基于水稳基层蜡制养护剂隔离层隔离性能的研究

发布时间：2018-11-15 16:13

【摘要】：作为常用的路面铺装类型,水泥路面在我国公路建设中得到了广泛的应用。而各种荷载等级交通的水泥路面常选用水泥稳定碎石作为其基层材料使用。水泥面板在施工时混凝土中的水泥浆会渗入基层,在面板与基层层间形成过渡层,并将面板和基层粘结在一起,形成初始不可持续的粘结状态。面板混凝土在多种因素综合作用下,割缝底端将由于应力集中而产生裂纹,裂纹不断向下扩展并最终贯穿面板。裂纹贯穿面板的瞬间产生的巨大回复力,会导致层间发生分离,进而引起三种层间基本破坏形式的发生,这将导致路面承载能力大幅降低。鉴此,避免三种层间基本破坏的发生很有必要,而阻止过渡层的产生是避免破坏发生的关键。研究证实,层间铺筑隔离材料能有效阻止过渡层的产生。相对各类型的隔离材料,蜡制养护剂有着表面润滑性能好、施工快、成本低等独特的优点,因此有必要对这种优良隔离材料的隔离性能做进一步的研究,以期在特定情况下充分发挥出其隔离特性。通过在不同构造深度的水稳碎石基层上分别喷洒不同剂量的蜡制养护剂,并在水稳碎石基层上进行摆式摩擦、层间剪切、滑动摩擦力以及法向拉拔等各项隔离性能试验,来测定各项隔离性能的指标值,进而分析喷洒蜡制养护剂后层间粘结的改善情况。试验结果表明,水泥稳定碎石基层上喷洒蜡制养护剂,能有效降低层间的粘结。一定喷洒量范围内,蜡制养护剂喷洒的越多,降低层间粘结效果就越明显。此外,论文还分析了蜡制养护剂固化成膜的过程,分析结果得知蜡制养护剂向水稳碎石基层下渗过程中,粘滞性会不断的增大。这个过程中易发生孔隙内壁成包的现象,并可能将空气包裹起来,使得更多的蜡制养护剂在基层表面成膜。结合此现象,本文提出了“延时分次”喷洒的方法去喷洒定量的蜡制养护剂,以提升隔离效果。
[Abstract]:As a common pavement type, cement pavement has been widely used in highway construction in China. Cement stabilized gravel is often used as base material for various load-grade traffic cement pavement. The cement slurry in concrete will infiltrate into the base course and form a transition layer between the face slab and the base layer during the construction, and bond the slab and the base to form the initial unsustainable bond state. Under the combined action of many factors, cracks will occur at the bottom of the slit joint due to stress concentration, and the cracks will continue to propagate downward and eventually run through the slab. The huge recovery force generated by the crack through the panel will lead to the separation of the layers and the occurrence of three basic failure forms between the layers which will lead to the reduction of the bearing capacity of the pavement. Therefore, it is necessary to avoid the basic damage between the three layers, and the key to avoid the damage is to prevent the transition layer from occurring. It has been proved that the interlayer paving and isolating material can effectively prevent the formation of the transition layer. Compared with various types of insulating materials, wax curing agents have the unique advantages of good surface lubrication, fast construction and low cost. Therefore, it is necessary to further study the isolation performance of this excellent insulating material. In order to give full play to its isolation characteristics under specific circumstances. By spraying different doses of wax curing agent on the hydraulic stabilized gravel base at different structural depths, and carrying out the experiments on the hydraulic stabilized gravel base, such as pendulum friction, interlayer shear, sliding friction force and normal drawing, etc., To determine the index value of each isolation performance, and then analyze the improvement of interlayer bond after spraying wax curing agent. The test results show that spraying wax curing agent on cement stabilized macadam base can effectively reduce interlayer bond. The more wax curing agent is sprayed, the lower the interlayer bonding effect is. In addition, the paper also analyzes the curing process of wax curing agent, and the results show that the viscosity of wax curing agent will increase continuously in the process of infiltration of wax curing agent to water stabilized crushed stone base. In this process, it is easy to wrap the inner wall of the pore, and possibly wrap the air, so that more wax curing agents are formed on the base surface. Combined with this phenomenon, this paper puts forward the method of "delay grading" spraying to spray quantitative wax curing agent in order to improve the isolation effect.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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