低水泥剂量稳定级配碎石基层材料收缩性能研究

发布时间：2018-08-27 14:00

【摘要】：伴随着我国高速公路的跨越式发展,半刚性基层沥青路面以其承载力高、造价低的优势,成为了我国高等级公路沥青路面的主流结构型式。然而,半刚性基层易出现干缩和温缩裂缝,进而反射到面层形成反射裂缝。路面裂缝不仅会降低路面的整体平整度,而且会导致水分渗入路面结构而得不到及时排出,这样就会进一步降低基层的强度。但是到目前为止,仍没有找到阻止半刚性基层沥青路面裂缝产生的有效方法。近年来我国许多学者提出用采用级配碎石基层代替半刚性基层,从而减少反射裂缝的产生,但是级配碎石基层虽然能够有效的减少反射裂缝；但由于其自身强度、刚度不足的特点,导致其只能应用在低等级或轻交通的道路中,无法广泛应用。低水泥剂量稳定级配碎石基层是介于半刚性基层和柔性基层之间的一种结构形式,通过降低混合料中水泥的掺量,进而减小其收缩系数,增强混合料的抗裂性能。使混合料在满足强度要求的前提下,增强其抗收缩能力,进而减少裂缝的产生和传递。低水泥剂量稳定级配碎石基层不但会有效的减少反射裂缝的产生,同时由于掺入了少量水泥,其强度会优于级配碎石基层,解决级配碎石基层沥青路面刚度低、适应重载交通能力差的问题。本文第一章绪论,说明了课题研究的意义、国内外研究现状和研究内容。第二、三、四、五章分别对低水泥剂量稳定级配碎石的材料强度及配合比试验,混合料的收缩机理,收缩试验和收缩性能进行分析。第六章对低水泥剂量稳定级配碎石的抗裂性能进行综合评价。第七章通过ABAQUS有限元软件,分析低水泥剂量稳定级配碎石抑制反射裂缝的效果。第八章提供了实体工程试验路施工配合比及现场检测的情况。第九章总结了论文研究的主要结论,同时提出了需要进一步研究的建议。
[Abstract]:With the rapid development of expressway in our country, semi-rigid base asphalt pavement has become the mainstream structure of high grade highway asphalt pavement because of its advantages of high bearing capacity and low cost. However, the semi-rigid base is prone to dry shrinkage and temperature shrinkage cracks, and then reflect to the surface to form reflection cracks. Pavement cracks will not only reduce the overall smoothness of the road surface, but also lead to the infiltration of water into the pavement structure without timely discharge, which will further reduce the strength of the base course. But up to now, there is no effective method to prevent the crack of semi-rigid base asphalt pavement. In recent years, many scholars in our country have proposed to use graded crushed stone base instead of semi-rigid base, so as to reduce the occurrence of reflective cracks, but gradation gravel base can effectively reduce the reflection crack, but because of its own strength, Due to the lack of stiffness, it can only be used in low-grade or light traffic roads, and cannot be widely used. Low cement dosage stabilized graded crushed stone base is a kind of structure form between semi-rigid base and flexible base. By reducing the content of cement in the mixture, and then reducing its shrinkage coefficient, the crack resistance of the mixture is enhanced. On the premise of meeting the requirements of strength, the mixture can enhance its ability to resist shrinkage, and then reduce the generation and transmission of cracks. Low cement dose stabilized graded crushed stone base will not only effectively reduce the occurrence of reflection cracks, but also because of the addition of a small amount of cement, its strength will be better than graded crushed stone base, so that the asphalt pavement stiffness of graded gravel base is low. Adapt to the problem of poor traffic capacity. The first chapter introduces the significance of the research, domestic and international research status and research content. In the second, third, fourth and fifth chapters, the strength and compounding ratio test, shrinkage mechanism, shrinkage test and shrinkage performance of low cement dosage stabilized graded macadam are analyzed respectively. In chapter 6, the crack resistance of low-dose stable graded macadam is evaluated. In chapter 7, ABAQUS finite element software is used to analyze the effect of reducing reflection crack of low cement dosage stabilized grained macadam. The eighth chapter provides the concrete engineering test road construction mix ratio and the spot inspection situation. Chapter 9 summarizes the main conclusions of the thesis and puts forward some suggestions for further study.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414;U416.214

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