灌缝胶失效判别方法及自愈性研究

发布时间：2018-04-25 06:52

本文选题：灌缝胶 + 损坏评价　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：利用灌缝胶对路面裂缝进行灌缝修补,是目前我国处理路面裂缝病害最有效、简捷且广泛的维修方法。通过现场调查发现灌缝胶在服役过程中产生的一些损坏形式,在一定程度上可以自愈。如何定量地评价灌缝胶在实际使用过程中的损坏情况,同时考虑灌缝胶自愈性的影响因素,建立灌缝胶的失效判别方法,为灌缝胶损坏中难以自愈的部分提供一个必要的科学界定,将为道路养护者提供重新灌缝决策的依据,以及科学合理的灌缝胶更替时机。主要工作包括以下几点:首先,对绥满高速和珲乌高速2个调查路段上的灌缝胶开展了为期6个月的现场调查,总结得到了灌缝胶的典型损坏形式,制定了灌缝胶损坏调查指标和相应的调查方法;结合图像和数据,分析了灌缝胶的损坏发展趋势和各损坏调查指标的变化规律;综合考虑灌缝胶各损坏指标的影响,建立了不同灌缝施工工艺下的灌缝胶损坏评价模型。其次,分析得到灌缝胶各类损坏形式的产生原因及其对路面性能和灌缝胶自身性能的影响。研究表明:自然老化和路面温度应力的作用,是灌缝胶表面产生网状裂纹的主要原因;自然老化会使灌缝胶中的SBS等改性剂发生分解;自然老化会使灌缝胶的锥入度降低、软化点升高、玻璃化转变温度升高、低温拉伸性能变差,灌缝胶在使用过程中会过早开裂,密水功能遭到破坏,路面性能进一步受到影响。再次,选定了灌缝胶力学性自愈和功能性自愈的评价指标,并分析了灌缝胶的自愈性影响因素。研究表明:低温性能好的灌缝胶承载能力较强,高温性能好的灌缝胶力学性自愈能力较强;不同的灌缝胶在一定的温度下自愈一定时间后,其粘附性裂缝都能愈合,低温拉伸性能都会有不同程度的恢复;裂缝宽度越小、自愈温度越高、自愈时间越长、粘结环境越洁净,灌缝胶的自愈程度越高;自愈后的灌缝胶,其密水性能够完全恢复。最后,结合灌缝胶室内自愈试验和灌缝胶的真实服役环境,制定了灌缝胶的失效判别指标和失效判别标准,提出了灌缝胶的失效判别方法并详细介绍灌缝胶失效判别的流程。
[Abstract]:It is the most effective, simple and extensive maintenance method to repair pavement cracks by filling glue at present in our country. Through field investigation, it is found that some damage forms of seams in service can be healed to a certain extent. How to quantitatively evaluate the damage of seams in practical use, and consider the factors that affect the self-healing of the seams, and establish the failure discrimination method of the seams. This paper provides a necessary scientific definition for the difficult self-healing part of the jointing glue damage, which will provide the road maintainer with the basis for the decision of refilling joint, and the scientific and reasonable replacement time of the seams. The main work includes the following points: first of all, a six-month field investigation was carried out on the jointed glue in Sui-Man Expressway and Huiwu Expressway, and the typical damage forms of the jointing glue were summarized. According to the image and data, the damage development trend and the change law of each damage index are analyzed, and the influence of each damage index is considered synthetically. The damage evaluation model of grouting joint under different construction technology is established. Secondly, the causes of various damage forms and their effects on pavement performance and sealant properties are analyzed. The results show that natural aging and pavement temperature stress are the main causes of the network crack on the surface of the filling joint glue, the natural aging will decompose the SBS and other modifiers in the seams, and the natural aging will reduce the cone penetration of the seams. With the increase of softening point, the glass transition temperature increases, the tensile property at low temperature becomes worse, the joint filling adhesive cracks prematurely, the function of water density is destroyed, and the pavement performance is further affected. Thirdly, the evaluation indexes of mechanical self-healing and functional self-healing were selected, and the influencing factors of self-healing were analyzed. The results show that the filling seams with good low temperature and high temperature properties have better bearing capacity and mechanical self-healing ability, and the adhesive cracks of different seams can heal after self-healing at a certain temperature for a certain time. The lower the crack width, the higher the self-healing temperature, the longer the self-healing time, the cleaner the bonding environment and the higher the self-healing degree of the seams. Finally, according to the self-healing test and the real service environment, the failure discriminant index and criterion are established, and the failure discrimination method is put forward and the flow chart is introduced in detail.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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