SAC13瀝青混合料動態(tài)模量梯形梁試驗研究
發(fā)布時間：2018-08-20 18:53
【摘要】：選用70~#基質(zhì)瀝青和SBS改性瀝青設(shè)計了兩種SAC13瀝青混合料,使用梯形梁試驗方法進行了動態(tài)模量試驗研究,考察了瀝青材料和荷載水平對動態(tài)模量及相位角的影響。基于時溫等效原理,計算了主曲線移位因子,繪制了動態(tài)模量和相位角主曲線,分析了瀝青混合料的動態(tài)力學性能和黏彈性能;利用非線性數(shù)值回歸得到了動態(tài)模量三維主曲面。結(jié)果表明:主曲線能夠較為全面地反映瀝青混合料的動力學性能,通過改善瀝青材料性能可以提高瀝青混合料的路用性能;在兩點加載模式下,隨著應變水平的增加,動態(tài)模量減小,相位角增大;應變水平對動態(tài)模量和相位角的影響并非恒定,在高溫(低頻)時,應變水平的影響更加顯著;超載會顯著加速路面損壞,不僅僅因為荷載超過了路面承載力,而且因為荷載水平的增加降低了路面結(jié)構(gòu)本身的力學性能。
[Abstract]:Two kinds of SAC13 asphalt mixture were designed by using 70 # matrix asphalt and SBS modified asphalt. The dynamic modulus of asphalt mixture was studied by trapezoid beam test method. The influence of asphalt material and load level on dynamic modulus and phase angle was investigated. Based on the principle of time-temperature equivalence, the shift factor of the main curve is calculated, the main curves of dynamic modulus and phase angle are drawn, and the dynamic mechanical properties and viscoelastic properties of asphalt mixture are analyzed. Three dimensional principal surface of dynamic modulus is obtained by nonlinear numerical regression. The results show that the main curve can fully reflect the dynamic performance of asphalt mixture, and the pavement performance of asphalt mixture can be improved by improving the performance of asphalt mixture, and under the two-point loading mode, with the increase of strain level, the road performance of asphalt mixture can be improved by improving the performance of asphalt mixture. The influence of strain level on dynamic modulus and phase angle is not constant, especially at high temperature (low frequency). Not only the load exceeds the bearing capacity of the pavement, but also the mechanical properties of the pavement structure are reduced by the increase of the load level.
【作者單位】： 長沙理工大學道路結(jié)構(gòu)與材料交通行業(yè)重點實驗室;長沙理工大學交通運輸工程學院;交通運輸部公路科學研究院;
【基金】：國家自然科學基金項目(51678078) 長沙理工大學道路結(jié)構(gòu)與材料交通行業(yè)重點實驗室開放基金項目(kfj150304)
【分類號】：U414
[Abstract]:Two kinds of SAC13 asphalt mixture were designed by using 70 # matrix asphalt and SBS modified asphalt. The dynamic modulus of asphalt mixture was studied by trapezoid beam test method. The influence of asphalt material and load level on dynamic modulus and phase angle was investigated. Based on the principle of time-temperature equivalence, the shift factor of the main curve is calculated, the main curves of dynamic modulus and phase angle are drawn, and the dynamic mechanical properties and viscoelastic properties of asphalt mixture are analyzed. Three dimensional principal surface of dynamic modulus is obtained by nonlinear numerical regression. The results show that the main curve can fully reflect the dynamic performance of asphalt mixture, and the pavement performance of asphalt mixture can be improved by improving the performance of asphalt mixture, and under the two-point loading mode, with the increase of strain level, the road performance of asphalt mixture can be improved by improving the performance of asphalt mixture. The influence of strain level on dynamic modulus and phase angle is not constant, especially at high temperature (low frequency). Not only the load exceeds the bearing capacity of the pavement, but also the mechanical properties of the pavement structure are reduced by the increase of the load level.
【作者單位】： 長沙理工大學道路結(jié)構(gòu)與材料交通行業(yè)重點實驗室;長沙理工大學交通運輸工程學院;交通運輸部公路科學研究院;
【基金】：國家自然科學基金項目(51678078) 長沙理工大學道路結(jié)構(gòu)與材料交通行業(yè)重點實驗室開放基金項目(kfj150304)
【分類號】：U414
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