Effect of air voids content on asphalt self-healing via induction and infrared heating
Effect of air voids content on asphalt self-healing via induction and infrared heating
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DOI：
10.1016/j.conbuildmat.2016.09.115
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发表时间：
2016-11-15
影响因子：
7.4
通讯作者：
Garcia, Alvaro
中科院分区：
文献类型：
--
作者：
Gomez-Meijide, Breixo;Ajam, Harith;Garcia, Alvaro
如果有足够的休息时间，沥青路面上的裂缝可以自愈。沥青自愈合是一种粘度相关的现象，随着材料的温度而加速。在本文中，沥青自愈合已诱导裂缝沥青梁与三个空隙含量：4.5%，13%，21%，通过暴露在不同的时间下红外辐射和感应加热。红外线加热已被用来模拟太阳辐射。结果表明，红外加热和感应加热都能完全修复沥青混合料的裂缝，但感应加热的效果集中在粘结剂上，而不是加热整个沥青混合料，因此节能效果更好。此外，已经观察到，致密的混合物获得更好的愈合与低能量，但通过它们获得的最大愈合率低于通过半致密和多孔混合物获得的愈合率。提出了一种新的愈合模型，不仅涉及表面张力，静水压力和能量耗散（包括在以前的模型），但也包括其他因素，如骨料和粘合剂之间的温差和热膨胀。(C)2016爱思唯尔有限公司版权所有
Cracks in asphalt roads can self-heal if enough resting time is allowed. Asphalt self-healing is a viscosity related phenomenon that accelerates with the temperature of the material. In the present paper, asphalt self-healing has been induced in cracked asphalt beams with three air voids contents: 4.5%, 13%, and 21%, by exposing them at various times under infrared radiation and induction heating. Infrared heating has been used to simulate solar radiation. Results show that cracks in asphalt mixture can be completely repaired by infrared and induction heating, but the last one is more energy efficient since the effect is concentrated only on the binder instead of heating the whole asphalt mixture. Moreover, it has been observed that dense mixtures obtained better healing with low energy but the maximum healing ratios obtained by them were lower than those obtained by semi-dense and porous mixtures. A new healing model was proposed involving not only surface tension, hydrostatic forces and energy dissipation (included in previous models) but also other factors, such as differential temperature between aggregates and binder and thermal expansion. (C) 2016 Elsevier Ltd. All rights reserved.