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首页> 外文期刊>American Journal of Traffic and Transportation Engineering >Impact of Repeated Load on Crack Healing Cycles of Asphalt Concrete
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Impact of Repeated Load on Crack Healing Cycles of Asphalt Concrete

机译：反复荷载对沥青混凝土裂缝愈合周期的影响

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Asphalt concrete pavement is designed to under take repeated loading for its design life with minimal maintenane requirements. Under such loading mode, micro cracks appears in the flexible pavement structure, while it exhibit self healing ability of micro cracks. In this work, the impact of repeated tensile and shear stresses on accumulation of permanent strain of asphalt concrete and micro crack healing cycles have been investigated. Asphalt concrete specimens of 100 mm diameter and 63 mm height have been prepared with optimum asphalt requirement and with extra 0.5% asphalt above and below the optimum. Specimens exhibits permamemt strain under repeated tensile and shear stresses using three stress levels (69, 138 and 207) kPa at 25℃ environment. The loading cycle consists of load repetitions application for 0.1 second followed by 0.9 seconds of rest period. Specimens were allowed to heal by external heating at 60℃ for 120 minutes after each 1000 load repetitions, then subjected to another load repetition cycles. The healing cycle was repeated twice. It was concluded that as the crack healing cycles proceeds, the resilient modulus increases while the permanent strain decreases. The impact of asphalt content on resilient modulus is variable through the crack healing cycles among tensile and shear stresses. After crack healing cycles, the permanent strain was reduced by an average of (45, 36 and 23)%, for (69, 138, and 207) kPa respectively as compared to reference mix under punching shear stress (PSS), while it was reduced by an average of (5, 23 and 21)%, for (69, 138, and 207) kPa respectively as compared to reference mix under indirect tensile stress (ITS).
机译：沥青混凝土路面的设计寿命是在反复承受荷载的情况下，对Maintenane的要求最小。在这种加载模式下，柔性路面结构中会出现微裂纹，同时表现出微裂纹的自愈能力。在这项工作中，已经研究了反复的拉伸和剪切应力对沥青混凝土永久应变累积和微裂纹愈合周期的影响。制备了直径为100毫米，高度为63毫米的沥青混凝土标本，要求有最佳的沥青要求，并在最佳值以上和以下分别添加0.5％的沥青。在25℃的环境中，使用三种应力水平（69、138和207）kPa，样品在重复的拉伸和剪切应力下会表现出永久应变。加载周期包括0.1秒钟的重复加载应用程序，然后是0.9秒钟的休息时间。每重复1000次负载后，通过在60℃外部加热120分钟使标本愈合，然后进行另一个负载重复循环。愈合周期重复两次。结论是，随着裂纹愈合周期的进行，弹性模量增加，而永久应变减小。沥青含量对弹性模量的影响可通过在拉应力和剪应力之间的裂缝愈合循环而变化。在裂纹愈合周期之后，与冲压冲剪应力（PSS）的参考混合物相比，永久应变平均降低了（45、36和23）％，分别为（69、138和207）kPa。与间接拉伸应力（ITS）下的参考混合物相比，分别降低了（69、138和207）kPa的平均（5、23和21）％。

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