【摘要】：近年來,改性乳化瀝青在公路建設(shè)與公路養(yǎng)護(hù)中獲得了廣泛的應(yīng)用。目前,常用制備改性乳化瀝青的主要有的SBR、SBS改性劑,雖然其改性效果良好,但在制備以及使用過程中會出現(xiàn)一些問題。鑒于此,本文采用新型材料PU樹脂制備改性乳化瀝青,考慮到PU乳液制備設(shè)備及工藝比較困難,成本較高,以及沒有現(xiàn)成的符合要求的PU乳液摻入到乳化瀝青中制備改性乳化瀝青,本文采用PU先改性瀝青后乳化的方法制備PU改性乳化瀝青,研究PU改性乳化瀝青的性能。通過優(yōu)化工藝條件,確定PU改性瀝青制備方法,提出了最佳摻量。在最佳摻量下,PU改性劑能夠很好的在瀝青中進(jìn)行分散,具有很好的相容性,粒徑分散均勻且小于5μm,有利于乳化。制備的PU改性瀝青宏觀常規(guī)綜合性能較好,低溫抗裂性能改善最為明顯。通過進(jìn)行粘度進(jìn)行測試得出,PU改性劑增加了瀝青的粘度;對粘溫曲線數(shù)據(jù)進(jìn)行指數(shù)擬合,確定了三種PU改性瀝青施工溫度與乳化溫度。采用紅外光譜分析PU改性瀝青存在物理改性以及化學(xué)改性兩種改性方式;其中化學(xué)改性不受PU與基質(zhì)瀝青相容性的影響;而物理改性受PU與基質(zhì)瀝青相容性的影響。通過進(jìn)行乳化劑進(jìn)行優(yōu)選,確定采用乳化劑A進(jìn)行復(fù)配對三種PU改性瀝青進(jìn)行乳化,確定乳化劑的最佳摻量。同時進(jìn)行乳化前后對比研究得出,乳化作用并沒有破壞氨基甲酸酯基團(tuán)結(jié)構(gòu),只是在一定程度上的削弱,這與常規(guī)性能與玻璃化轉(zhuǎn)變溫度、吸熱量情況研究結(jié)果是一致的。通過以上方法制備的PU改性乳化瀝青具有較好使用性能與路用性能,其中韓國SK制備的PU改性乳化瀝青綜合性能最佳,通過以上分析能夠得出,韓國SK瀝青與PU改性劑具有優(yōu)異的相容性有關(guān)。因此,在道路工程中,PU改性乳化瀝青能夠具有非常好的應(yīng)用價值。
[Abstract]:In recent years, modified emulsified asphalt has been widely used in highway construction and highway maintenance. At present, there are some SBR,SBS modifiers commonly used to prepare modified emulsified bitumen. Although the modification effect is good, there will be some problems in the preparation and use of the modified asphalt. In view of this, this paper uses a new material PU resin to prepare modified emulsified asphalt, considering that the preparation equipment and process of PU emulsion is difficult, and the cost is relatively high. And there is no ready-made PU emulsion mixed into emulsified asphalt to prepare modified emulsified asphalt. In this paper, PU modified asphalt was used to prepare PU modified emulsified asphalt, and the properties of PU modified emulsified asphalt were studied. By optimizing the technological conditions, the preparation method of PU modified asphalt was determined, and the optimum content of asphalt was put forward. Under the optimum dosage, the PU modifier can be dispersed well in asphalt and has good compatibility. The particle size of the modifier is uniform and less than 5 渭 m, which is favorable for emulsifying. The macroscopical comprehensive properties of PU modified asphalt were better, and the anti-cracking performance at low temperature was the most obvious. The viscosity test shows that the viscosity of asphalt is increased by PU modifier, and the construction temperature and emulsifying temperature of three kinds of PU modified asphalt are determined by exponential fitting of viscosity temperature curve data. The physical modification and chemical modification of PU modified asphalt are analyzed by infrared spectroscopy, in which the chemical modification is not affected by the compatibility of PU and matrix asphalt, while the physical modification is influenced by the compatibility of PU and matrix asphalt. Through the optimization of emulsifier, the emulsifier A was used to emulsify three kinds of PU modified asphalt, and the optimum amount of emulsifier was determined. At the same time, it was found that the emulsifying effect did not destroy the carbamate group structure, but weakened to a certain extent, which was consistent with the results of conventional properties, glass transition temperature and heat absorption. The PU modified emulsified asphalt prepared by the above method has better service performance and road performance. Among them, the PU modified emulsified asphalt prepared by Korean SK has the best comprehensive performance, which can be obtained by the above analysis. Korean SK asphalt has excellent compatibility with PU modifier. Therefore, in road engineering, PU modified emulsified asphalt can have very good application value.
【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】：2017
【分類號】：U414

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本文編號：2431091