厂拌热再生改性沥青混合料的动态黏弹特性
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摘要
为研究再生改性沥青混合料的动态黏弹特性,进行了沥青混合料性能试验(AMPT),分析了试验温度和荷载频率对再生混合料动态模量和相位角的影响规律,以及旧料掺量、再生剂和老化的作用效应,建立了动态模量主曲线.结果表明:随温度升高,不同荷载频率内,再生混合料动态模量趋于一致,而相位角呈不同的变化趋势,旧料掺量大于70%,相位角峰值消失;高温下再生混合料黏性表现充分,动态模量受加载频率影响较小;中低温时再生混合料相位角随荷载频率增大而减小,温度较高时先增大后减小,峰值及其对应的荷载频率小于新拌混合料,且随旧料掺量增加进一步减小;较宽频域内,再生混合料与新拌混合料动态模量趋于一致,与旧料掺量、再生剂及老化无关.
To investigate the dynamic viscoelastic property of recycled modified asphalt mixture,the asphalt mixture performance test( AMPT) was carried out. The effects of test temperature and loading frequency on dynamic modulus and phase angle of recycled asphalt mixture were analyzed,and the effects of RAP-SBS contents,rejuvenating agent and aging condition were also analyzed to establish master curves of dynamic modulus. The results show that with the increasing of temperature,the dynamic modulus of recycled mixtures tends to be consistent under different loading frequencies,while the phase angle is different. When the RAPSBS content is more than 70%,the phase angle peak disappears. The viscosity of recycled mixture is more significant at high temperature,and the dynamic modulus is less affected by loading frequency. The phase angle of recycled mixture is increased with the increasing of loading frequency at middle and low temperatures and is increased first with latter decreasing at high temperature. The peak and the peak loading frequency are less than these of new mixture and are decreased further with the increasing of RAP-SBS content. In the wide loading frequency range,the dynamic modulus values of recycled mixture and new mixture tend to be consistent with no effects of RAP-SBS content,rejuvenating agent and aging.
To investigate the dynamic viscoelastic property of recycled modified asphalt mixture,the asphalt mixture performance test( AMPT) was carried out. The effects of test temperature and loading frequency on dynamic modulus and phase angle of recycled asphalt mixture were analyzed,and the effects of RAP-SBS contents,rejuvenating agent and aging condition were also analyzed to establish master curves of dynamic modulus. The results show that with the increasing of temperature,the dynamic modulus of recycled mixtures tends to be consistent under different loading frequencies,while the phase angle is different. When the RAPSBS content is more than 70%,the phase angle peak disappears. The viscosity of recycled mixture is more significant at high temperature,and the dynamic modulus is less affected by loading frequency. The phase angle of recycled mixture is increased with the increasing of loading frequency at middle and low temperatures and is increased first with latter decreasing at high temperature. The peak and the peak loading frequency are less than these of new mixture and are decreased further with the increasing of RAP-SBS content. In the wide loading frequency range,the dynamic modulus values of recycled mixture and new mixture tend to be consistent with no effects of RAP-SBS content,rejuvenating agent and aging.
引文
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[2]MALLICK R B,ZAUMANIS M.Review of very highcontent reclaimed asphalt use in plant-produced pavements:state of the art[J].International Journal of Pavement Engineering,2014,16(1):39-55.
[3]薛彦卿,黄晓明.厂拌热再生沥青混合料力学性能试验研究[J].建筑材料学报,2011,14(4):507-511.XUE Y Q,HUANG X M.Experimental research on mechanical property of asphalt mixture from central plant hot recycling[J].Journal of Building Materials,2011,14(4):507-511.(in Chinese)
[4]CONG P L,LUO W H,XU P J,et al.Investigation on recycling of SBS modified asphalt binders containing fresh asphalt and rejuvenating agents[J].Construction and Building Materials,2015,91,225-231.
[5]SUN L,WANG Y,ZHANG Y.Aging mechanism and effective recycling ratio of SBS modified asphalt[J].Construction and Building Materials,2014,70(70),26-35.
[6]朱月风,张洪亮,宋彬.再生沥青混合料的黏弹性动态响应及疲劳性能[J].北京工业大学学报,2017,43(1):135-142.ZHU Y F,ZHANG H L,SONG B.Visco-elastic dynamic response property and fatigue performance of recycled asphalt mixture[J].Journal of Beijing University of Technology,2017,43(1):135-142.(in Chinese)
[7]THEMELI A,CHAILLEUX E,FARCAS F,et al.Modeling the linear viscoelastic behavior of asphaltitemodified bitumens[J].Rheologica Acta,2016(10):1-13.
[8]董雨明,谭忆秋.硬质沥青混合料的动态黏弹特性[J].公路交通科技,2015,32(6):18-24.DONG Y M,TAN Y Q.Dynamic viscoelastic property of hard grade asphalt mixture[J].Journal of Highway and Transportation Research and Development,2015,32(6):18-24.(in Chinese)
[9]WITCZAK M W,KALOUSH K,PELLINEN T,et al.Simple Performance Test for Superpave Mix Design[M].Washington,D.C.:National Academy Press,2002.
[10]KHOSRAVIFAR S,HAIDER I,AFSHARIKIA Z,et al.Application of time-temperature superposition to develop master curves of cumulative plastic strain in repeated load permanent deformation tests[J].International Journal of Pavement Engineering,2015,16(3),214-223.