發(fā)布時(shí)間：2018-04-10 22:49

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

【摘要】：煤直接液化殘?jiān)?Direct Coal Liquefaction Residue,DCLR)作為煤清潔利用過(guò)程中副產(chǎn)品,具備開(kāi)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(duì)DCLR采取了相應(yīng)的預(yù)處理手段,確定利用DCLR中的四氫呋喃可溶物(Tetrahydrofuran Soluble,THFS)對(duì)瀝青進(jìn)行改性。首先,本文研究了THFS改性瀝青的制備工藝并對(duì)其性能進(jìn)行評(píng)價(jià)與表征。基于正交試驗(yàn)和灰關(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(shí)間為45min,剪切速率為4000 r/min。通過(guò)性能評(píng)價(jià),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(guò)組分分析、元素分析、凝膠滲透色譜和紅外光譜等對(duì)THFS改性瀝青的微觀(guān)結(jié)構(gòu)進(jìn)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(lái)越大,但其元素組成沒(méi)有明顯變化,也沒(méi)有新官能團(tuán)的產(chǎn)生,說(shuō)明THFS對(duì)瀝青的改性屬于物理改性。其次,本文對(duì)THFS改性瀝青的流變特性進(jìn)行了研究。通過(guò)溫度掃描和頻率掃描試驗(yàn),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(qiáng),低溫性能和疲勞性能不斷下降,改性瀝青的適用范圍越來(lái)越窄。當(dāng)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(chē)轍結(jié)構(gòu)層)。第三,采用多指標(biāo)共同評(píng)價(jià)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(shí),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(diǎn)增量(Softening Point Increment,SPI)、殘留黏度比(Residual Viscosity Ratio,RVR)不斷增大。基于老化動(dòng)力學(xué)和THFS改性瀝青的微觀(guān)結(jié)構(gòu),發(fā)現(xiàn)THFS改性瀝青的老化過(guò)程屬于一級(jí)老化反應(yīng),建立了以軟化點(diǎn)為參數(shù)的一級(jí)老化動(dòng)力學(xué)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(shuō)明THFS改性瀝青的抗老化性能不斷變差。最后,本文利用馬來(lái)酸二辛酯(Dioctyl Maleate,DOM)對(duì)THFS改性瀝青的低溫性能進(jìn)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(huì)損傷其高溫性能。綜合THFS改性瀝青的各項(xiàng)性能,確定最佳復(fù)配方案為6%THFS+1%DOM。同時(shí),通過(guò)經(jīng)濟(jì)和環(huán)境效益分析表明,THFS復(fù)合改性瀝青不僅具有明顯的經(jīng)濟(jì)優(yōu)勢(shì),而且可以減少原油消耗、降低溫室氣體排放,經(jīng)濟(jì)社會(huì)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(xué)位授予單位】：北京建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U414

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 季節(jié);索智;石越峰;李鵬飛;趙永尚;;煤直接液化殘?jiān)c瀝青共混后的性能試驗(yàn)研究[J];公路交通科技;2016年05期

2 趙鵬;馮雷;劉蓋;劉亮;;煤液化殘?jiān)诘缆窞r青混凝土中的應(yīng)用研究[J];筑路機(jī)械與施工機(jī)械化;2016年02期

3 張德潤(rùn);羅蓉;陳_g;張勝振;盛英;;基于表面自由能的煤直接液化殘?jiān)男詾r青性能分析[J];中國(guó)公路學(xué)報(bào);2016年01期

4 劉均慶;宮曉頤;鄭冬芳;盛英;張勝振;朱豫飛;賴(lài)世q，

本文編號(hào)：1733275