Two Ways of Closing Cracks on Asphalt Concrete Pavements: Microcapsules and Induction Heating
Two Ways of Closing Cracks on Asphalt Concrete Pavements: Microcapsules and Induction Heating
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DOI：
10.4028/www.scientific.net/kem.417-418.573
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
Alvaro Garcia;E. Schlangen;M. V. D. van de Ven
中科院分区：
文献类型：
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作者：
Alvaro Garcia;E. Schlangen;M. V. D. van de Ven
众所周知，沥青混凝土是一种自愈合材料：裂缝的两个面接触后，分子立即开始从一个面扩散到另一个面。如果没有更多的负载，这个过程会发生，直到裂纹完全消失，材料恢复其原始电阻[1]。为了提高这种愈合率，提出了两种方法。第一种是被动的自我修复机制。粘合剂中使用了嵌入式封装化学品。当由于老化和累积损伤的组合而在粘合剂中开始出现微裂纹时，它们会破坏胶囊，并且化学品通过扩散进入粘合剂。这些化学物质修复材料，降低硬度，提高沥青的愈合速度。第二种方法利用了主动的自我修复机制。材料内部的局部加热用于修复粘合剂并再次改善性能。这是通过向粘合剂中添加导电颗粒并使用感应能量来提高温度来实现的。这些方法在沥青工业中是一个相当新的概念。
It is well known that asphalt concrete is a self healing material: immediately after both faces of a crack are in contact, the diffusion of molecules from one face to the other starts. If there are no more loads, this process takes place until the crack has completely disappeared and the material has recovered its original resistance [1]. To increase this healing rate two methods are proposed. The first one is a passive self-healing mechanism. Embedded encapsulated chemicals are used in the binder. When microcracks start appearing in the binder due to the combination of ageing and accumulated damage, they break the capsules and the chemicals enter the binder by diffusion. These chemicals repair the material, decreasing the stiffness and increasing the healing rates of bitumen. The second approach makes use of an active self healing mechanism. Local heating inside the material is used to repair the binder and to improve the properties again. This is realized by adding conductive particles to the binder and using induction energy to increase the temperature. These methods are a fairly new concept in the asphalt industry.