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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Fracture Behavior of Permeable Asphalt Mixtures with Steel Slag under Low Temperature Based on Acoustic Emission Technique
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Fracture Behavior of Permeable Asphalt Mixtures with Steel Slag under Low Temperature Based on Acoustic Emission Technique

机译：基于声发射技术的低温下渗透沥青混合物的断裂行为

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摘要

Acoustic emission (AE), as a nondestructive testing (NDT) and real-time monitoring technique, could characterize the damage evolution and fracture behavior of materials. The primary objective of this paper was to investigate the improvement mechanism of steel slag on the low-temperature fracture behavior of permeable asphalt mixtures (PAM). Firstly, steel slag coarse aggregates were used to replace basalt coarse aggregates with equal volume at different levels (0%, 25%, 50%, 75%, and 100%). Then, the low-temperature splitting test with slow loading was used to obtain steady crack growth, and the crack initiation and propagation of specimens were monitored by AE technique in real time. From the low-temperature splitting test results, SS-100 (permeable asphalt mixtures with 100% steel slag) has the optimal low-temperature cracking resistance. Therefore, the difference of fracture behavior between the control group (permeable asphalt mixtures without steel slag) and SS-100 was mainly discussed. From the AE test results, a slight bottom-up trend of sentinel function was founded in the 0.6–0.9 displacement level for SS-100, which is different from the control group. Furthermore, the fracture stages of the control group and SS-100 could be divided based on cumulative RA and cumulative AF curves. The incorporation of 100% steel slag reduced the shear events and restrained the growth of shear cracking of the specimen in the macro-crack stage. Finally, the considerable drops of three kinds of b-values in the final phase were found in the control group, but significant repeated fluctuations in SS-100. In short, the fracture behavior of PAM under low temperature was significantly improved after adding 100% steel slag.
机译：声发射（AE）作为非破坏性测试（NDT）和实时监测技术，可以表征材料的损伤演化和断裂行为。本文的主要目的是研究钢渣对渗透沥青混合物（PAM）的低温断裂行为的改进机制。首先，钢渣粗骨料用于替代玄武岩粗骨料，在不同水平（0％，25％，50％，75％和100％）中。然后，使用缓慢加载的低温分裂试验获得稳定的裂缝生长，并且通过AE技术实时监测样品的裂纹开始和传播。从低温分裂试验结果，SS-100（具有100％钢渣的渗透沥青混合物）具有最佳的低温裂解性。因此，主要讨论了对照组（无钢渣的渗透沥青混合物）和SS-100之间的断裂行为的差异。从AE测试结果中，SENTINEL功能的轻微自下而上的趋势在0.6-0.9的SS-100的位移水平中，与对照组不同。此外，控制组和SS-100的断裂阶段可以基于累积RA和累积AF曲线划分。加入100％钢渣的掺入减少了剪切事件并抑制了宏观裂纹阶段标本的剪切破裂的生长。最后，在对照组中发现了最终阶段中的三种B值的相当大的B值，但SS-100中的显着反复波动。简而言之，在加入100％钢渣后，在低温下的粉碎裂缝行为显着提高。

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