【摘要】：為了研究高溫裂解對(duì)膠粉改性瀝青低溫性能的影響,在不同加工溫度和加工時(shí)間下分別制備9組高溫裂解膠粉改性瀝青,并以不同改性瀝青樣品在甲苯中的溶解度表征膠粉的裂解程度。通過(guò)比較各樣品的5℃延度值、經(jīng)差示掃描量熱法(DSC)測(cè)試得到的玻璃化轉(zhuǎn)變溫度Tg以及低溫彎曲梁流變(BBR)試驗(yàn)在-24℃的蠕變勁度模量S,考察了加工溫度和加工時(shí)間對(duì)膠粉改性瀝青低溫性能的影響規(guī)律。研究結(jié)果表明:當(dāng)膠粉摻量(質(zhì)量分?jǐn)?shù))為30%時(shí),在230℃及250℃下加工樣品的溶解度隨加工時(shí)間的延長(zhǎng)有逐漸增大的趨勢(shì);在270℃下加工樣品時(shí),由于輕質(zhì)組分受熱劇烈揮發(fā),導(dǎo)致樣品的溶解度隨時(shí)間的延長(zhǎng)呈現(xiàn)先增大后減小的趨勢(shì);在230℃下,高溫裂解膠粉改性瀝青樣品的低溫性能隨著加工時(shí)間的延長(zhǎng)先提高后降低;在250℃及270℃下,隨著加工時(shí)間的延長(zhǎng),高溫裂解膠粉改性瀝青樣品的低溫性能逐漸降低;與傳統(tǒng)橡膠瀝青加工工藝相比,在一定的加工時(shí)間范圍內(nèi),膠粉的高溫脫硫裂解有利于進(jìn)一步提高膠粉改性瀝青的低溫性能;9組高溫裂解膠粉改性瀝青樣品中,250℃下加熱攪拌1 h的樣品低溫性能最好,其次為230℃下加熱攪拌2 h的樣品。
[Abstract]:In order to study the effect of high temperature cracking on the low temperature performance of rubber powder modified asphalt, nine groups of high temperature pyrolysis modified asphalt were prepared at different processing temperature and processing time. The solubility of different modified asphalt samples in toluene was used to characterize the cracking degree of rubber powder. The glass transition temperature (Tg) obtained by differential scanning calorimetry (DSC) and the creep stiffness modulus (S) of low temperature bending beam (BBR) at -24 鈩，

本文編號(hào)：2319864