本文選題：瀝青混凝土 + 導(dǎo)電特性　； 參考：《武漢理工大學(xué)》2014年博士論文

【摘要】：隨著我國瀝青混凝土路面建設(shè)的飛速發(fā)展，路面的養(yǎng)護(hù)與安全問題受到廣泛的重視，對養(yǎng)護(hù)時(shí)機(jī)的判斷，冬季的融雪化冰的研究已經(jīng)成為國內(nèi)外瀝青混凝土材料領(lǐng)域的研究熱點(diǎn)。近些年來，導(dǎo)電瀝青混凝土以其具有良好的壓敏性能，自愈合性能和電熱性能受到廣泛的關(guān)注并進(jìn)行了相關(guān)研究。目前，導(dǎo)電瀝青混凝土的很多制備技術(shù)，性能參數(shù)測試都是在室內(nèi)試驗(yàn)的基礎(chǔ)上完成的，這在一定程度上限制了導(dǎo)電瀝青混凝土在工程實(shí)踐中的應(yīng)用。因此，探明導(dǎo)電瀝青混凝土導(dǎo)電特性與原材料，外界條件的關(guān)系，揭示導(dǎo)電填料與瀝青的界面行為，研究導(dǎo)電瀝青混凝土老化后的性能，提出導(dǎo)電瀝青混凝土的施工關(guān)鍵技術(shù)對導(dǎo)電瀝青混凝土的推廣與應(yīng)用具有重要的理論指導(dǎo)意義。 本文從原材料與外界條件出發(fā)，研究了瀝青、導(dǎo)電填料和集料對導(dǎo)電特性的影響，揭示了不同壓力、不同溫度、不同濕度條件下的導(dǎo)電特性變化規(guī)律；利用X熒光分析(XRF)、掃描電鏡(SEM)、X射線衍射(XRD)、傅里葉變換紅外光譜(FTIR)、紫外可見光譜(UV-Vis)、接觸角測量等技術(shù)手段表征了導(dǎo)電填料與瀝青的界面行為；通過室內(nèi)加速老化的方法，測試?yán)匣蟮膶?dǎo)電瀝青混凝土的路用性能與電學(xué)性能，建立老化衰減模型，評價(jià)其服役行為；提出了導(dǎo)電瀝青混凝土的拌和、運(yùn)輸、攤鋪、碾壓技術(shù)，并測試了近2年的電學(xué)性能與路用性能的變化。主要結(jié)論如下： （1）為了獲得優(yōu)良的導(dǎo)電特性，集料的個(gè)體特征方面，其長寬比應(yīng)小于2:1，偏心率小于0.78為宜；集料的組合特征方面，Superpave與AC級(jí)配具有類似的試驗(yàn)結(jié)果，都具有良好的空隙和連通性。此外，鱗片石墨的表面間距與導(dǎo)電瀝青混凝土的礦料間隙率（VMA），空隙率（VV），石墨的體積摻量，石墨的粒徑有關(guān)，，并建立了導(dǎo)電瀝青混凝土的電阻模型。 （2）在恒力作用下導(dǎo)電瀝青混凝土出現(xiàn)電阻蠕變；在變力的作用下導(dǎo)電瀝青混凝土出現(xiàn)壓敏現(xiàn)象。這與導(dǎo)電通路的形成，石墨-瀝青-集料界面效應(yīng)，微裂縫效應(yīng)有關(guān)。 （3）在不同的溫度、濕度作用下，導(dǎo)電瀝青混凝土的電阻隨著溫度、濕度而變化，表現(xiàn)出一定的溫度、濕度效應(yīng)，表明導(dǎo)電瀝青混凝土經(jīng)過多年的服役后，其電阻不單反映當(dāng)時(shí)的內(nèi)部疲勞損傷情況，還會(huì)根據(jù)當(dāng)?shù)氐臍夂驐l件而發(fā)生不可逆的增加。 （4）鱗片石墨表面介孔多，孔隙發(fā)達(dá)，比表面積大，瀝青可在其表面形成較為發(fā)育的吸附溶化膜。瀝青與石墨的粘附功隨著瀝青的溫度升高而增加。鱗片石墨在瀝青中拌和時(shí)，處于先吸熱后放熱的過程。 （5）石墨-瀝青分散系統(tǒng)是一個(gè)松散的均勻堆積系統(tǒng)，導(dǎo)電瀝青膠漿中導(dǎo)電網(wǎng)絡(luò)的電阻主要就是石墨顆粒間的電阻。鱗片石墨顆粒在酸環(huán)境下ζ電位均為正值，表明石墨-瀝青體系的導(dǎo)電網(wǎng)絡(luò)是比較穩(wěn)定的體系。 （6）經(jīng)過室內(nèi)加速老化后，導(dǎo)電瀝青混凝土與普通瀝青混凝土相比，路用性能接近。導(dǎo)電瀝青混凝土的電學(xué)性能的衰減是由上至下的，由外而內(nèi)的。利用時(shí)溫等效原理建立了導(dǎo)電瀝青混凝土的在135℃老化條件下的路用性能與電學(xué)性能的老化衰減模型。 （7）建立了導(dǎo)電瀝青混凝土的拌和模型，提出了將石墨加入技術(shù)；確定了導(dǎo)電瀝青混凝土的拌和工藝。采用“三明治”結(jié)構(gòu)的電極形式，提出了導(dǎo)電瀝青混凝土的攤鋪與碾壓關(guān)鍵技術(shù)。鋪筑的導(dǎo)電瀝青混凝土路面具有良好的路用性能與電學(xué)性能，滿足瀝青混凝土路面損傷診斷，融雪化冰的需求。
[Abstract]:With the rapid development of the construction of asphalt concrete pavement in China, the maintenance and safety of the pavement have been widely paid attention to. The study of the snow melting ice in winter has become a hot spot in the field of asphalt concrete materials at home and abroad. In recent years, the conductive asphalt concrete has good pressure sensitive performance, and it has been used in recent years. The healing properties and electrothermal properties are widely concerned and related research. At present, a lot of preparation techniques of conductive asphalt concrete and performance parameters are tested on the basis of laboratory tests. This restricts the application of conductive asphalt concrete in engineering practice. Therefore, it is clear that the conductive asphalt concrete is explored. The relationship between the conductive properties and the raw material and the external conditions reveals the interface behavior of the conductive filler and the asphalt, and studies the performance of the aging of the conductive asphalt concrete. The key construction technology of the conductive asphalt concrete is of great theoretical significance to the popularization and application of the conductive asphalt concrete.
In this paper, the effects of asphalt, conductive fillers and aggregates on the electrical conductivity are studied from raw materials and external conditions, and the change rules of electrical properties under different pressure, temperature and humidity are revealed. X fluorescence analysis (XRF), scanning electron microscopy (SEM), X ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV visible light are used. Spectrum (UV-Vis), contact angle measurement and other technical means to characterize the interfacial behavior of conductive filler and asphalt; through indoor accelerated aging method, test the road performance and electrical properties of aging conductive asphalt concrete, establish an aging attenuation model, evaluate its service behavior, and put forward the mixing, transportation and paving of conductive asphalt concrete. The rolling technology and the changes of electrical performance and road performance in recent 2 years were tested.
