【摘要】：橡膠輪胎在各種氣候條件下都具有良好的使用性能,故而將橡膠粉加入到瀝青中可以改善瀝青混合料的路用性能的作用;然而橡膠瀝青的生產(chǎn)和拌合溫度過高限制了橡膠瀝青的大范圍推廣應用,溫拌劑可以降低橡膠瀝青的生產(chǎn)和拌合溫度,在本文中以Leadcap溫拌劑為代表對有機降粘型溫拌橡膠瀝青混合料進行研究分析。本文主要研究了三方面的內(nèi)容,第一方面是溫拌橡膠瀝青的技術(shù)機理、制備工藝和瀝青性能,在瀝青性能方面通過對比溫拌橡膠瀝青老化前后針入度、軟化點、延度的試驗結(jié)果得知:橡膠粉的加入改善瀝青的耐老化性能,Leadcap溫拌劑可以改善瀝青的溫度敏感性,在軟化點和低溫延度方面具有較好的表現(xiàn);通過DSR試驗表明橡膠瀝青的高溫抗車轍能力隨膠粉摻量的增加而提升,Leadcap溫拌劑也可提高橡膠瀝青的抗車轍能力;通過不同摻量的橡膠粉和Leadcap溫拌劑的瀝青試驗可分析得:最佳橡膠粉摻量為22%(外摻)、最佳溫拌劑摻量為2.0%。第二方面內(nèi)容是橡膠瀝青混合料級配設計和溫拌橡膠瀝青混合料降溫幅度的確定,將調(diào)好級配的橡膠瀝青混合料通過旋轉(zhuǎn)壓實試驗得到在做同等壓實功的條件下溫拌橡膠瀝青混合料碾壓溫度160℃時碾壓效果最佳,溫拌橡膠瀝青混合料碾壓溫度150℃時碾壓效果最差;當滿足Superpave設計方法瀝青混合料的空隙率(Va)4%的設計要求時,Leadcap溫拌劑可使得橡膠瀝青混合料最高降溫幅度為32℃;溫拌橡膠瀝青混合量出料溫度降低25℃后,馬歇爾穩(wěn)定度有所提高的同時流值也在增加,但馬歇爾模數(shù)略有提高也就是從馬歇爾指標來說溫拌橡膠瀝青混合料降溫25℃后與橡膠瀝青混合料差別不大,可進行下一步性能驗證。第三方面的內(nèi)容是溫拌橡膠瀝青混合料的性能驗證,通過漢堡試驗、車轍試驗、凍融劈裂試驗和OT試驗驗證溫拌橡膠瀝青混合料的高溫性能、水穩(wěn)定性和抗開裂性能,通過實驗分析可得:相比較普通瀝青混合料,橡膠瀝青混合料的高溫抗車轍性能表現(xiàn)有較大提升,Leadcap溫拌劑對瀝青混合料的高溫抗車轍性能也有促進作用,相比較AC-20瀝青混合料AR-AC-20瀝青混合料水穩(wěn)定性提升8.9%,Leadcap溫拌劑對瀝青混合料的水穩(wěn)定性能有不利影響,AR-AC-20瀝青混合料抗開裂能力是AC-20的五倍。本文研究內(nèi)容可為溫拌橡膠瀝青AC-20類型瀝青混合料的膠粉和溫拌劑摻量的確定、配合比設計和性能分析提供參考的借鑒。
[Abstract]:Rubber tires have good performance in various climatic conditions, so adding rubber powder to asphalt can improve the road performance of asphalt mixture. However, the production and mixing temperature of rubber asphalt is too high, which limits the wide application of rubber asphalt, and the warm mix agent can reduce the production and mixing temperature of rubber asphalt. In this paper, the Leadcap warm-mix agent is used as the representative to study and analyze the organic viscosity-reducing warm-mixed rubber asphalt mixture. The main contents of this paper are as follows: on the one hand, the technical mechanism, preparation process and asphalt performance of warm rubber asphalt are studied. In the aspect of asphalt performance, the penetration and softening point of warm rubber asphalt are compared before and after aging. The results of ductility test show that the addition of rubber powder can improve the aging resistance of asphalt, Leadcap warm mix agent can improve the temperature sensitivity of asphalt, and it has better performance in softening point and low temperature ductility. The DSR test shows that the rutting resistance of rubber asphalt at high temperature increases with the increase of rubber powder content, and the rutting resistance of rubber asphalt can be improved by Leadcap warm mix agent. Through the asphalt test of rubber powder and Leadcap warm mix agent with different amount, it can be concluded that the optimum rubber powder content is 22% (external), and the best warm mix agent amount is 2.0%. The second aspect is the gradation design of rubber asphalt mixture and the determination of the cooling range of warm mix rubber asphalt mixture. Through the rotary compaction test, the rubber asphalt mixture with adjusted grading is obtained the best rolling effect when the rolling temperature of the mixture is 160 鈩，

本文編號：2308547