本文選題：道路工程 + 瀝青��； 參考：《建筑材料學(xué)報》2017年05期

【摘要】：利用加入間歇時間的動態(tài)剪切流變試驗(yàn),研究了瀝青自愈合行為的影響因素及其評價方法.通過試驗(yàn)得到70#基質(zhì)瀝青和SBS I-C改性瀝青在4種間歇時間、3種應(yīng)變水平下的疲勞壽命,并采用能量耗散理論分析了試驗(yàn)過程,得到了耗散能變化率的坪值PV.根據(jù)坪值PV與間歇時間的關(guān)系,定義了不受間歇時間影響的評價指標(biāo)自愈合速率HR,并采用自愈合率HI及自愈合速率HR評價了2種瀝青在不同條件下的自愈合性能.研究發(fā)現(xiàn):2種瀝青的HI值均隨間歇時間的增大而提高;HI及HR值均隨著應(yīng)變水平的增大而減小;SBS I-C改性瀝青的自愈合指標(biāo)優(yōu)于70#基質(zhì)瀝青.
[Abstract]:The influence factors of asphalt self-healing behavior and its evaluation method were studied by dynamic shear rheological test. The fatigue life of 70# base asphalt and SBS I-C modified asphalt under four different strain levels were obtained by experiments. The test process was analyzed by energy dissipation theory, and the plateau PVR of dissipation energy change rate was obtained. According to the relationship between the plateau PV and the intermittent time, the self-healing rate HRR, which is not affected by the intermittent time, is defined, and the self-healing performance of the two kinds of asphalt under different conditions is evaluated by using the self-healing rate HI and the self-healing rate HR. It was found that the HI value of two kinds of asphalt increased with the increase of intermittent time and the HR value decreased with the increase of strain level. The self-healing index of SBS I-C modified asphalt was better than that of 70# base asphalt.
【作者單位】： 武漢科技大學(xué)汽車與交通工程學(xué)院;華中科技大學(xué)土木工程與力學(xué)學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51508428)
【分類號】：U414
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本文編號：2117297