聚氨酯发泡材料处治水泥混凝土路面板底脱空的应用研究

发布时间：2018-01-13 16:10

本文关键词：聚氨酯发泡材料处治水泥混凝土路面板底脱空的应用研究　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着材料科学的发展,许多新材料逐渐在道路工程中得到了应用,新材料已经成为道路发展的重要推动力。聚氨酯发泡材料具有高膨胀、早强、防水、环保等特性,可以彻底切断水的下渗,防止唧泥病害的出现,最大限度的解决板底脱空问题。本文采用聚氨酯发泡材料,并且结合探地雷达无损检测技术,分析高聚物注浆材料和注浆技术处治板底脱空的可行性。首先,板底脱空传统的处理方法,通过贝克曼梁测试弯沉来判断板底脱空位置,然后向脱空处注入水泥浆,虽然水泥浆材来源广泛、价格低廉,但是其抗水损害能力弱、流动性比较差、温度敏感性高,从而导致此方法在处理板底脱空方面效果并不明显。发泡聚氨酯材料注入到板底脱空位置,该材料体积迅速膨胀并固化,从而填充脱空、加固松散的基层、抬升路面板。再配合上探底雷达无损检测技术,逐步形成了一套高效、快速、安全、环保的维修方法。其次,板底脱空形成最主要的原因是唧泥病害,雨水沿着路面接缝进入基层,与基层松散的细料混合,在车辆荷载的反复作用下,形成负真空水压,细料被带出路表,板底逐渐脱空,如不及时处治,会不断加重。最后,依托实体工程进行了现场注浆试验。试验结果表明,聚氨酯注浆的方法可以消除错台,注浆后路面的平整性有很大提高；其次,注浆点弯沉值总体呈减小趋势,且注浆前板底脱空严重的位置弯沉减小幅度很大；最后,雷达检测结果表明压浆能排出路面结构中的积水、处治基层松散。因此,利用聚氨酯注浆的方法处理轻微错台在道路养护实践中是可行的。
[Abstract]:With the development of material science, many new materials have been gradually applied in road engineering, new materials have become an important driving force of road development. Polyurethane foamed materials have high expansion, early strength, waterproof. The characteristics of environmental protection can completely cut off the infiltration of water, prevent the occurrence of mud diseases, and solve the problem of board bottom voids to the maximum extent. In this paper, polyurethane foaming materials are used and combined with the ground-penetrating radar nondestructive testing technology. Analyze the feasibility of polymer grouting material and grouting technology to treat the plate bottom void. Firstly, the traditional treatment method of board bottom void, through Beckman beam test deflection to determine the plate bottom void location. Then the cement slurry is injected into the void. Although the cement material is from a wide range of sources and the price is low, its water damage resistance is weak, the fluidity is poor, and the temperature sensitivity is high. As a result, the effect of this method is not obvious. Foamed polyurethane material is injected into the void position of the board bottom, and the volume of the material is rapidly expanded and solidified, thus filling the void and strengthening the loose base. The lifting road panel, combined with the technology of non-destructive detection of the upper bottom radar, has gradually formed a set of efficient, fast, safe and environmentally friendly maintenance methods. Secondly, the main reason for the formation of the bottom void is the disease of mud. The rainwater enters the base along the pavement joint, mixed with the loose fine material of the base, under the repeated action of the vehicle load, the negative vacuum water pressure is formed, the fine material is taken with the outlet table, and the board bottom is gradually emptied, such as not being treated in time. Finally, the field grouting test is carried out based on the solid engineering. The test results show that the polyurethane grouting method can eliminate the stagger, and the smoothness of the pavement after grouting is greatly improved. Secondly, the deflection value of grouting point decreases generally, and the deflection at the position where the slab bottom is seriously emptied before grouting is greatly reduced. Finally, the results of radar detection show that the pressure grouting can remove the stagnant water from the pavement structure and treat the loose base. Therefore, it is feasible to use polyurethane grouting method to deal with the slight stagger in the road maintenance practice.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U418.6;U416.216

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