行车振动对桥面维修新老混凝土粘结性能影响试验研究

发布时间：2018-08-13 09:32

【摘要】：在交通事业快速发展的同时桥梁经常处于超负荷工作状态,导致桥面出现各种破坏现象,为了减小桥面维修对正常通行的影响,桥面混凝土维修经常采取边维修边通车的不断交施工方法,然而行车引起的桥梁振动对修补混凝土与老混凝土粘结性能的影响成为确保桥面混凝土维修质量的关键。本文采用风冷电磁振动台模拟行车引起的桥梁振动,通过试验研究和分析在一定粗糙度的情况下持续的桥梁振动对处于不同凝结硬化过程的新老混凝土粘结性能的影响,为不断交条件下桥面铺装维修的设计和施工提供技术支持。具体内容如下:(1)桥梁振动的频率和振幅受到桥梁结构形式、车辆荷载大小、车辆行驶速度、桥面平整度以及桥梁阻尼的影响。根据现场一座具有代表性的桥梁通过振动测试仪现场测得桥梁实际工作下的具体参数,结合相关文献对模拟桥梁振动参数进行分析并选取,得出合适的频率和振幅,为室内试验风冷电磁试验振动台提供合理参数。(2)老混凝土的凿毛程度对新老混凝土粘结层的力学性能有重要影响。通过新老混凝土粘结性能室内试验,对比研究不同凿毛深度对结合面粘结强度的影响,分析找到较合理的凿毛深度,为提高新老混凝土结合面粘结性能的设计施工提供依据。(3)粘结剂的种类也是影响新老混凝土粘结层力学性能的另一重要因素。本文通过新老混凝土粘结性能室内试验,研究水泥浆类界面剂与化学类界面剂对新老混凝土结合面粘结层的粘结强度影响规律,提出合理的界面剂种类,为提高新老混凝土结合面粘结层性能的设计和施工提供依据。(4)在上述研究的基础上,通过室内新老混凝土不同粘结方位的振动试验,得出粘结强度提升的影响程度从大到小依次为浇筑至初凝阶段的振动、浇筑至终凝阶段的振动和初凝至终凝阶段的振动,在不断交情况下桥面铺装维修处于水平粘结修复面可以不采取加强措施,处于垂直粘结修复面需采取一定的加强措施。
[Abstract]:With the rapid development of transportation industry, the bridge is often in a state of overload, which leads to various damage phenomena on the deck, in order to reduce the impact of bridge deck maintenance on the normal traffic. Bridge deck concrete maintenance often adopts the method of continuous intersecting while maintaining and opening to traffic. However, the influence of bridge vibration caused by driving on the bond property between repair concrete and old concrete becomes the key to ensure the maintenance quality of bridge deck concrete. In this paper, the wind-cooled electromagnetic vibration table is used to simulate the bridge vibration caused by driving. The influence of the continuous bridge vibration on the bond performance of the new and old concrete under different solidification and hardening processes is studied and analyzed through experiments. Provide technical support for the design and construction of bridge deck pavement maintenance. The main contents are as follows: (1) the vibration frequency and amplitude of the bridge are affected by the structure of the bridge, the size of the vehicle load, the speed of the vehicle, the smoothness of the bridge deck and the damping of the bridge. According to the actual working parameters of a representative bridge measured in the field by vibration tester, the vibration parameters of simulated bridge are analyzed and selected according to relevant literature, and the appropriate frequency and amplitude are obtained. It provides reasonable parameters for the air-cooled electromagnetic test shaking table in indoor test. (2) the hair-chiseling degree of the old concrete has an important influence on the mechanical properties of the new and old concrete bond layer. Through the laboratory test of the bond property of the new and old concrete, the influence of different hair-chiseling depth on the bond strength of the bonding surface is studied, and the reasonable hair-chiseling depth is found. It provides the basis for the design and construction of the bond performance of the new and old concrete. (3) the type of binder is another important factor that affects the mechanical properties of the new and old concrete bond layer. In this paper, the influence of cement slurry and chemical interfacial agent on bond strength of new and old concrete bond surface is studied through laboratory test of new and old concrete bond properties. A reasonable type of interface agent is put forward. In order to improve the design and construction of bond layer performance of new and old concrete bond surface. (4) on the basis of the above research, through the vibration test of different bond orientation of new and old concrete, It is concluded that the influence degree of bond strength promotion is the vibration from pouring to initial setting, the vibration from pouring to final setting, and the vibration from initial setting to final setting. Under the condition of continuous delivery, the horizontal bond repair surface can be repaired without strengthening measures, and some strengthening measures should be taken in the vertical bond repair deck.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U444

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