【摘要】：瀝青路面就地熱再生技術的實施受很多因素的影響,關鍵是受再生設備及工藝的影響。熱風循環(huán)再生設備是熱再生中經(jīng)常使用的一種,相對于其他設備對溫度具有較好的把控。溫度特征的控制是就地熱再生工藝施工控制的核心,因此對就地熱再生瀝青路面的施工過程溫度場的控制研究具有重要的意義。就地熱再生施工過程包含三個關鍵部分:對路面加熱、銑刨舊路面拌和新舊料、攤鋪碾壓。通過兩臺或三臺熱風循環(huán)加熱再生設備預熱路面,將路面軟化;隨后銑刨機將一定厚度的表層瀝青路面破碎形成料壟;根據(jù)施工需要添加新瀝青并經(jīng)復拌機拌和形成再生料;最后通過攤鋪碾壓形成再生路面。整個施工過程都與溫度息息相關,對各個施工階段的溫度場進行控制研究,以圖實現(xiàn)最佳的施工狀態(tài)既能保證施工質(zhì)量又能減少資源損耗。在流體力學和傳熱學理論的基礎上,論文利用fluent數(shù)值分析軟件對施工過程的路面預熱階段、料壟散熱階段、混合料攪拌階段進行了溫度場變化模擬實驗。通過對各個階段不同工況條件下的施工進行模擬,得出溫度云圖及攪拌過程流場云圖等,進而設計最佳的機械配置,以達到最佳的施工效果。進行再生路面施工不得不進行瀝青的老化與再生話題的討論。論文通過室內(nèi)試驗與仿真模擬相結(jié)合的方法研究就地熱再生過程中老化瀝青的擴散作用;根據(jù)Fick定律,分析再生劑在再生路面施工過程中與老化瀝青的擴散還原作用。通過對不同攪拌時間、不同溫度、不同粘度再生劑的試驗研究,得出不同因素在溫度影響下老化瀝青的還原程度;利用有限分析軟件模擬再生劑在舊料瀝青薄膜中不同溫度及拌和時間下的還原作用。在進行大量的室內(nèi)試驗和模擬實驗并得出相關結(jié)論后,將成果應用于山區(qū)國省干線瀝青路面的就地熱再生實際項目中。將現(xiàn)場測得各階段溫度場控制數(shù)據(jù)與數(shù)值模擬溫度結(jié)果相比較,并檢測其施工后路面的相關指標,結(jié)果表明模擬效果與實際情況相符,路面的使用性能滿足規(guī)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.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U416.217

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本文編號：2509163