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Crack resistance of mixture with reclaimed SBS modified asphalt pavement from central mixing plant(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2019年04期
Page:
27-34
Research Field:
道路工程
Publishing date:

Info

Title:
Crack resistance of mixture with reclaimed SBS modified asphalt pavement from central mixing plant
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)
Keywords:
road engineering;  recycled SBS modified asphalt mixture;  fracture energy;  digital speckle correlation technique;  long term aging;  freezethaw cycle
PACS:
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DOI:
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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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Last Update: 2019-07-29