mainly reflected cracks under the action of water load. This paper puts forward the technology of micro-cracks homogenization and regeneration in semi-rigid base, which mainly relies on pavement visual maintenance platform, assists with special detection methods, and combines a set of measures such as homogenization treatment and micro-cracks regeneration to comprehensively treat the base and transform it into a permanent pavement structure layer, which can fundamentally solve the reflection cracks caused by semi-rigid base cracking. To realize the reconstruction and paving of durable or long-life asphalt pavement, compared with other old road technologies, it can be found that in terms of excavation, the old road treatment technology mainly adopts two measures: excavation of the original base, layering or complete paving of the new base. Although this method can treat pavement diseases, there are still two methods available, which can not solve the shrinkage and cracking problem of the water-stabilized base. From the aspects of cold circulation and base technology, the old technology mainly adopts cold milling of base and material screening, etc. Adding aggregate and recycling agent, paving and rolling after mixing, and paving at room temperature, can be used as the new base or subbase of pavement structure. Its advantages are that the original base material can be used, but the recycled base has higher rigidity, and the deformation caused by drying shrinkage and temperature shrinkage causes shrinkage cracking, which leads to pavement reflection cracks. The inner layer of the recycled base is lower than the pavement structure, and there is no radical measure for diseases such as emptying and water accumulation on subgrade. Through these comparisons, the construction scheme of recycled base is obtained. It can be seen that, At present, adopting the water-stabilized material technology can effectively solve the reflection cracks caused by cracking of the stabilized base, and effectively deal with the roadbed diseases. According to the deflection data analysis, the tamping energy and tamping position are determined to avoid damaging the roadbed stability. In addition, this method does not need to grind, crush and screen the base, directly generates microcracks on the water-stabilized base, uniformly regenerates, and has simple construction technology. By using the strength of the old base, the shrinkage cracks of the base can be effectively dealt with. The technology of water-stabilized base by boat grouting can deal with gaps in the inner layer of pavement structure layer and stagnant water on pavement, prevent pavement reflection cracks, turn old road materials into treasures, recycle old road water-stabilized base materials, save new water-stabilized base materials, reduce environmental pollution, save engineering cost, do not need working procedures such as mixing, paving and rolling, and have few working procedures of construction machinery, semi-closed or partially closed construction. This technology was also introduced in detail at this year's WTC meeting and was widely used.