本文選題：寒區(qū) + 填塞材料��； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：涵洞是公路工程中的重要組成部分之一。寒冷地區(qū)涵洞同時要經(jīng)受過往車輛荷載、頻繁的干濕循環(huán)以及凍脹融沉的作用，一些涵洞在投入使用后不久就不同程度的出現(xiàn)墻體開裂和變形縫填塞材料脫落等病害，導(dǎo)致涵洞使用壽命縮短以及穩(wěn)定性降低。經(jīng)調(diào)查，涵洞滲漏是寒區(qū)涵洞病害發(fā)生的主要原因。變形縫防水失效，涵洞滲漏，往往會導(dǎo)致地基含水量增大，，引起不均勻地基凍脹；而地表水下滲又會加劇凍土地基的升溫和融化，使得涵墻基礎(chǔ)發(fā)生不均勻沉降。然而，針對寒冷地區(qū)涵洞變形縫處理方法及填塞材料選用，國內(nèi)尚沒有技術(shù)標(biāo)準(zhǔn)可以參照，盡管目前市場上的填塞材料種類繁多，但性能參差不齊。 本文根據(jù)寒區(qū)涵洞變形縫填塞材料性能要求，通過對瀝青改性機(jī)理的分析，選取了SBS、橡膠粉、硅藻土等改性劑，運用不同的工藝方法對基質(zhì)瀝青進(jìn)行改性處理，制備出不同種類的填塞材料；鑒于填塞材料的使用條件及受力狀況，通過針入度、彈性恢復(fù)、低溫柔性、黏度試驗、高溫流淌試驗以及微觀結(jié)構(gòu)觀測試驗等測試手段綜合評價了填塞材料的高低溫性能，比選幾種填塞材料的綜合性能。 填塞材料與縫隙界面之間的粘附強(qiáng)度高低與裂縫修補的成功與否息息相關(guān)，本文通過設(shè)置不同的影響因素并使用拉伸試驗?zāi)M填塞材料在裂縫中的受力狀況，研究了填塞材料的粘附強(qiáng)度變化，發(fā)現(xiàn)是否改性、溫度、水、不同界面處理方式等各種因素均會造成不同程度的粘附強(qiáng)度降低，對比評價表明良好的界面處理以及涂覆界面劑等界面處理方式可以提高粘附強(qiáng)度。 本文最后針對寒區(qū)環(huán)境特點，提出變形縫填塞材料施工技術(shù)要求。
[Abstract]:Culvert is one of the important parts of highway engineering. Culverts in cold areas also have to withstand the effects of passing vehicle loads, frequent dry-wet cycles and frost heaving and thawing, and some culverts appear, in varying degrees, diseases such as wall cracking and deformed joint filling materials falling off soon after being put into use. It can shorten the service life and reduce the stability of culvert. Through investigation, culvert leakage is the main cause of culvert disease in cold area. The waterproof failure of deformation joint and leakage of culvert often lead to the increase of water content of the foundation and cause the frost heave of the uneven foundation, while the infiltration of surface water will aggravate the temperature rise and melting of the frozen soil foundation, resulting in uneven settlement of the culvert wall foundation. However, there is no technical standard to refer to the treatment method of culvert deformation joint and the selection of filling material in cold region. Although there are many kinds of filling materials in the market at present, the performance is not uniform. According to the performance requirements of deformation joint filling material in culvert in cold area, through the analysis of asphalt modification mechanism, SBS, rubber powder, diatomite and other modifiers were selected to modify the matrix asphalt by different process methods. Different kinds of filling materials were prepared. In view of the conditions of use and stress of the packing materials, the penetration, elastic recovery, low temperature flexibility, viscosity test, The high and low temperature properties of the filling materials were comprehensively evaluated by means of high temperature flow test and microstructure observation test, and the comprehensive properties of several kinds of filling materials were compared. The adhesion strength between the filler material and the gap interface is closely related to the success of crack repair. In this paper, different factors are set up and tensile tests are used to simulate the stress condition of the filler material in the fracture. The change of adhesive strength of fillers was studied. It was found that various factors, such as modification, temperature, water and different treatment methods of interface, would result in the decrease of adhesion strength to different degrees. Comparison and evaluation show that good interfacial treatment and coating interfacial treatment can improve the adhesion strength. Finally, according to the environmental characteristics of cold area, the construction technology requirements of deformed joint packing material are put forward.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U449

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本文編號：1794419