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Crack resistance investigation of mixtures with reclaimed SBS modified asphalt pavement using the SCB and DSCT tests

机译：用SCB和DSCT试验耐回收SBS改性沥青路面混合物的抗裂性研究

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摘要

An investigation for crack resistance of hot mix asphalt (HMA) with reclaimed SBS modified asphalt pavement (RAP-SBS) by semi-circular bending (SCB) test was conducted. The effect of RAP-SBS content and rejuvenating agent (RA) on crack resistance of recycled mixture was analyzed at medium and low temperature. Meanwhile, the horizontal strain field at crack tip and crack development characteristics of recycled mixture were analyzed by digital speckle correlation technique (DSCT). Besides, the effects of long term aging (LOTA) and freeze-thaw (F-T) cycles on the crack resistance were also analyzed. The results show that crack resistance of recycled mixture decreases in accordance with the quadratic polynomial as RAP-SBS content increases at medium and low temperature, regardless of RA. RA can significantly improve the crack resistance of mixture with high content of RAP-SBS, when RAP-SBS content is 30%, the crack resistance is close to that of virgin mixture, but the anti-aging property is poor. The mortar of recycled mixture is easy to form a weak interface, and RA can prolong the cracking time, and the horizontal strain peak at crack tip is also increased. The influence degrees of crack resistance are shown in the order from temperature, RAP-SBS content to LOTA. As RAP-SBS content increases, the sensitivity of the low temperature crack resistance to the F-T cycle increases. The exponential fitting model can express the relationship between crack resistance and F-T cycles, and the damage degree of crack resistance contains rapid damage stages and stable damage stages as F-T cycles increased. (C) 2020 Elsevier Ltd. All rights reserved.
机译：通过半圆形弯曲（SCB）试验进行了热混合沥青（HMA）与再生SBS改性沥青路面（RAP-SBS）的热混合沥青（HMA）的抗裂性研究。在培养基和低温下分析了RAP-SBS含量和恢复剂（RA）对再循环混合物抗裂性的影响。同时，通过数字斑点相关技术（DSCT）分析了再生混合物的裂纹尖端和裂纹开发特性的水平应变场。此外，还分析了长期老化（LOTA）和冻融（F-T）循环对裂纹抗性的影响。结果表明，随着RAP-SBS含量在中等和低温下增加，再循环混合物的抗裂性降低，无论RA如何。 Ra可以显着提高混合物的耐热含量高含量的RAP-SBS，当RAP-SBS含量为30％时，抗裂纹率接近原始混合物的抗衰老性能差。再循环混合物的砂浆易于形成弱界面，并且RA可以延长裂化时间，并且裂纹尖端的水平应变峰也增加。影响裂缝阻力度以从温度，RAP-SBS含量到LOTA的顺序显示。随着RAP-SBS含量的增加，低温裂纹对F-T循环的敏感性增加。指数拟合模型可以表达抗裂性和F-T循环之间的关系，并且随着F-T循环的增加，抗裂性的损坏程度含有快速损坏阶段和稳定的损坏阶段。 （c）2020 elestvier有限公司保留所有权利。

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