厂拌热再生SBS改性沥青混合料抗裂性能
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摘要
为了研究厂拌热再生SBS改性沥青混合料的抗裂性能,采用半圆弯拉试验,通过断裂能分析中低温条件下旧料掺量、再生剂掺量对再生沥青混合料抗裂性能的影响;同时借助数字散斑技术,对半圆弯拉试验加载全过程中试件表面图像进行散斑处理,对其裂缝尖端水平应变场信息以及裂缝扩展特征进行评价,对比分析水平应变-时间曲线的变化规律;并研究长期老化和冻融循环作用对再生沥青混合料抗裂性能的衰减特性。研究结果表明:中低温条件下,再生沥青混合料的抗裂性能随旧料掺量的增加呈二次多项式递减,使用再生剂无法改变这种递减关系,但有助于减缓其劣化趋势,当旧料掺量(质量分数,下同)小于30%时,再生沥青混合料抗裂性能接近新拌改性沥青混合料,但抗老化性能较差;再生沥青混合料砂浆易形成受力薄弱界面,再生剂可延长其开裂时间,并提高裂尖水平应变峰值,尤其对于大比例废旧SBS改性沥青混合料(RAP-SBS)再生改善效果更明显;影响再生沥青混合料低温抗裂性能的各因素依次为温度、旧料掺量、长期老化,其中温度的影响最显著;再生沥青混合料低温抗裂性能对冻融循环次数的敏感度随旧料掺量的增加而增大,指数模型可以较好表征再生沥青混合料低温抗裂性能随冻融循环次数的衰减状况,其损伤程度随冻融次数的增加大致分为快速损伤期和稳定损伤期2个阶段。
To study the crack resistance of a mixture with reclaimed styrene-butadiene-styrene modified asphalt pavement(RAP-SBS) from a central mixing plant, a semi-circular bending test was performed to evaluate the effect of the RAP-SBS and rejuvenating agent content on the resistance at medium and low temperatures via fracture energy. At the same time, the specimen surface image during the loading process of the test was subjected to speckle processing using a digital speckle correlation technique. The horizontal strain field at the crack tip and crack development characteristics of the recycled mixture were analyzed as well as the variation law of the horizontal strain-time curve. The effects of long-term aging and freeze-thaw cycles on the crack resistance were also analyzed. The results show that the recycled mixture crack resistance decreases in accordance with the quadratic polynomial as the RAP-SBS content increases at medium and low temperatures. The quadratic polynomial relationship cannot be changed by the rejuvenating agent, but it can help to slow the deterioration trend. When RAP-SBS content is less than 30%, the crack resistance is near that of a new mixture but the anti-aging property is poor. The mortar of the recycled mixture easily forms a weak interface and the rejuvenating agent can prolong the cracking time. The horizontal strain peak at the crack tip also increases. For a mixture with high RAP-SBS contents the improvement is more obvious. The influence degrees of low temperature crack resistance are shown in order from temperature, from reclaimed mixture content to long term aging. The influence of temperature is highly significant. The sensitivity of the low temperature recycled mixture crack resistance to the freeze-thaw cycle increases, as the RAP-SBS content increases and the exponential model can better reflect the attenuation trend between the recycled mixture crack resistance and freeze-thaw cycles. The damage degree can be divided into two stages, a rapid damage period and a stable damage period. 10 tabs, 9 figs, 17 refs.
To study the crack resistance of a mixture with reclaimed styrene-butadiene-styrene modified asphalt pavement(RAP-SBS) from a central mixing plant, a semi-circular bending test was performed to evaluate the effect of the RAP-SBS and rejuvenating agent content on the resistance at medium and low temperatures via fracture energy. At the same time, the specimen surface image during the loading process of the test was subjected to speckle processing using a digital speckle correlation technique. The horizontal strain field at the crack tip and crack development characteristics of the recycled mixture were analyzed as well as the variation law of the horizontal strain-time curve. The effects of long-term aging and freeze-thaw cycles on the crack resistance were also analyzed. The results show that the recycled mixture crack resistance decreases in accordance with the quadratic polynomial as the RAP-SBS content increases at medium and low temperatures. The quadratic polynomial relationship cannot be changed by the rejuvenating agent, but it can help to slow the deterioration trend. When RAP-SBS content is less than 30%, the crack resistance is near that of a new mixture but the anti-aging property is poor. The mortar of the recycled mixture easily forms a weak interface and the rejuvenating agent can prolong the cracking time. The horizontal strain peak at the crack tip also increases. For a mixture with high RAP-SBS contents the improvement is more obvious. The influence degrees of low temperature crack resistance are shown in order from temperature, from reclaimed mixture content to long term aging. The influence of temperature is highly significant. The sensitivity of the low temperature recycled mixture crack resistance to the freeze-thaw cycle increases, as the RAP-SBS content increases and the exponential model can better reflect the attenuation trend between the recycled mixture crack resistance and freeze-thaw cycles. The damage degree can be divided into two stages, a rapid damage period and a stable damage period. 10 tabs, 9 figs, 17 refs.
