【摘要】：降雪會(huì)使路面結(jié)冰,導(dǎo)致路面堵塞、交通事故頻發(fā)。運(yùn)用導(dǎo)電瀝青混凝土的電熱性能進(jìn)行除冰化雪具有安全有效、無需中斷交通的特點(diǎn),而如何制備高效的導(dǎo)電瀝青混凝土成為如今研究中的重點(diǎn)和熱點(diǎn)。本文根據(jù)復(fù)合材料學(xué)的原理,將石墨和碳纖維摻入SBS改性瀝青混合料中,制備成石墨碳纖維導(dǎo)電瀝青混凝土,并研究其導(dǎo)電性能和路用性能。(1)分別選擇不同石墨摻量和碳纖維摻量,固定粉膠比,將石墨、碳纖維與SBS改性瀝青和石灰石礦粉并攪拌均勻,制備成石墨碳纖維導(dǎo)電瀝青膠漿。對(duì)石墨碳纖維導(dǎo)電瀝青膠漿進(jìn)行軟化點(diǎn)、延度試驗(yàn)以及動(dòng)態(tài)剪切流變、布氏黏度和小梁彎曲試驗(yàn),推薦石墨和碳纖維的摻量范圍。結(jié)果表明:石墨的加入降低了石墨碳纖維瀝青膠漿的抗高溫變形能力和低溫抗裂性,并且顯著降低了石墨碳纖維瀝青膠漿的施工和易性。碳纖維的加入可以提高石墨碳纖維瀝青膠漿的抗高溫變形能力,但是降低了石墨碳纖維瀝青膠漿的低溫抗裂性和施工和易性。(2)分別對(duì)固定石墨摻量20%、碳纖維摻量0.1%、0.2%、0.3%和固定碳纖維0.2%、石墨10%、20%、30%五組瀝青混凝土進(jìn)行配合比設(shè)計(jì),研究碳纖維和石墨摻量對(duì)馬歇爾體積指標(biāo)、穩(wěn)定度和流值的影響,并確定最佳油石比分別為:5.43%、5.58%、5.71%、5.36%、5.58%、5.85%。在最佳油石比下制備馬歇爾試件,并測(cè)其電阻率和升溫試驗(yàn),得到石墨摻量30%+碳纖維摻量0.2%的導(dǎo)電性能最佳,石墨摻量20%+碳纖維摻量0.3%次之。(3)分析石墨碳纖維導(dǎo)電瀝青混凝土導(dǎo)電理論。分別對(duì)石墨摻量20%+碳纖維摻量0.3%和碳纖維0.2%+石墨30%兩組摻量在最佳油石比下制備車轍板試件,分別進(jìn)行電阻率、升溫試驗(yàn)和融冰化雪試驗(yàn),分別得到其升溫效率為83.24%、83.05%;其融冰效率為54.09%、55.77%。(4)分別對(duì)固定石墨摻量20%、碳纖維摻量0.1%、0.2%、0.3%和固定碳纖維0.2%、石墨10%、20%、30%五組瀝青混凝土進(jìn)行浸水馬歇爾、凍融劈裂、車轍、低溫彎曲試驗(yàn),得到的結(jié)果均滿足規(guī)范要求。其中,在滿足導(dǎo)電性能的試件中,石墨20%+碳纖維0.3%的試件路用性能好于石墨30%+碳纖維0.2%的試件。綜上所述,當(dāng)石墨摻量20%、碳纖維摻量0.3%時(shí),既可以獲得優(yōu)良的路用性能,也可以獲得優(yōu)良的導(dǎo)電性能,綜合性能最佳�？晒┕こ虘�(yīng)用。
[Abstract]:Snow will make the road ice, resulting in road congestion, traffic accidents occur frequently. It is safe and effective to deicing snow by using electric thermal properties of conductive asphalt concrete, and how to prepare conductive asphalt concrete with high efficiency has become the focus and hot spot in the present research. According to the principle of composite material science, graphite and carbon fiber were mixed into SBS modified asphalt mixture to prepare graphite carbon fiber conductive asphalt concrete. The conductive properties and road properties were also studied. (1) the graphite, carbon fiber and SBS modified asphalt and limestone ore powder were mixed uniformly with different graphite content and carbon fiber content respectively, fixed the ratio of powder to adhesive, and mixed with graphite, carbon fiber and asphalt and limestone ore powder. Graphite carbon fiber conductive asphalt paste was prepared. The softening point, ductility test, dynamic shear rheological test, Brinell viscosity and beam bending test of graphite carbon fiber conductive asphalt paste are carried out. The range of graphite and carbon fiber content is recommended. The results show that the addition of graphite can reduce the high temperature deformation resistance and low temperature cracking resistance of graphite carbon fiber asphalt paste, and significantly reduce the construction and workability of graphite carbon fiber asphalt paste. The addition of carbon fiber can improve the high temperature deformation resistance of graphite carbon fiber asphalt paste, but reduce the low temperature cracking resistance, construction and workability of graphite carbon fiber asphalt paste. (2) 20% of fixed graphite content, respectively. Carbon fiber content 0.1%, 0.2%, 0.3% and fixed carbon fiber 0.2%, graphite 10%, 20%, 30% asphalt concrete mix design, study carbon fiber and graphite content on Marshall volume index, The effects of stability and flow were determined to be 5.43%, 5.58%, 5.71%, 5.36%, 5.58%, 5.85%, respectively. Under the optimum oil-stone ratio, Marshall specimen was prepared, and its resistivity and heating test were measured. The electrical conductivity of 30% carbon fiber with 0.2% graphite content was found to be the best. The graphite content of 20% carbon fiber is 0.3%. (3) the conductive theory of graphite carbon fiber conductive asphalt concrete is analyzed. Two groups of graphite 20% carbon fiber 0.3% and 0.2% graphite 30% were prepared under the optimum oil-stone ratio, and the resistivity, heating test and snow melting test were carried out, respectively. The heating efficiency was 83.24% and 83.05% respectively. The melting efficiency is 54.09%, 55.77%. (4) 20% graphite, 0.1% carbon fiber, 0.2% carbon fiber, 0.3% fixed carbon fiber, 10% graphite, 20% graphite, respectively. The test results of immersion Marshall, freeze-thaw splitting, rut and low temperature bending of 30% five groups of asphalt concrete all meet the requirements of the code. Among them, the road performance of 20% graphite carbon fiber 0.3% test piece is better than that of 30% graphite carbon fiber 0.2% specimen. In conclusion, when the content of graphite and carbon fiber is 20% and 0.3%, both the road performance and electrical conductivity can be obtained, and the comprehensive performance is the best. Available for engineering applications.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U414

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