本文選題：SBS改性瀝青 + 耦合條件�。� 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：SBS改性瀝青在自然環(huán)境及行車條件作用下性能發(fā)生嚴(yán)重劣化,使路面不再滿足使用要求。成熟的老化瀝青再生技術(shù)能為道路建設(shè)提供可循環(huán)使用的瀝青資源,研究SBS改性瀝青的老化機(jī)理能為瀝青再生提供技術(shù)參考。本文依托國家自然科學(xué)基金《熱光水耦合條件下SBS改性瀝青老化機(jī)理研究及高性能再生劑開發(fā)》開展研究。對(duì)耦合老化前后的改性瀝青進(jìn)行性能測試時(shí)發(fā)現(xiàn),改性瀝青老化后針入度減小、粘度增大、軟化點(diǎn)升高,與基質(zhì)瀝青變化規(guī)律一致。但SBS改性瀝青隨老化程度加深,其車轍因子G*/sinδ在某些時(shí)刻反而減小,這與基質(zhì)瀝青老化后抗車轍能力增強(qiáng)的規(guī)律不同。一般而言,基質(zhì)瀝青抗老化性能好,對(duì)應(yīng)的改性瀝青抗老化性能相對(duì)較好,但也受到瀝青制備及老化過程的影響。兩種類型的改性劑對(duì)改性瀝青的抗老化性影響無明顯差異。70℃溫度下,溫度在耦合老化作用中的貢獻(xiàn)率達(dá)到40%~70%,50℃溫度下溫度對(duì)老化的貢獻(xiàn)率在30%~50%之間,即溫度越高,溫度對(duì)老化的貢獻(xiàn)率越大。耦合老化后,改性瀝青中含氧官能團(tuán)羥基、羰基、亞砜基含量增加,表明瀝青老化過程中發(fā)生了氧化反應(yīng),而來源于SBS聚合物中的丁二烯基團(tuán)逐漸減少,說明聚合物出現(xiàn)降解,同時(shí)改性瀝青老化后發(fā)生結(jié)構(gòu)異化,芳香度增加,脂肪側(cè)鏈長度增加。瀝青相均分子量變大,聚合物均相分子量減小。經(jīng)綜合分析,改性瀝青耦合老化過程中主要的化學(xué)變化為氧化及分子結(jié)構(gòu)異化。以灰色關(guān)聯(lián)度法對(duì)改性瀝青的宏觀性能指標(biāo)與微觀化學(xué)結(jié)構(gòu)進(jìn)行對(duì)比分析,以羰基指數(shù)和芳香度分別代表改性瀝青耦合老化氧化和結(jié)構(gòu)異化兩個(gè)方面的老化程度,發(fā)現(xiàn)芳香度與針入度、軟化點(diǎn)、135℃粘度的關(guān)聯(lián)程度在0.7~0.8之間,羰基指數(shù)與針入度、軟化點(diǎn)、135℃粘度的關(guān)聯(lián)度在0.6~0.9之間,說明熱光耦合老化中氧化和結(jié)構(gòu)異化引起的改性瀝青性能指標(biāo)變化程度不一。
[Abstract]:The performance of SBS modified asphalt under the action of natural environment and driving conditions is seriously deteriorated, which makes the pavement no longer meet the requirements of use. Mature aging asphalt regeneration technology can provide recycled asphalt resources for road construction. The study of aging mechanism of SBS modified asphalt can provide technical reference for asphalt recycling. In this paper, the aging mechanism of SBS modified asphalt and the development of high performance regenerating agent were studied by the National Natural Science Foundation of China. It is found that the penetration, viscosity and softening point of the modified asphalt after aging are decreased and the softening point is increased, which is consistent with that of the matrix asphalt. However, the rutting factor G*/sin 未 of SBS modified asphalt decreases at some time with the increase of aging degree, which is different from the law of increasing rutting resistance of base asphalt after aging. Generally speaking, the base asphalt has good anti-aging performance, and the corresponding modified asphalt has better anti-aging performance, but it is also affected by the asphalt preparation and aging process. There is no obvious difference between the two kinds of modifiers on the aging resistance of modified asphalt. At 70 鈩，

本文編號(hào)：1910195