| 测量加筋沥青混凝土内的裂缝扩展 |
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| 引用本文： | 郑传超.测量加筋沥青混凝土内的裂缝扩展[J].东南大学学报,2005,21(3):342-347. |
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| 作者姓名： | 郑传超 |
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| 作者单位： | 长安大学特殊地区公路工程教育部重点实验室,西安710064 |
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| 摘 要： | 利用2种不同的方法加筋沥青罩面:①在沥青混合料中加入短切玻璃纤维改善沥青混凝土的特性,②采用玻璃格珊加筋沥青混凝土.应用断裂力学方法分析沥青路面裂缝扩展机理.采用沥青混合料设计试验、三点弯曲试验和疲劳裂缝扩展试验,确定加筋沥青混凝土的临界应力强度因子KIC,测量每一种沥青罩面抗裂系统的裂缝扩展速率.本研究的主要特点是提出复合型抗裂罩面系统,分析了多层加筋沥青罩面裂缝扩展过程,推荐了若干沥青路面抗裂系统.结果证明,加筋材料可以提高沥青罩面的抗裂特性,复合型抗裂罩面系统能够有效地阻止反射裂缝的扩展.
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| 关 键 词： | 道路工程 热拌沥青混和料(HMA) 裂缝扩展 断裂力学 临界应力强度因子 |
| 收稿时间： | 03 1 2005 12:00AM |
Measuring crack propagation in reinforced asphalt concretes |
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| Aysar Najd,Aysar Najd,Zheng Chuanchao.Measuring crack propagation in reinforced asphalt concretes[J].Journal of Southeast University(English Edition),2005,21(3):342-347. |
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| Authors: | Aysar Najd Aysar Najd Zheng Chuanchao |
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| Abstract: | Two different reinforcing methodologies are applied:modification of the overlay characteristics by adding chopped glass fibers to the hot mixture asphalt (HMA) and reinforcing asphalt overlay with glass grids.Theory of fracture mechanics (FM) is employed to determine crack growth rates for the suggested anti-cracking overlay systems.Asphalt mixture designing tests,three point bending tests and fatigue crack propagation tests were carried out.The critical stress intensity factors K_(IC) are determined for plain and reinforced asphalt concrete.Depending on the fatigue crack propagation,the crack growth rate is determined for each type of anti-cracking system and the cracking process is also analyzed.One of the significant points in this study is the attempt to give better understanding of the crack propagation for multilayer asphaltic overlay or what are suggested herein to be called composite structure anti-cracking overlay system.The results indicate that the reinforcing materials improve anti-cracking characteristics of the asphalt concrete.Composite structure anti-cracking overlay gives a good solution for the reflective cracking phenomenon over old cracked pavements. |
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| Keywords: | highway engineering hot mixture asphalt (HMA) crack propagation fracture mechanics critical stress intensity factor |
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