發(fā)布時間：2018-04-10 22:49

  本文選題：DCLR + THFS��； 參考：《北京建筑大學》2017年碩士論文

【摘要】：煤直接液化殘渣(Direct Coal Liquefaction Residue,DCLR)作為煤清潔利用過程中副產(chǎn)品,具備開發(fā)為道路用石油瀝青改性劑的可能性。根據(jù)DCLR的材料特性,對DCLR采取了相應(yīng)的預處理手段,確定利用DCLR中的四氫呋喃可溶物(Tetrahydrofuran Soluble,THFS)對瀝青進行改性。首先,本文研究了THFS改性瀝青的制備工藝并對其性能進行評價與表征�；谡辉囼灪突谊P(guān)聯(lián)分析法,確定THFS改性瀝青的最佳制備工藝為剪切溫度150oC,剪切時間為45min,剪切速率為4000 r/min。通過性能評價,發(fā)現(xiàn)THFS可提高瀝青的高溫性能,降低其低溫性能,推薦THFS摻量為6%。通過組分分析、元素分析、凝膠滲透色譜和紅外光譜等對THFS改性瀝青的微觀結(jié)構(gòu)進行表征,發(fā)現(xiàn)隨著THFS摻量的增加,改性瀝青的分子量和膠體不穩(wěn)定系數(shù)Ic越來越大,但其元素組成沒有明顯變化,也沒有新官能團的產(chǎn)生,說明THFS對瀝青的改性屬于物理改性。其次,本文對THFS改性瀝青的流變特性進行了研究。通過溫度掃描和頻率掃描試驗,并結(jié)合CAM模型,發(fā)現(xiàn)THFS摻量越高,改性瀝青的高溫性能不斷增強,低溫性能和疲勞性能不斷下降,改性瀝青的適用范圍越來越窄。當THFS摻量控制在6%之內(nèi),改性瀝青可用于瀝青路面的中、下面層(抗車轍結(jié)構(gòu)層)。第三,采用多指標共同評價THFS改性瀝青的感溫性能,結(jié)果表明THFS的加入可改善瀝青的感溫性能。同時,本文還發(fā)現(xiàn)隨THFS摻量的增加,改性瀝青的殘留針入度比(Residual Penetration Ratio,RPR)、殘留延度(Residual Ductility,RD)不斷減小,軟化點增量(Softening Point Increment,SPI)、殘留黏度比(Residual Viscosity Ratio,RVR)不斷增大�；诶匣瘎恿W和THFS改性瀝青的微觀結(jié)構(gòu),發(fā)現(xiàn)THFS改性瀝青的老化過程屬于一級老化反應(yīng),建立了以軟化點為參數(shù)的一級老化動力學方程。隨THFS摻量的增加,改性瀝青的老化反應(yīng)速率k不斷增大,反應(yīng)活化能Ea不斷減少,膠體不穩(wěn)定系數(shù)Ic以及老化前、后羰基峰面積比值不斷增大,說明THFS改性瀝青的抗老化性能不斷變差。最后,本文利用馬來酸二辛酯(Dioctyl Maleate,DOM)對THFS改性瀝青的低溫性能進行改善,發(fā)現(xiàn)DOM可以改善瀝青的低溫、疲勞、感溫和抗老化性能,但會損傷其高溫性能。綜合THFS改性瀝青的各項性能,確定最佳復配方案為6%THFS+1%DOM。同時,通過經(jīng)濟和環(huán)境效益分析表明,THFS復合改性瀝青不僅具有明顯的經(jīng)濟優(yōu)勢,而且可以減少原油消耗、降低溫室氣體排放,經(jīng)濟社會效益顯著。
[Abstract]:Direct Coal Liquefaction residuetion (DCLRR), as a by-product of coal clean utilization, has the possibility of being developed as a road asphalt modifier.According to the material properties of DCLR, the corresponding pretreatment method was adopted for DCLR. It was determined that Tetrahydrofuran SolubleTHFSin DCLR was used to modify asphalt.Firstly, the preparation process of THFS modified asphalt was studied and its properties were evaluated and characterized.Based on orthogonal test and grey correlation analysis, the optimum preparation process of THFS modified asphalt was determined as follows: shear temperature 150oC, shearing time 45min, shear rate 4000 rmin.Through the performance evaluation, it is found that THFS can improve the high temperature performance of asphalt and reduce its low temperature performance. The content of THFS is recommended to be 6%.The microstructure of THFS modified asphalt was characterized by component analysis, elemental analysis, gel permeation chromatography and infrared spectroscopy. It was found that the molecular weight and colloidal instability coefficient IC of modified asphalt increased with the increase of THFS content.However, there is no obvious change in the composition of THFS and no new functional group is produced, which indicates that the modification of asphalt by THFS belongs to physical modification.Secondly, the rheological properties of THFS modified asphalt were studied.Through temperature and frequency scanning tests and CAM model, it is found that the higher the content of THFS is, the higher the high temperature performance of modified asphalt is, the lower the low temperature performance and the fatigue property are, the narrower the application range of modified asphalt is.When the THFS content is controlled within 6%, the modified asphalt can be used in the middle and lower layer of asphalt pavement (rutting resistant structure layer).Thirdly, the temperature sensing performance of THFS modified asphalt is evaluated by using multiple indexes. The results show that the addition of THFS can improve the temperature sensing performance of asphalt.Based on the aging kinetics and microstructure of THFS modified asphalt, it is found that the aging process of THFS modified asphalt is a first-order aging reaction. The first-order aging kinetic equation with softening point as the parameter is established.With the increase of THFS content, the aging reaction rate k of modified asphalt increases, the activation energy EA decreases, the colloid instability coefficient IC and the ratio of carbonyl peak area after aging increase.It shows that the aging resistance of THFS modified asphalt is getting worse.Finally, the low temperature performance of THFS modified asphalt was improved by dioctyl maleate dioctyl maleate. It was found that DOM could improve the low temperature, fatigue, temperature sensitivity and aging resistance of THFS modified asphalt, but it would damage its high temperature performance.According to the properties of THFS modified asphalt, the optimum blending scheme was determined as 6%THFS 1 DOM.At the same time, the analysis of economic and environmental benefits shows that the modified asphalt has not only obvious economic advantages, but also can reduce the consumption of crude oil, reduce greenhouse gas emissions, and remarkable economic and social benefits.
【學位授予單位】：北京建筑大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U414

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本文編號：1733275