引文
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[17] 余寿文,冯西桥.损伤力学[M].北京:清华大学出版社,1997.YU Shou-wen,FENG Xi-qiao.Damage mechanics[M].Beijing:Tsinghua University Press,1997.
[2] GOLI A,ZIARI H,AMINI A.Influence of carbon nanotubes on performance properties and storage stability of SBS modified asphalt binders[J].Journal of Materials in Civil Engineering,2017,29(8):04017070.
[3] XIAO F,AMIRKHANIAN S N.Moisture susceptibility and rut resistance of RAP asphalt mixtures with high percentage of natural sand[J].Journal of Materials in Civil Engineering,2015,27(7):04014217.
[4] DONG F,YU X,XU B,et al.Comparison of high temperature performance and microstructure for foamed WMA and HMA with RAP binder[J].Construction & Building Materials,2017,134:594-601.
[5] ZAUMANIS M,MALLICK R B,POULIKAKOS L,et al.Influence of six rejuvenators on the performance properties of reclaimed asphalt pavement (RAP) binder and 100% recycled asphalt mixtures[J].Construction & Building Materials,2014,71:538-550.
[6] GHABCHI R,SINGH D,ZAMAN M,et al.Laboratory characterisation of asphalt mixes containing RAP and RAS[J].International Journal of Pavement Engineering,2016,17(9):829-846.
[7] 侯睿,黄晓明,李海军.再生工艺对热再生沥青混合料低温抗裂性能的影响[J].公路交通科技,2007,24(3):10-14.HOU Rui,HUANG Xiao-ming,LI Hai-jun.Influence of recycling technology of hot-recycled asphalt mixture's low temperature anti-cracking performance[J].Journal of Highway and Transportation Research and Development,2007,24(3):10-14.
[8] 何兆益,陈龙,陈先勇,等.厂拌热再生沥青混合料力学性能及应用研究[J].建筑材料学报,2016,19(5):871-875.HE Zhao-yi,CHEN Long,CHEN Xian-yong,et al.Mechanical properties and application research of hot recycled asphalt mixture from central mixing plant[J].Journal of Building Materials,2016,19(5):871-875.
[9] 耿九光,戴经梁,陈忠达.热再生沥青混合料低温抗裂性能全程评价[J].武汉理工大学学报:交通科学与工程版,2008,32(6):1029-1032.GENG Jiu-guang,DAI Jing-liang,CHEN Zhong-da.Whole process evaluation of low temperature anti-cracking property of hot-recycled asphalt mixture[J].Journal of Wuhan University of Technology:Transportation Science and Engineering,2008,32(6):1029-1032.
[10] SABAHFAR N,AHMED A,AZIZ S R,et al.Cracking resistance evaluation of mixtures with high percentages of reclaimed asphalt pavement[J].Journal of Materials in Civil Engineering,2016,29(4):06016022.
[11] SHU X,HUANG B,VUKOSAVLJEVIC D.Evaluation of cracking resistance of recycled asphalt mixture using semi-circular bending test[C]//TRB.Proceedings of the 2010 GeoShanghai International Conference.Washington DC:TRB,2010:58-65.
[12] 李蕊,常明丰,李彦伟,等.沥青混合料裂缝扩展过程细观力学模拟[J].交通运输工程学报,2011,11(6):1-9.LI Rui,CHANG Ming-feng,LI Yan-wei,et al.Mesomechanics simulation of micro-crack extension process for asphalt mixture[J].Journal of Traffic and Transportation Engineering,2011,11(6):1-9.
[13] ROMEO E.Two-dimensional digital image correlation for asphalt mixture characterisation:Interest and limitations[J].Road Materials & Pavement Design,2013,14(4):747-763.
[14] BUTTLAR W G,HILL B C,KIM Y R,et al.Digital image correlation techniques to investigate strain fields and cracking phenomena in asphalt materials[J].Materials & Structures,2014,47(8):1373-1390.
[15] ?ZGAN E,SERIN S.Investigation of certain engineering characteristics of asphalt concrete exposed to freeze-thaw cycles[J].Cold Regions Science & Technology,2013,85(2):131-136.
[16] 王怀文,亢一澜,谢和平.数字散斑相关方法与应用研究进展[J].力学进展,2005,35(2):195-203.WANG Huai-wen,KANG Yi-lan,XIE He-ping.Advance in digital speckle correlation method and its application[J].Advance in Mechanics,2005,35(2):195-203.
[17] 余寿文,冯西桥.损伤力学[M].北京:清华大学出版社,1997.YU Shou-wen,FENG Xi-qiao.Damage mechanics[M].Beijing:Tsinghua University Press,1997.