山区国省干线沥青路面就地热再生施工过程温度场分析与控制研究
发布时间：2019-07-02 19:14
【摘要】：沥青路面就地热再生技术的实施受很多因素的影响,关键是受再生设备及工艺的影响。热风循环再生设备是热再生中经常使用的一种,相对于其他设备对温度具有较好的把控。温度特征的控制是就地热再生工艺施工控制的核心,因此对就地热再生沥青路面的施工过程温度场的控制研究具有重要的意义。就地热再生施工过程包含三个关键部分:对路面加热、铣刨旧路面拌和新旧料、摊铺碾压。通过两台或三台热风循环加热再生设备预热路面,将路面软化;随后铣刨机将一定厚度的表层沥青路面破碎形成料垄;根据施工需要添加新沥青并经复拌机拌和形成再生料;最后通过摊铺碾压形成再生路面。整个施工过程都与温度息息相关,对各个施工阶段的温度场进行控制研究,以图实现最佳的施工状态既能保证施工质量又能减少资源损耗。在流体力学和传热学理论的基础上,论文利用fluent数值分析软件对施工过程的路面预热阶段、料垄散热阶段、混合料搅拌阶段进行了温度场变化模拟实验。通过对各个阶段不同工况条件下的施工进行模拟,得出温度云图及搅拌过程流场云图等,进而设计最佳的机械配置,以达到最佳的施工效果。进行再生路面施工不得不进行沥青的老化与再生话题的讨论。论文通过室内试验与仿真模拟相结合的方法研究就地热再生过程中老化沥青的扩散作用;根据Fick定律,分析再生剂在再生路面施工过程中与老化沥青的扩散还原作用。通过对不同搅拌时间、不同温度、不同粘度再生剂的试验研究,得出不同因素在温度影响下老化沥青的还原程度;利用有限分析软件模拟再生剂在旧料沥青薄膜中不同温度及拌和时间下的还原作用。在进行大量的室内试验和模拟实验并得出相关结论后,将成果应用于山区国省干线沥青路面的就地热再生实际项目中。将现场测得各阶段温度场控制数据与数值模拟温度结果相比较,并检测其施工后路面的相关指标,结果表明模拟效果与实际情况相符,路面的使用性能满足规范要求。
[Abstract]:The implementation of geothermal recycling technology on asphalt pavement is affected by many factors, and the key is affected by recycling equipment and technology. Hot air cycle regeneration equipment is often used in thermal regeneration, compared with other equipment, it has a better control of temperature. The control of temperature characteristics is the core of the construction control of geothermal recycling technology, so it is of great significance to study the temperature field control of the construction process of local thermal recycled asphalt pavement. There are three key parts in the construction process of geothermal regeneration: heating the pavement, milling and planing the old pavement and mixing the new and old materials, spreading and rolling. The pavement is softened by preheating the pavement with two or three sets of hot air cycle heating and recycling equipment; then the surface asphalt pavement with a certain thickness is broken to form the material ridge by the milling machine; according to the construction needs, new asphalt is added and mixed by the compound mixer to form the recycled material; finally, the recycled pavement is formed by paving and rolling. The whole construction process is closely related to temperature. The temperature field in each construction stage is controlled and studied in order to realize the best construction state which can not only ensure the construction quality but also reduce the resource loss. Based on the theory of fluid mechanics and heat transfer, the simulation experiments of temperature field change in pavement preheating stage, material ridge heat dissipation stage and mixture mixing stage are carried out by using fluent numerical analysis software. Through the simulation of the construction under different working conditions in each stage, the temperature cloud picture and the mixing process flow field cloud picture are obtained, and then the best mechanical configuration is designed in order to achieve the best construction effect. It is necessary to discuss the aging and recycling of asphalt in the construction of recycled pavement. In this paper, the diffusion effect of aging asphalt in the process of geothermal regeneration is studied by means of laboratory test and simulation, and the diffusion reduction effect of recycled agent with aging asphalt in the construction process of recycled pavement is analyzed according to Fick's law. Through the experimental study of different stirring time, different temperature and different viscosity regeneration agent, the reduction degree of aging asphalt under the influence of temperature is obtained, and the reduction effect of regeneration agent in different temperature and mixing time of old asphalt film is simulated by finite analysis software. After a large number of laboratory tests and simulation experiments are carried out and the relevant conclusions are drawn, the results are applied to the actual projects of local thermal regeneration of asphalt pavement in mountainous provinces. The temperature field control data measured in each stage are compared with the numerical simulation temperature results, and the related indexes of the pavement after construction are tested. The results show that the simulation effect is consistent with the actual situation, and the performance of the pavement meets the requirements of the code.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217
本文编号：2509163
[Abstract]:The implementation of geothermal recycling technology on asphalt pavement is affected by many factors, and the key is affected by recycling equipment and technology. Hot air cycle regeneration equipment is often used in thermal regeneration, compared with other equipment, it has a better control of temperature. The control of temperature characteristics is the core of the construction control of geothermal recycling technology, so it is of great significance to study the temperature field control of the construction process of local thermal recycled asphalt pavement. There are three key parts in the construction process of geothermal regeneration: heating the pavement, milling and planing the old pavement and mixing the new and old materials, spreading and rolling. The pavement is softened by preheating the pavement with two or three sets of hot air cycle heating and recycling equipment; then the surface asphalt pavement with a certain thickness is broken to form the material ridge by the milling machine; according to the construction needs, new asphalt is added and mixed by the compound mixer to form the recycled material; finally, the recycled pavement is formed by paving and rolling. The whole construction process is closely related to temperature. The temperature field in each construction stage is controlled and studied in order to realize the best construction state which can not only ensure the construction quality but also reduce the resource loss. Based on the theory of fluid mechanics and heat transfer, the simulation experiments of temperature field change in pavement preheating stage, material ridge heat dissipation stage and mixture mixing stage are carried out by using fluent numerical analysis software. Through the simulation of the construction under different working conditions in each stage, the temperature cloud picture and the mixing process flow field cloud picture are obtained, and then the best mechanical configuration is designed in order to achieve the best construction effect. It is necessary to discuss the aging and recycling of asphalt in the construction of recycled pavement. In this paper, the diffusion effect of aging asphalt in the process of geothermal regeneration is studied by means of laboratory test and simulation, and the diffusion reduction effect of recycled agent with aging asphalt in the construction process of recycled pavement is analyzed according to Fick's law. Through the experimental study of different stirring time, different temperature and different viscosity regeneration agent, the reduction degree of aging asphalt under the influence of temperature is obtained, and the reduction effect of regeneration agent in different temperature and mixing time of old asphalt film is simulated by finite analysis software. After a large number of laboratory tests and simulation experiments are carried out and the relevant conclusions are drawn, the results are applied to the actual projects of local thermal regeneration of asphalt pavement in mountainous provinces. The temperature field control data measured in each stage are compared with the numerical simulation temperature results, and the related indexes of the pavement after construction are tested. The results show that the simulation effect is consistent with the actual situation, and the performance of the pavement meets the requirements of the code.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217
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