水泥稳定碎石基层材料微裂技术研究

发布时间：2018-06-04 13:43

本文选题：水泥稳定碎石 + 微裂　；参考：《河北工业大学》2015年硕士论文

【摘要】：水泥稳定碎石基层材料在早期养护期间往往会产生收缩裂缝,进而导致路面反射裂缝的发生,对此本文引入一种基于工程措施的预防水泥稳定类基层沥青路面反射裂缝的新技术——微裂技术。微裂技术是指水泥稳定类基层经过较短养护时期(一般为1~3d)后,让振动压路机碾压基层,产生微细裂缝网络,可避免基层材料由于自身收缩产生严重的宽或长裂缝。微裂后基层力学强度只是暂时损失,会随龄期逐渐恢复,影响其恢复能力的主要因素有混合料结构类型、水泥剂量、微裂实施时间和微裂损伤程度等。要研究微裂技术,需从不同影响因素下水稳碎石基层材料微裂后力学强度发展规律、抗收缩性能和对沥青路面结构力学行为影响等方面展开工作,本文主要对以下内容做重点研究:(1)在阐述水稳碎石基层材料微裂技术及作用机理基础上,分析了微裂技术影响因素,并提出室内微裂试验方案;同时,通过大量试验找出振动压实仪一定振动参数下水稳碎石试件在不同影响因素下微裂损伤程度与振动时间的对应关系。(2)制备微裂程度不同的试样,并对不同水泥剂量、不同微裂实施时间和不同微裂损伤程度下的试样进行无侧限抗压、劈裂抗拉、抗压回弹和收缩特性(干缩和温缩)等力学性能试验研究,分析水稳碎石材料微裂后力学强度发展过程及对基层材料收缩特性影响,并总结水稳碎石材料微裂力学变化规律。(3)根据微裂后水稳碎石基层材料力学发展规律,借助KENPAVE路面分析软件系统分析了水稳碎石基层采用微裂技术后,在标准轴载和不同轴载水平下,沥青路面结构层间最大剪应力、层底最大拉应力和路面弯沉等力学行为。(4)结合微裂技术在104国道沧州吴桥段路面结构大修工程中的应用,配合软件分析与室内试验,探讨研究内容实际应用的可能性。将试验路实测数据与软件模拟结果对照分析,为微裂技术在实际工程中的推广、应用与研究提供可靠依据。
[Abstract]:Cement stabilized macadam base materials often produce shrinkage cracks during early maintenance, which leads to the occurrence of pavement reflective cracks. In this paper, a new technique of preventing reflection crack of cement stabilized base asphalt pavement based on engineering measures, micro-crack technology, is introduced in this paper. The micro-crack technology means that after a short curing period (generally 1 ~ 3 days), the vibratory roller compacts the base course and produces a fine crack network, which can avoid the serious wide or long cracks caused by the shrinkage of the base material. The mechanical strength of the base course after microcrack is only temporary and will recover gradually with the age. The main factors affecting the recovery ability are the structure type of the mixture, cement dosage, the time of microcrack implementation and the degree of microcrack damage and so on. In order to study micro-crack technology, it is necessary to work on the development law of mechanical strength, shrinkage resistance and influence on the mechanical behavior of asphalt pavement structure after microcrack of the base material of water-stabilized crushed stone with different influencing factors. This paper mainly focuses on the following contents: (1) on the basis of expounding the micro-crack technology and mechanism of water-stabilized crushed stone base material, the influencing factors of micro-crack technology are analyzed, and the indoor micro-crack test scheme is put forward, at the same time, Through a large number of tests, we find out the corresponding relationship between the degree of micro-crack damage and the vibration time of the specimen with certain vibration parameters of the vibratory compaction meter under different influence factors. (2) the samples with different microcrack degree are prepared, and the different cement doses are obtained. The mechanical properties of the specimens with different microcracking time and damage degree were studied, such as unconfined compression, splitting tensile resistance, compressive springback and shrinkage characteristics (dry shrinkage and temperature shrinkage). This paper analyzes the development process of mechanical strength and its influence on the shrinkage characteristics of the base material after micro-crack of the water-stabilized crushed stone material, and summarizes the law of the micro-crack mechanics change of the water-stabilized crushed stone material according to the law of the mechanics development of the water-stabilized crushed stone base material after the micro-crack. With the aid of KENPAVE pavement analysis software, the maximum shear stress between layers of asphalt pavement structure is analyzed under standard axial load and different axial load levels after adopting micro-crack technology. The application of micro-crack technology in the overhauling of pavement structure of Cangzhou Wuqiao Section of National Highway 104, with the help of software analysis and indoor test, discusses the possibility of practical application of the research content. The comparison and analysis between the measured data of the test road and the simulation results of the software provide a reliable basis for the extension, application and research of the micro-crack technology in practical engineering.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.214

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