本文選題：紫外光老化　切入點(diǎn)：抗紫外光添加劑　出處：《西安建筑科技大學(xué)》2015年碩士論文

【摘要】：瀝青及瀝青混合料抗紫外光老化研究正處于發(fā)展階段,目前主要向?yàn)r青中加入抗紫外光添加劑來(lái)提高瀝青及瀝青混合料的抗紫外光老化性能,但是抗紫外光添加劑種類繁多且大多只是針對(duì)單種抗紫外光添加劑對(duì)瀝青的抗紫外光老化性能進(jìn)行研究,關(guān)于復(fù)配抗紫外光添加劑對(duì)瀝青及瀝青混合料抗紫外光老化性能的研究卻涉及很少,因此有必要尋找抗紫外光添加劑合適的復(fù)配類型并展開其對(duì)改善瀝青及瀝青混合料抗紫外光老化性能的研究。選取UV-531,Ti O2,Si O2三種抗紫外光添加劑,首先通過(guò)試驗(yàn)研究對(duì)比分析單種抗紫外光添加劑和各類型復(fù)配抗紫外光添加劑對(duì)瀝青及瀝青混合料抗紫外光老化性能的改善效果,以確定最佳的抗紫外光添加劑類型及劑量,其次采用ABAQUS有限元軟件對(duì)上面層加入各類型抗紫外光添加劑的路面結(jié)構(gòu)進(jìn)行模擬計(jì)算,以說(shuō)明上述確定的抗紫外光添加劑對(duì)經(jīng)紫外光老化的路面結(jié)構(gòu)受力性能的改善效果,最后進(jìn)行瀝青砂涂層設(shè)計(jì),按最佳劑量向?yàn)r青砂中加入上述確定的抗紫外光添加劑,分別對(duì)加涂層和未加涂層瀝青混合料試件進(jìn)行紫外光老化后的高低溫性能試驗(yàn),通過(guò)對(duì)比分析說(shuō)明不同級(jí)配和厚度的瀝青砂涂層對(duì)瀝青混凝土路面抗紫外光老化性能的改善效果,以確定瀝青砂涂層在瀝青路面抗紫外光老化方面的作用。得出如下結(jié)論:(1)復(fù)配抗紫外光添加劑對(duì)改善瀝青及瀝青混合料抗紫外光老化性能具有更好的效果,復(fù)配類型為UV-531+Ti O2,復(fù)配比例為1:2.5,但是對(duì)于年平均氣溫較低、紫外光照較弱地區(qū)向?yàn)r青中加入劑量為1%的UV-531效果會(huì)更好;抗紫外光添加劑應(yīng)采用高速剪切機(jī)與瀝青拌合,拌合溫度建議選擇160℃,攪拌時(shí)間不少于20min。(2)瀝青砂涂層可以提高瀝青混凝土的抗紫外光老化能力,但是涂層厚度不宜過(guò)后,以基本完全填充路表面空隙為最好,建議理論厚度為2mm,高溫方面瀝青砂設(shè)計(jì)級(jí)配LS3效果最好,低溫方面瀝青砂設(shè)計(jì)級(jí)配LS2效果最好,兩種設(shè)計(jì)級(jí)配說(shuō)明瀝青砂涂層設(shè)計(jì)中適當(dāng)提高粒徑較大集料的比例效果會(huì)更好。
[Abstract]:The research on the ultraviolet aging resistance of asphalt and its mixture is in the developing stage. At present, the anti-ultraviolet light additive is mainly added to the asphalt to improve the anti-UV aging performance of asphalt and asphalt mixture.However, there are many kinds of anti-ultraviolet light additives, and most of them are only aimed at the study of the anti-UV aging performance of asphalt by a single anti-ultraviolet light additive.However, there is little research on the anti-UV aging performance of asphalt and its mixture.Therefore, it is necessary to search for a suitable compound type of UV-resistant additives and to study the improvement of UV aging resistance of asphalt and its mixture.In this paper, three kinds of UV-531TiO2-SiO2 anti-UV additives are selected. Firstly, the effects of single anti-UV additives and various kinds of anti-UV additives on the anti-UV aging performance of asphalt and asphalt mixture are compared and analyzed.In order to determine the best type and dosage of anti-ultraviolet light additives, the structure of road surface with various anti-UV additives in the upper layer was simulated and calculated by ABAQUS finite element software.In order to explain the improvement effect of the UV light resistant additive on the mechanical properties of the road structure aged by ultraviolet light, the asphalt sand coating was designed, and the UV light resistant additive was added to the asphalt sand according to the optimum dosage.The high and low temperature performance tests of asphalt mixture specimens with or without coating were carried out after UV aging.The effect of asphalt sand coating with different gradation and thickness on the UV aging resistance of asphalt concrete pavement is explained by comparison and analysis, in order to determine the effect of asphalt sand coating on the UV aging resistance of asphalt pavement.The conclusion is as follows: (1) the composite UV additive has a better effect on improving the UV aging resistance of asphalt and asphalt mixture. The compound type is UV-531 TIO _ 2, and the ratio is 1: 2.5, but the annual average temperature is low.It would be better to add 1% UV-531 to the asphalt in the region with weak ultraviolet radiation, and the anti-UV additive should be mixed with asphalt by high speed shearing machine, and the mixing temperature should be 160C.Agitating time is not less than 20 min. 2) Asphalt sand coating can improve the anti-UV aging ability of asphalt concrete, but the coating thickness should not be later, and the best one is to fill the gap of road surface completely.It is suggested that the theoretical thickness is 2 mm, the LS3 effect of asphalt sand design grade is the best in high temperature, and the best effect is asphalt sand design grade LS2 in low temperature. It is better to increase the proportion of large particle size aggregate in the design of asphalt sand coating with two design grades.
【學(xué)位授予單位】：西安建筑科技大學(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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本文編號(hào)：1715151