【作者】 范善才；

【导师】 凌天清； 朱济人；

【作者基本信息】 重庆交通大学 ， 土木建筑工程， 2008， 硕士

【摘要】 改革开放以来,中国公路发展速度最快,规模最大,最具活力的时期。中国长期以来一直使用半刚性基层,但是在使用过程中发现了很多问题,如车辙、冲刷、翻浆、唧泥、拥包等等,这让广大的道路工程师们不得不寻求一种基本能解决这些问题的新型基层结构,柔性基层就是在这种情况下应运而生。柔性基层具有较高的抗剪强度和抗疲劳特性,能够有效抑制和减少沥青路面反射裂缝的产生,可以减少半刚性基层的一些病害,有良好的经济效益和路用性能。论文依托广西壮族自治区交通厅项目《广西公路沥青路面实体结构技术参数的结构形式合理选定试验研究》课题,针对沥青路面柔性基层的结构设计参数展开研究。论文在参考国内外相关研究成果的基础上,选定了1种试验级配进行了优化设计;并且把半柔性路面的思想应用于路面基层,掺加水泥替代一部分矿粉,比较柔性基层及半柔性基层的优劣。通过大量的室内研究,提出了沥青稳定碎石3项设计参数,即:车辙指标,力学强度指标,以及抗剪强度指标。通过这些试验检验了柔性基层的高温稳定性,水稳定性,力学性能和抗剪强度指标。在试验方法上屏弃三轴试验测试沥青混合料的复杂方法,改用相对简单的单轴贯入法来测试沥青混合料的抗剪强度,并建立了动稳定度与抗剪强度的关系。更多还原

【Abstract】 Since China’s reform and opening, road industry in China has been developed in an amazing fast speed. Engineers developed many new ways and methods out of the problems due to old construction ways. Semi-rigid base, which was commonly used, was found leading to problems like wheel track, erosion, frost boil, slurry and lump. Engineers had to search for a new base structure, thus flexible base was developed. Flexible base base has high shear strength and anti-fatigue property. The special property could help eliminate problems we have on asphalt pavement (such as reflective crack) and semi-rigid base. The author high appreciates the property, and believes this property could bring good return on economic benefit and road research if well used. This paper, based on project Test and Research on Asphalt Pavement Technical Parameter under Communication Department of Guangxi Zhuang Autonomous Region, introduces the author’s research on structure technical parameter of asphalt pavement flexible base.The author, after studying on related research achievement both in and abroad, uses two asphalt-stabilized aggregate gradations in his research, China ATB-25 grading and Britain -25 grading. Semi-flexible pavement is introduced in the paper. The author replaces part of mine power in both gradations; compare the test result of each to see the advantages and disadvantages of flexible base. The author, based on a mass of laboratory experimental data, summarizes 3 design parameters of asphalt-stabilized aggregate: wheel track index, strength index and shear strength. The test verifies high-temperature stability, water stability, mechanic property, and shear strength index. The author uses uniaxial penetration, a simpler method other than triaxial to test the shear strength of asphalt mixture. Besides, relationship between dynamic stability and shear strength is developed.更多还原