本文選題：棱角性系數(shù) + 掃描電鏡　； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：公路快速發(fā)展，優(yōu)質(zhì)堿性集料因過度盲目地開采而匱乏，，可就地利用的酸性、中性等集料卻普遍被認(rèn)為與瀝青間粘附性差會引起路面早期水損害而限制了其合理利用。如何合理評價集料與瀝青之間的粘附機(jī)理，改善瀝青-集料界面粘附作用，對提高瀝青路面質(zhì)量，促進(jìn)酸性和中性集料在道路建設(shè)中的應(yīng)用具有重要理論和現(xiàn)實(shí)意義。 論文基于界面理論，采用數(shù)碼成像技術(shù)、集料棱角性系數(shù)測定儀、掃描電鏡、matlab分形維數(shù)計算等方法表征不同類型集料表面宏觀和微觀形貌；采用X射線衍射(XRD)分析不同巖性集料的化學(xué)成分；利用掃描電鏡研究不同類型的瀝青-集料的界面相結(jié)構(gòu)；借助拉拔儀測量不同類型的瀝青-集料間的界面相強(qiáng)度；利用動態(tài)剪切流變試驗(yàn)和X射線光電子能譜(XPS)分析瀝青與集料在界面處的化學(xué)作用；結(jié)合混合料路用性能測試，建立混合料路用性能指標(biāo)與瀝青-集料界面相強(qiáng)度間相互關(guān)系。 結(jié)果表明，集料顆粒的棱角性系數(shù)與其表面紋理分形維數(shù)、集料顆粒表面分形維數(shù)與瀝青-集料界面相強(qiáng)度均呈現(xiàn)良好的線性正相關(guān)關(guān)系，集料表面粗糙度越大，其與瀝青間形成界面相強(qiáng)度也越高；XPS試驗(yàn)分析得出，石灰?guī)r中的化學(xué)成分CaCO3與瀝青中含S元素的亞砜類官能團(tuán)之間存在化學(xué)作用，從而增強(qiáng)了瀝青-集料界面相強(qiáng)度。瀝青混合料路用性能測試結(jié)果表明，瀝青-集料界面相強(qiáng)度是影響混合料的路用性能優(yōu)劣的關(guān)鍵因素。增加集料顆粒表面紋理構(gòu)造是提高瀝青-集料界面相強(qiáng)度的有效方法。
[Abstract]:With the rapid development of highway, the high quality alkaline aggregate is scarce because of excessive and blind mining, and the acid and neutral aggregates which can be used locally are generally considered that the poor adhesion between asphalt and asphalt will cause early water damage to pavement and restrict its reasonable utilization. How to evaluate the adhesion mechanism between aggregate and asphalt reasonably and improve the interface adhesion between asphalt and aggregate has important theoretical and practical significance to improve the quality of asphalt pavement and promote the application of acidic and neutral aggregate in road construction. Based on the interface theory, the paper uses digital imaging technology, aggregate angular coefficient tester, scanning electron microscope MATLAB fractal dimension calculation methods to characterize the surface of different types of aggregate macro and micro morphology; The chemical composition of different lithologic aggregates was analyzed by X-ray diffraction (XRD), the interfacial phase structure of different types of asphalt-aggregate was studied by scanning electron microscope, the strength of interfacial phase between different types of bitumen and aggregate was measured by drawing instrument. The dynamic shear rheological test and X-ray photoelectron spectroscopy (XPS) were used to analyze the chemical action between asphalt and aggregate at the interface, and the relationship between the pavement performance index and the strength of asphalt aggregate interface was established. The results show that there is a good linear positive correlation between the angular coefficient of aggregate particle and its surface texture fractal dimension, and between the fractal dimension of aggregate particle surface and the strength of bituminous aggregate interface phase, and the greater the surface roughness of aggregate is, The higher the strength of the interfacial phase formed between it and the asphalt, the higher the strength of the interface phase. The chemical composition CaCO3 in the limestone and the sulfoxide functional group containing S element in the asphalt have a chemical interaction, thus enhancing the strength of the interface phase between the asphalt and the aggregate. The test results show that the interface strength between asphalt and aggregate is the key factor to influence the pavement performance of asphalt mixture. Increasing the texture of aggregate surface is an effective method to improve the phase strength of bitumen-aggregate interface.
【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】：U414

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