本文選題：天然瀝青　切入點(diǎn)：老化　出處：《長安大學(xué)》2014年碩士論文

【摘要】：瀝青老化是影響道路瀝青使用性能的重要因素，老化后會導(dǎo)致路用性能的劣化。研究瀝青的熱老化機(jī)理，評價(jià)和預(yù)測道路瀝青的老化性能，為提高其抗老化性能提供理論基礎(chǔ)。本文利用多設(shè)備同步聯(lián)用技術(shù)對瀝青結(jié)合料的微觀組成與結(jié)構(gòu)進(jìn)行測試，，分析瀝青老化過程中微觀組成、結(jié)構(gòu)變化與宏觀流變特性、路用性能之間的作用關(guān)系。 首先制備基質(zhì)天然瀝青改性瀝青、TFOT短期老化后天然瀝青改性瀝青、TFOT+PAV長期老化天然瀝青改性瀝青，對制備的瀝青結(jié)合料進(jìn)行宏觀性能試驗(yàn)，得出天然瀝青最佳摻量在4%和6%之間，并發(fā)現(xiàn)老化后針入度和延度均減小，軟化點(diǎn)增大。其次分別對老化前后的瀝青結(jié)合料進(jìn)行紅外光譜分析，動態(tài)剪切流變試驗(yàn)和頻率掃描分析。得出原樣瀝青和改性瀝青短期老化（TFOT）和長期老化（PAV）后復(fù)數(shù)剪切模量均增大，相位角均減小；老化程度越大，則瀝青結(jié)合料的高溫穩(wěn)定性能就越好，高溫抗變形能力越強(qiáng)。天然瀝青改性瀝青結(jié)合料的復(fù)數(shù)模量數(shù)值隨著頻率的增大而變大，相位角隨著頻率的增大而減小，高頻區(qū)域和低頻區(qū)域速率不同。 然后利用熱分析（DSC、TG）、質(zhì)譜（MS）同步聯(lián)用技術(shù)，對瀝青結(jié)合料進(jìn)行熱分析和質(zhì)譜聯(lián)用分析，分析了DSC曲線分解峰特征和TG曲線質(zhì)量損失溫度范圍。對不同摻量改性瀝青的DSC曲線分解峰面積進(jìn)行積分，結(jié)合離子流強(qiáng)度分析得出天然瀝青最佳摻量在4%和6%之間；對于老化前后的DSC曲線分解峰進(jìn)行積分，短期老化后峰面積明顯減小，說明短期老化后瀝青結(jié)合料的熱性能變得比較穩(wěn)定了。對TG曲線進(jìn)行一階微分得到DTG曲線圖，發(fā)現(xiàn)瀝青結(jié)合料質(zhì)量損失的速率有三個(gè)臺階式的變化，比較未老化、短期老化和長期老化DTG曲線峰值的大小，得到未老化最大，短期老化次之，長期老化相對較小。最后從熱分析、質(zhì)譜分析聯(lián)用的角度考慮，TG-DSC-MS具有一致性，分解峰、熱重?fù)p失速率最大處和離子流強(qiáng)度值最大處的溫度是相互對應(yīng)的。
[Abstract]:Asphalt aging is an important factor affecting the performance of road asphalt, which will lead to the deterioration of road performance. The thermal aging mechanism of asphalt is studied, and the aging performance of road asphalt is evaluated and predicted. In order to provide a theoretical basis for improving the anti-aging properties of asphalt binders, the microstructure and structure of asphalt binders were tested by using multi-equipment synchronous technique, and the microstructure, structural changes and macroscopic rheological properties of asphalt during aging were analyzed. The functional relationship between road performance. Firstly, the natural asphalt modified asphalt (TFOT PAV) was prepared after the short term aging of natural asphalt modified asphalt (TFOT). The macroscopical properties of the prepared asphalt binder were tested. It is found that the optimum content of natural asphalt is between 4% and 6%. It is found that the penetration and ductility decrease and the softening point increases after aging. Secondly, infrared spectrum analysis of asphalt binder before and after aging is carried out. The dynamic shear rheological test and frequency scanning analysis show that the complex shear modulus increases and the phase angle decreases after the short term aging of the original asphalt and the modified asphalt. The higher the stability of asphalt binder at high temperature, the stronger the deformation resistance at high temperature. The complex modulus value of natural asphalt modified asphalt binder increases with the increase of frequency, and the phase angle decreases with the increase of frequency. The rates of high frequency region and low frequency region are different. Then thermal analysis and mass spectrometry were used to analyze bituminous binder by thermal analysis and mass spectrometry. The characteristics of decomposition peak of DSC curve and the temperature range of TG curve mass loss were analyzed. The area of decomposition peak of DSC curve of modified asphalt with different content was integrated, and the optimum content of natural asphalt was found to be between 4% and 6% according to the analysis of ionic current strength. For the decomposition peak of DSC curve before and after aging, the area of the peak decreases obviously after short-term aging, which indicates that the thermal property of bituminous binder becomes more stable after short-term aging. The DTG curve is obtained by first order differentiation of TG curve. It is found that the rate of mass loss of bitumen binder has three step changes. Comparing the peak value of DTG curve of non-aging, short-term aging and long-term aging, it is found that the unaging is the largest, and the short-term aging is the second. The long-term aging is relatively small. Finally, from the point of view of thermal analysis and mass spectrometry analysis, the TG-DSC-MS has the consistency, the decomposition peak, the temperature at the maximum loss rate of thermogravimetry and the maximum ion current intensity are corresponding to each other.
【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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