本文選題：TLA+SBS復合改性瀝青 + 應力�。� 參考：《長安大學》2015年博士論文

【摘要】：大跨徑、大懸臂矮塔斜拉橋懸臂板剛度相對較小,腹板和撐板剛度較大,其混凝土箱梁與鋼箱梁的橋面受力類似,變形較大,容易引起懸臂板中部橋面鋪裝開裂,因此大跨徑、大懸臂矮塔斜拉橋橋面鋪裝技術是其關鍵技術之一。澆注式瀝青混凝土橋面鋪裝變形能力強,整體性優(yōu)良,具有優(yōu)良的抗低溫開裂、抗疲勞開裂性能和變形追從性,但是因所用改性瀝青的高溫性能、變形追從性和耐久性不足,很多橋面通車后不久即發(fā)生嚴重破壞。本研究在已有國內(nèi)外相關研究的基礎上,結合佛山石灣特大橋建設工程,深入系統(tǒng)地分析石灣特大橋橋面鋪裝的受力特性,采用TLA+SBS復合改性瀝青和摻加玄武巖礦物纖維,對TLA+SBS復合改性瀝青混凝土TGAC橋面鋪裝的配合比設計、路用性能、施工工藝和施工質(zhì)量控制方法進行了研究:1、石灣特大橋橋面鋪裝層最不利車載作用位置及各受力控制指標值通過建立大跨徑、大懸臂矮塔斜拉橋橋面復合鋪裝體系模型,采用三維有限元方法分析橋面鋪裝層的力學響應,以確定最不利車載作用位置及鋪裝層的各受力控制指標值。在此基礎上,提出了SBS改性AC-13C鋪裝混合料和復合改性TGAC-10鋪裝混合料的技術指標要求,并得到復合改性TGAC-10鋪裝下面層的疲勞壽命預估方程。2、TLA+SBS復合改性瀝青組成材料優(yōu)化研究通過對十三種TLA摻量的TLA+SBS復合改性瀝青分別進行試驗,得出了TLA+SBS復合改性瀝青的軟化點、當量軟化點、針入度、針入度指數(shù)PI、延力等隨TLA摻量的變化規(guī)律,確定了TLA+SBS復合改性瀝青的最佳配比,提出了TLA+SBS復合改性瀝青的技術性能指標要求。通過對TLA+SBS復合改性瀝青進行微觀性質(zhì)試驗,揭示了TLA+SBS復合改性瀝青的改性機理。3、TLA+SBS復合改性瀝青混凝土混合料組成優(yōu)化研究設計出公稱粒徑為9.5mm的TLA+SBS復合改性瀝青混凝土TGAC-10的級配范圍。采用五個不同TLA摻量(0%、20%、30%、40%、50%)的TLA+SBS復合改性瀝青分別對AC-10、SMA-10和TGAC-10瀝青混凝土進行馬歇爾試驗配合比設計,并對其路用性能進行了對比研究,得出了各種瀝青混凝土的路用性能指標隨TLA摻量的變化規(guī)律,確定了滿足橋面鋪裝路用性能要求的TGAC-10的目標配合比,提出了佛山石灣特大橋橋面鋪裝TGAC-10的技術要求。4、TLA+SBS復合改性瀝青混凝土橋面鋪裝質(zhì)量控制指標與方法根據(jù)室內(nèi)外試驗結果,依托實體工程,對TLA+SBS復合改性瀝青混凝土TGAC-10橋面鋪裝的施工工藝和施工質(zhì)量控制技術進行研究,提出了TLA+SBS復合改性瀝青混凝土TGAC橋面鋪裝的施工技術指南和質(zhì)量控制標準。5、TLA+SBS復合改性瀝青混凝土橋面鋪裝的使用性能通過對TLA+SBS復合改性瀝青混凝土TGAC橋面鋪裝跟蹤觀測以及PFWD模量、平整度、壓實度、車轍等使用性能檢測。結果表明:鋪裝下層TGAC-10瀝青混合料的生產(chǎn)配合比控制嚴格,滿足質(zhì)量控制要求;并且具有優(yōu)良的使用性能,達到施工控制要求,具有顯著的經(jīng)濟和社會效益。
[Abstract]:The cantilever plate stiffness of the large cantilever short tower cable-stayed bridge is relatively small, and the stiffness of the web and the bracing plate is large. The concrete box girder is similar to the steel box girder, and the deformation is larger. It is easy to cause the crack of the bridge deck in the middle of the cantilever plate. So the big span and the large cantilever and short tower cable-stayed bridge deck pavement technology is one of the key technologies. The concrete bridge deck pavement has strong deformability, good integrity, excellent resistance to low temperature cracking, fatigue cracking resistance and deformability. However, because of the high temperature performance of the modified asphalt, the deformation chasing and durability are insufficient, and many bridge surfaces have been damaged seriously after the traffic. This study is based on the foundation of related research both at home and abroad. On the basis of the construction project of the Shiwan special bridge in Foshan, the stress characteristics of the bridge deck pavement of the Shiwan bridge are systematically analyzed. The mixture ratio of TLA+SBS composite modified bitumen and basalt mineral fiber is used to design the mixture ratio of the TLA+SBS composite modified asphalt concrete TGAC bridge deck pavement, the road performance, the construction technology and the construction quality control method. 