發(fā)布時間：2018-06-29 22:32

  本文選題：道路工程 + 骨架密實型瀝青混合料　； 參考：《中國公路學報》2017年05期

【摘要】：為了給骨架密實型瀝青混合料級配設(shè)計與優(yōu)化提供指導,使設(shè)計的瀝青混合料具有良好的抗車轍性能,針對目前瀝青混合料骨架結(jié)構(gòu)判據(jù)的不足,在分析現(xiàn)有瀝青混合料骨架結(jié)構(gòu)評價指標的基礎(chǔ)上,基于數(shù)字圖像處理技術(shù)考慮粗集料接觸特性對V_(mix)~VCA計算方法進行了優(yōu)化。通過對4種不同級配瀝青混合料中主骨架結(jié)構(gòu)細觀接觸分布特性進行了比較,對細觀定量評價指標與宏觀評價指標間的相關(guān)關(guān)系進行了分析,提出了粗集料形成較優(yōu)主骨架結(jié)構(gòu)的細觀定性和定量評價指標和標準。結(jié)果表明:考慮粗集料接觸特性,優(yōu)化的V_(mix)~VCA(I)計算方法所得值比目前經(jīng)驗計算法大15%~20%,在骨架判別時更加嚴格、合理,保證粗集料相互嵌擠形成最優(yōu)主骨架;瀝青混合料細觀定量評價指標與其宏觀評價指標有較好的相關(guān)關(guān)系,能夠表征瀝青混合料的抗車轍性能;骨架密實型瀝青混合料設(shè)計過程中通過調(diào)整級配提高平均配位數(shù)的同時降低C值,能有效改善混合料的細觀指標,使主骨架的質(zhì)量得到明顯提升,設(shè)計的瀝青混合料具有良好的抗車轍性能;粗集料形成較優(yōu)主骨架結(jié)構(gòu)的定性和定量評價標準為V_(mix)~VCA(I)≤V_(DRC)~(VCA),n1.6且C20%。
[Abstract]:In order to provide guidance for the gradation design and optimization of dense framework asphalt mixture and to make the designed asphalt mixture have good rutting resistance, aiming at the deficiency of the present framework structure criterion of asphalt mixture, On the basis of analyzing the existing evaluation indexes of asphalt mixture skeleton structure, the calculation method of V _ (mix) / VCA is optimized based on digital image processing technology considering the contact characteristics of coarse aggregate. The characteristics of meso-contact distribution of main skeleton structure in four different gradation asphalt mixtures are compared, and the correlation between meso-quantitative evaluation index and macroscopic evaluation index is analyzed. The evaluation indexes and standards of meso-qualitative and quantitative evaluation for the formation of better main skeleton structure of coarse aggregate are proposed. The results show that considering the contact characteristics of coarse aggregate, the calculated value of the optimized V _ (mix) / VCA (I) method is 15 ~ 20 larger than that of the current empirical calculation method, and it is more strict and reasonable in the determination of the skeleton, which ensures that the coarse aggregate is embedded in each other to form the optimal main skeleton. The quantitative evaluation index of asphalt mixture has a good correlation with its macroscopic evaluation index, and it can characterize the rutting resistance of asphalt mixture. In the design process of dense asphalt mixture, by adjusting the gradation and increasing the average coordination number and decreasing the C value, the mesoscopic index of the mixture can be effectively improved, and the quality of the main skeleton can be improved obviously. The asphalt mixture designed has good rutting resistance, and the qualitative and quantitative evaluation criteria for the formation of better main skeleton structure of coarse aggregate are V _ (mix) VCA (I) 鈮，

本文編號：2083628