發(fā)布時間：2018-03-18 03:34

  本文選題：道路工程　切入點：廢機油底渣(WEOB)　出處：《建筑材料學(xué)報》2017年04期 　論文類型：期刊論文

【摘要】：為準確預(yù)估廢機油底渣(WEOB)對瀝青長期耐久性的影響,通過在直餾瀝青中添加不同用量的廢機油底渣來制備改性瀝青,并對改性瀝青進行不同程度的老化:旋轉(zhuǎn)薄膜烘箱老化(RTFO),壓力箱老化(PAV)及擴展壓力箱老化(ExPAV).采用雙邊缺口拉伸(DENT)試驗的臨界裂紋張開位移(CTOD)研究瀝青的抗延性斷裂性能,采用擴展彎曲梁流變(Ex-BBR)試驗得到的分級損失來評估物理硬化對瀝青低溫可靠性的影響,采用ΔTc指標(蠕變勁度臨界溫度與蠕變速率臨界溫度之差)評估瀝青的長期耐久性,此外通過原子力顯微鏡(AFM)觀察添加WEOB前后瀝青的微觀結(jié)構(gòu)形態(tài).結(jié)果表明:延長老化時間(ExPAV)可以更明顯識別WEOB對瀝青低溫性能的不利影響,而常規(guī)瀝青老化時間(PAV)并不能明顯捕捉這種不利影響;添加WEOB會使瀝青產(chǎn)生物理硬化并導(dǎo)致抗延性斷裂性能降低;WEOB可使瀝青中蠟晶粒明顯增加,而蠟晶粒的低溫結(jié)晶及其相界造成的應(yīng)力集中是導(dǎo)致廢機油底渣長期低溫性能降低的主要原因.
[Abstract]:In order to accurately estimate the effect of waste oil bottom slag on the long-term durability of asphalt, modified asphalt was prepared by adding waste oil bottom slag with different dosage in straight-run asphalt. At the same time, the aging of modified asphalt was carried out to varying degrees: rotative film oven aging (RTFOO), pressure chamber aging (PAV) and expanded pressure chamber aging (ExPAV). The critical crack opening displacement (CTODD) of two-sided notched tensile test was used to study the ductile fracture properties of asphalt. The influence of physical hardening on the low temperature reliability of asphalt was evaluated by using the graded loss obtained from the Ex-BBRs test of extended bending beam, and the long term durability of asphalt was evaluated by 螖 Tc index (the difference between the critical temperature of creep stiffness and the critical temperature of creep rate). In addition, atomic force microscopy (AFM) was used to observe the microstructure and morphology of asphalt before and after adding WEOB. The results showed that the adverse effect of WEOB on the low temperature performance of asphalt could be recognized more obviously by prolonging the aging time. However, the aging time of conventional asphalt (WEOB) can not obviously capture this adverse effect. Adding WEOB can lead to physical hardening of asphalt and decrease of ductile fracture resistance. WEOB can obviously increase the grain size of wax in asphalt. The low temperature crystallization of wax grain and the stress concentration caused by the phase boundary are the main reasons for the long-term low temperature performance of the waste oil bottom slag.
【作者單位】： 西南交通大學(xué)土木工程學(xué)院;西南交通大學(xué)道路工程四川省重點實驗室;加拿大女王大學(xué)化學(xué)學(xué)院;西華大學(xué)土木建筑與環(huán)境學(xué)院;四川高速公路建設(shè)開發(fā)總公司;
【基金】：綠色建筑與節(jié)能四川省重點實驗室開放課題項目(szjj2015-074) 國家留學(xué)基金委公派留學(xué)基金項目(201607000097)
【分類號】：U414

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本文編號：1627848