【摘要】：為提高應力吸收層材料的抗裂性和疲勞耐久性,阻止反射裂縫的發(fā)生和發(fā)展,將橡膠粉與低密度PE進行復配,基于室內(nèi)加速加載、小梁彎曲和間接拉伸疲勞試驗研究了LDPE和橡膠粉摻量對應力吸收層混合料高溫穩(wěn)定性、低溫抗裂性和抗疲勞耐久性的影響并將其路用性能與STRATA應力吸收層混合料進行了對比。研究結果表明,相同LDPE摻量情況下,增大橡膠粉摻量復合改性瀝青旋轉黏度呈二次函數(shù)關系增大,橡膠粉和LDPE摻量對復合改性瀝青軟化點有顯著的影響,橡膠粉對LDPE改性瀝青的低溫性能有明顯的改善作用,而LDPE摻量越大復合改性瀝青低溫抗裂性越差;以軟化點≥75℃,5℃延度≥20 cm,135℃黏度≤3.5 Pa·s,25℃彈性恢復率≥65%作為判別標準優(yōu)選了五種不同復配方案,經(jīng)室內(nèi)試驗和試驗路驗證推薦最佳復配方案為6%LDPE+18%橡膠粉。研究成果可對今后同類型工程設計提供技術參考與研究思路。
[Abstract]:In order to improve the crack resistance and fatigue durability of stress-absorbing layer materials and prevent the occurrence and development of reflective cracks, rubber powder was combined with low-density PE, which was based on indoor accelerated loading. The effects of LDPE and rubber powder content on the high temperature stability, low temperature crack resistance and fatigue durability of stress-absorbing layer mixture were studied by trabecular bending and indirect tensile fatigue test. The road performance of the mixture was compared with that of STRATA stress-absorbing layer mixture. The results show that the rotational viscosity of composite modified asphalt increases with the increase of rubber powder content under the same LDPE content, and the rubber powder and LDPE content have a significant effect on the softening point of composite modified asphalt. Rubber powder can obviously improve the low temperature performance of LDPE modified asphalt, but the higher the content of LDPE is, the worse the low temperature crack resistance of modified asphalt is. With softening point 鈮，

本文編號：2175882