[1]王杰,秦永春,曾蔚,等.厂拌热再生SBS改性沥青混合料抗裂性能[J].长安大学学报(自然科学版),2019,39(04):27-34.
　WANG Jie,QIN Yong chun,ZENG Wei,et al.Crack resistance of mixture with reclaimed SBS modified asphalt pavement from central mixing plant[J].Journal of Chang’an University (Natural Science Edition),2019,39(04):27-34.
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厂拌热再生SBS改性沥青混合料抗裂性能()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第39卷
期数:
2019年04期
页码:
27-34
栏目:
道路工程
出版日期:
2019-07-15

文章信息/Info

Title:
Crack resistance of mixture with reclaimed SBS modified asphalt pavement from central mixing plant
作者:
王杰; 秦永春; 曾蔚; 黄颂昌; 徐剑
（交通运输部公路科学研究院 道路结构与材料交通行业重点实验室（北京），北京 100088）
Author(s):
WANG Jie;  QIN Yongchun;  ZENG Wei;  HUANG Songchang;  XU Jian
(Key Laboratory of Road Structure & Material of Ministry of Transport (Beijing), Research Institute of Highway of Ministry of Transport, Beijing 100088, China)
关键词:
道路工程; 再生SBS改性沥青混合料; 断裂能; 数字散斑技术; 长期老化; 冻融循环
Keywords:
road engineering;  recycled SBS modified asphalt mixture;  fracture energy;  digital speckle correlation technique;  long term aging;  freezethaw cycle
文献标志码:
A
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。
Abstract:
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. 〖JP2〗The damage degree can be divided into two stages, a rapid damage period and a stable damage period. 10 tabs, 9 figs, 17 refs.

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更新日期/Last Update: 2019-07-29