(1) in order to obtain excellent electrical properties and the individual characteristics of aggregate, the ratio of length to width should be less than 2:1 and the eccentricity is less than 0.78. In combination with aggregate characteristics, Superpave and AC gradation have similar experimental results, and have good gap and connectivity. In addition, the surface spacing of the flake graphite and the mineral material of the conductive asphalt concrete The gap rate (VMA), void fraction (VV), volume of graphite and particle size of graphite are related to the resistance model of conductive asphalt concrete.
(2) the resistance creep of the conductive bituminous concrete under the action of constant force, and the pressure sensitive phenomenon of the conductive asphalt concrete under the action of variable force, which is related to the formation of the conduction channel, the graphite asphalt aggregate interface effect and the micro crack effect.
(3) under the action of different temperature and humidity, the resistance of the conductive asphalt concrete varies with the temperature and humidity. It shows a certain temperature and humidity effect. It shows that after years of service, the resistance of the conductive asphalt concrete is not only reflected the internal fatigue damage at that time, but also the irreversible increase according to the local climate conditions. Add.
(4) the surface of the flake graphite has a large mesoporous surface, which has a developed pore and a larger surface area. The asphalt can form a more developed adsorption and solubility film on its surface. The adhesion work of the pitch and graphite increases with the increase of the temperature of the asphalt. When the scale graphite is mixed in the asphalt, it is in the process of heat absorption and heat release.
(5) the graphite asphalt dispersion system is a loose and uniform accumulation system. The resistance of the conductive network in the conductive asphalt mortar is mainly the resistance between the graphite particles. The zeta potential of the scale graphite particles in the acid environment is positive, indicating that the conductive network of the graphite asphalt system is a relatively stable system.
(6) after accelerated aging, the performance of conductive asphalt concrete is close to that of ordinary asphalt concrete. The attenuation of electrical properties of conductive asphalt concrete is from top to bottom, from outside to inside. Using the principle of time temperature equivalence, the road performance and electrical properties of conductive asphalt concrete under 135 centigrade aging conditions are established. Attenuation model.
(7) the mixing model of conductive asphalt concrete was set up, the graphite adding technology was put forward, and the mixing process of the conductive asphalt concrete was determined. The key technology of the spreading and rolling of the conductive asphalt concrete was put forward by using the electrode form of "sandwich" structure. The pavement performance of the paved conductive asphalt concrete pavement was good and the performance of the pavement was good. Electrical properties meet the needs of damage diagnosis and snow melting and ice melting of asphalt concrete pavement.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528

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