【摘要】：隨著社會經(jīng)濟的迅速發(fā)展,汽車保有量急劇增加,因此產(chǎn)生了大量廢舊輪胎,造成了“黑色污染”。為了解決廢料的處理問題,最值得關(guān)注的就是回收利用。將廢舊輪胎變廢為寶,添加到瀝青中改性瀝青,處理掉部分廢舊輪胎的同時,還能夠改善瀝青路面的各項路用性能。然而單純地將廢輪胎生產(chǎn)成膠粉加入到瀝青中,會產(chǎn)生了諸多問題,制約了橡膠瀝青的發(fā)展,如生產(chǎn)溫度過高瀝青老化、施工性能和施工環(huán)境問題、耐久性能問題等。SMA骨料結(jié)構(gòu)具有優(yōu)異的抵抗變形能力、抗滑降噪、防止水霧現(xiàn)象、提高能見度、延長路面使用壽命以及良好的低溫抗裂性能。但是目前一般都采用SBS改性瀝青,大大提高了筑路成本,因此找到一種既能降低成本又能提高道路使用性能的材料代替之,是市場發(fā)展的需求。為此,本論文采用HCG型裂解劑對廢輪胎粉瀝青進行改性,希望能夠配制出性能優(yōu)良的膠粉瀝青混合料,推廣廢輪胎粉改性瀝青混合料,指導(dǎo)工程應(yīng)用。論文采用針入度、延度、軟化點、旋轉(zhuǎn)粘度作為評價指標研究廢輪胎粉改性瀝青的技術(shù)性能,并與未添加裂解劑的廢輪胎粉瀝青進行對比研究,采用濕法工藝研究廢輪胎膠粉的摻量、裂解劑的摻量和裂解時間這三大因素的變化對廢輪胎粉瀝青技術(shù)性質(zhì)的影響,并得到研究范圍內(nèi)廢輪胎粉改性瀝青的最佳配比。論文對廢輪胎粉改性瀝青混合料的性能進行了研究。文中以70#瀝青中加入20%膠粉、4‰裂解劑、裂解2h的配比制作廢輪胎粉改性瀝青。選定SMA-13級配作為混合料結(jié)構(gòu),對廢輪胎粉改性SMA瀝青混合料進行路用性能研究。研究內(nèi)容包括混合料的高低溫性能、水穩(wěn)定性和疲勞特性。試驗結(jié)果表明:廢輪胎粉改性SMA瀝青-13混合料的綜合路用性能更加優(yōu)越;水穩(wěn)定性能有顯著提高,高溫穩(wěn)定性能提升幅度更大但略低于未加裂解劑的廢輪胎粉瀝青混合料,疲勞性能和低溫性能略高于未加裂解劑的廢輪胎粉SMA瀝青混合料。廢輪胎粉改性SMA瀝青混合料更適用于工程實踐,其工作性也比較優(yōu)良。
[Abstract]:With the rapid development of social economy, the number of cars has increased rapidly, so a large number of waste tires have been produced, which has caused "black pollution". In order to solve the waste disposal problem, the most worthy of attention is recycling. When the waste tire is changed into a treasure, the modified asphalt is added to the asphalt, and some of the waste tires are treated. At the same time, the road performance of the asphalt pavement can also be improved. However, simply adding rubber powder from waste tires to asphalt will cause many problems, which will restrict the development of rubber asphalt, such as aging of asphalt at high production temperature, construction performance and construction environment problems. SMA aggregate structure has excellent resistance to deformation, anti-sliding and noise reduction, preventing water mist phenomenon, improving visibility, prolonging pavement service life and good low temperature crack resistance. However, at present, SBS modified asphalt is generally used, which greatly increases the cost of road construction. Therefore, it is the demand of market development to find a material that can reduce the cost and improve the performance of the road. Therefore, this paper uses HCG pyrolysis agent to modify the waste tire powder asphalt, hoping to prepare the rubber powder asphalt mixture with good performance, popularize the waste tire powder modified asphalt mixture, and guide the engineering application. In this paper, penetration, ductility, softening point and rotational viscosity are used as evaluation indexes to study the technical performance of waste tire powder modified asphalt, and to compare it with waste tire powder asphalt without pyrolysis agent. The effects of three factors, such as the content of waste tire powder, the amount of pyrolysis agent and the pyrolysis time, on the technical properties of waste tire powder asphalt were studied by wet process, and the optimum proportion of waste tire powder modified asphalt was obtained. The performance of waste tire powder modified asphalt mixture is studied in this paper. The modified asphalt of waste tire powder was prepared by adding 20% rubber powder, 4 鈥，

本文編號：2365098