1, the most disadvantageous position of the vehicle on the deck of the bridge deck of the Shiwan special bridge and the index value of the force control, through the establishment of the model of the composite paving system of the large cantilever and short tower cable-stayed bridge deck, the mechanical response of the deck pavement is analyzed by the three-dimensional finite element method, so as to determine the most unfavorable position of the vehicle and the various loading layers of the deck. On this basis, the technical requirements of SBS modified AC-13C paving mixture and composite modified TGAC-10 paving mixture are proposed, and the fatigue life prediction equation of the lower layer of composite modified TGAC-10 pavement is obtained, and the optimization of the composition of TLA+SBS composite modified asphalt is studied through the TLA+SBS compound of thirteen kinds of TLA content. The modified asphalt was tested separately, and the softening point of TLA+SBS composite modified bitumen, the equivalent softening point, the needle penetration, the needle penetration index PI and the extension of the TLA were determined, and the optimum ratio of the TLA+SBS compound modified asphalt was determined. The technical performance requirements of the TLA+SBS compound modified asphalt were put forward. The compound modification of TLA+SBS was made by the compound modification of the asphalt. The microstructure test of asphalt was carried out, the modification mechanism of TLA+SBS composite modified asphalt was revealed.3, the composition optimization of TLA+SBS composite modified asphalt concrete mixture was designed to design the gradation range of TLA+SBS composite modified asphalt concrete TGAC-10 with nominal particle size of 9.5mm, and the TLA+SBS composite modification of five different TLA contents (0%, 20%, 30%, 40%, 50%) was used. The asphalt concrete of AC-10, SMA-10 and TGAC-10 asphalt concrete is designed by Marshall test match ratio respectively, and its road performance is compared. The change law of various asphalt concrete pavement performance indexes with the content of TLA is obtained, and the target mix ratio of TGAC-10 to meet the performance requirements of bridge deck pavement is determined. The technical requirements of the bridge deck pavement of the Shiwan special bridge in Foshan, Foshan, requirements.4, TLA+SBS composite modified asphalt concrete bridge deck pavement quality control index and method based on the laboratory and outdoor test results, relying on the solid engineering, the construction technology and construction quality control technology of TGAC-10 bridge deck pavement of TLA+SBS composite modified asphalt concrete are studied, and T is put forward. LA+SBS composite modified asphalt concrete TGAC bridge deck pavement construction technical guide and quality control standard.5, TLA+SBS composite modified asphalt concrete bridge deck pavement performance through the TLA+SBS composite modified asphalt concrete bridge deck pavement tracking observation and PFWD modulus, evenness, compaction, rutting and other performance testing results. The results show that the production fit ratio of the TGAC-10 asphalt mixture in the underlayer is strictly controlled and meets the requirements of quality control; and it has excellent performance and achieves construction control requirements, and has remarkable economic and social benefits.

【學位授予單位】：長安大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：U443.33

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