本文選題：道路工程 + 多聚磷酸��； 參考：《公路工程》2017年04期

【摘要】：為了改善高海拔高輻射寒冷區(qū)瀝青混凝土的抗老化性能,按照室內(nèi)與高寒高海拔區(qū)熱、紫外光輻射總量相等的原則進行室內(nèi)多聚磷酸改性(PPA)瀝青及其混合料模擬老化試驗,進而研究了PPA及PPA與低劑量SBS、SBR聚合物改性瀝青抗熱老化和紫外光老化性能,并將熱老化、紫外光老化后多聚磷酸改性瀝青混合料的路用性能、疲勞性能與基質(zhì)瀝青及4.5%SBS改性瀝青混合料進行了對比。試驗結(jié)果表明:PPA與聚合物改性瀝青的5℃延度指標(biāo)隨熱老化與紫外光老化時間增大而減小,抗車轍因子和軟化點均隨紫外光老化時間增加而增大,熱老化5 h后延度趨于穩(wěn)定,紫外光老化12 h后延度趨于穩(wěn)定。隨著紫外光老化時間延長,PPA及PPA復(fù)合改性瀝青混合料高溫性能呈先增大后減小的趨勢,低溫抗裂和疲勞性能隨老化時間延長呈下降趨勢,紫外光對瀝青高低溫性能的劣化作用比熱老化突出。PPA對基質(zhì)瀝青和低劑量SBS、SBR改性瀝青混合料抗紫外光老化作用改善效果顯著,PPA可作為高紫外光輻射區(qū)瀝青路面抗老化劑使用。研究成果可為拓展PPA改性瀝青及PPA與低劑量聚合物復(fù)合改性瀝青在高原高溫差、高紫外光輻射區(qū)的推廣應(yīng)用提供參考與借鑒。
[Abstract]:In order to improve the aging resistance of asphalt concrete in high altitude and high radiation cold region, the indoor polyphosphoric acid modified PPA asphalt and its mixture were simulated aging test according to the principle of equal amount of heat and ultraviolet radiation between indoor and high altitude area. Furthermore, the thermal aging and ultraviolet aging properties of PPA and PPA modified asphalt with low dose SBSN SBR polymer were studied, and the pavement performance of polyphosphoric acid modified asphalt mixture after thermal aging and ultraviolet light aging was studied. Fatigue performance was compared with base asphalt and 4.5%SBS modified asphalt mixture. The experimental results show that the ductility index of the modified asphalt at 5 鈩，

本文編號：1952499