【摘要】：本論文在充分分析了國內(nèi)外瀝青路面冷再生技術(shù)的研究現(xiàn)狀后,依托住建部工程建設(shè)行業(yè)標準《冷伴用瀝青再生劑》編制項目,以甘肅省S201樹屏段和蘭州G109紅古段路面維修改造工程為研究對象,重新研究RAP摻量更高的再生混合料級配和路面結(jié)構(gòu)新型式,具體研究內(nèi)容如下:(1)對甘肅省干線公路地理環(huán)境、氣候條件、原路面結(jié)構(gòu)、交通量、歷史維修情況和路面常見病害進行調(diào)查分析,總結(jié)常見病害產(chǎn)生的原因;對S201樹屏段和蘭州G109紅古段路面進行彎沉分析和破損狀況評價,根據(jù)路面調(diào)查結(jié)果及病害情況確定路面結(jié)構(gòu)再生層厚度,進而提出路面結(jié)構(gòu)維修方案。(2)查閱文獻,總結(jié)國內(nèi)外冷再生混合料的設(shè)計方法,確定本論文再生混合料研究試驗方法和設(shè)計步驟;對原路面材料RAP級配及瀝青廢料性能進行檢測,提高RAP摻量,添加適量新礦料,根據(jù)“S型”級配曲線重新設(shè)計新集料級配;確定再生混合料中最佳水泥用量,通過對比試驗選擇性能更好的乳化瀝青品種并確定其用量;根據(jù)選定的試驗方法對設(shè)計的再生混合料進行高溫穩(wěn)定性、低溫抗裂性、水穩(wěn)定性和收縮性等性能測定。(3)查閱文獻,總結(jié)國內(nèi)外路面結(jié)構(gòu)設(shè)計方法,提出冷再生路面結(jié)構(gòu)設(shè)計步驟和路面結(jié)構(gòu)新型式;針對路面結(jié)構(gòu)不同的主導(dǎo)破損形式重新確定設(shè)計指標,并進行不同設(shè)計指標的軸載換算,確定不同設(shè)計指標的容許值;(4)研究線彈性斷裂力學(xué)模型和裂紋類型,推導(dǎo)出應(yīng)力強度因子計算公式;利用有限元分析軟件ABAQUS建立路面結(jié)構(gòu)模型,分析路面結(jié)構(gòu)在車輛荷載作用下的沉降變形及應(yīng)力應(yīng)變;在路面結(jié)構(gòu)模型中加入裂縫,分析模型在偏荷載和對稱荷載作用下裂縫的發(fā)展情況,并計算兩種荷載下裂縫尖端強度因子,預(yù)估路面結(jié)構(gòu)疲勞壽命。(5)以甘肅省S201樹屏段和蘭州G109紅古段路面結(jié)構(gòu)維修改造工程為研究對象,進行再生混合料施工應(yīng)用研究,驗證再生混合料在施工過程中的性能表現(xiàn);再生混合料鋪筑過程觀測混合料的出料狀態(tài)和路面狀態(tài),總結(jié)鋪筑過程中需控制的關(guān)鍵環(huán)節(jié)和注意事項。
[Abstract]:After fully analyzing the present research situation of cold recycling technology of asphalt pavement at home and abroad, this paper relies on the project of the construction industry standard of the Ministry of Housing "Cold Associated Asphalt Regeneration Agent". Taking S201 Shuping Section of Gansu Province and G109 Honggu Section of Lanzhou as research objects, the new type of recycled mixture gradation and pavement structure with higher RAP content was re-studied. The specific research contents are as follows: (1) to investigate and analyze the geographical environment, climatic conditions, original pavement structure, traffic volume, historical maintenance and common diseases of road surface in Gansu Province, and summarize the causes of common diseases; The pavement of S201 tree screen section and Lanzhou G109 Honggu section is analyzed by deflection analysis and damage evaluation. According to the pavement investigation results and disease conditions, the thickness of pavement structure regeneration layer is determined, and then the pavement structure maintenance scheme is put forward. (2) the literature is consulted. The design methods of cold recycled mixture at home and abroad are summarized, and the test methods and design steps of recycled mixture in this paper are determined. The RAP gradation of the original pavement material and the performance of the asphalt waste are tested, the RAP content is increased, the appropriate amount of new mineral material is added, and the new aggregate gradation is re-designed according to the "S-type" gradation curve. The best cement content in recycled mixture was determined, and the emulsified asphalt with better performance was selected by contrast test and the amount of emulsified asphalt was determined. According to the selected test methods, the high temperature stability, low temperature crack resistance, water stability and shrinkage properties of the designed recycled mixture were determined. (3) the design methods of pavement structure at home and abroad were summarized by referring to the literature and summarizing the design methods of pavement structure at home and abroad. The design steps of cold recycled pavement structure and the new type of pavement structure are put forward. According to the different main damage forms of pavement structure, the design index is redetermined, and the axle load conversion of different design index is carried out to determine the allowable value of different design index. (4) the linear elastic fracture mechanics model and crack type are studied, and the calculation formula of stress intensity factor is deduced. The model of pavement structure is established by using finite element analysis software ABAQUS, and the settlement deformation and stress strain of pavement structure under vehicle load are analyzed. Adding cracks to pavement structure model, analyzing the development of cracks under partial load and symmetrical load, and calculating the strength factor of crack tip under two kinds of loads. The fatigue life of pavement structure is estimated. (5) the pavement structure maintenance and reconstruction projects of S201 Shuping section of Gansu Province and G109 Honggu section of Lanzhou are studied, and the application of recycled mixture construction is studied. Verify the performance of recycled mixture in the construction process; The output state and pavement state of the mixture are observed during the laying process of recycled mixture, and the key links and matters needing attention in the process of paving are summarized.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U414

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本文編號：2464501