行车振动对桥面快速修补高性能混凝土性能影响试验研究

发布时间：2018-04-17 15:01

本文选题：桥梁振动 + 快速修补　；参考：《石家庄铁道大学》2016年硕士论文

【摘要】：我国经济迅速发展,交通量迅猛增长,高速公路桥梁所经受的荷载强度不断提高,出现许多桥面铺装出现破坏现象,带来了繁重的维修工程。由于通行要求和施工条件限制,桥面维修经常需要在不断交(1/4幅通车,1/4幅维修)条件下实施,此时修补混凝土的凝结硬化过程始终处于桥梁振动的扰动环境中,该扰动对修补混凝土的力学性能及耐久性的影响值得关注。本文首先研制能够满足桥面快速维修需求的高性能快速修补混凝土,随后在分析行车引起桥梁振动特性的基础上,采用电磁振动试验台模拟桥梁振动,开展不同振动频率和振幅条件下桥面快速修补高性能混凝土的受迫振动模拟实验,进而研究和分析持续的桥梁振动对桥面快速修补高性能混凝土不同龄期抗压强度及56 d耐久性的影响。具体内容如下:(1)通过优化混凝土基准配合比,调整掺入矿物掺合料比例,得到满足高速公路桥面快速维修要求的、工作性能好、早期强度高、耐久性好的桥面快速修补混凝土,研制的高性能快速修补混凝土能够实现桥面24 h~72 h通车,从而实现了桥面快速修复。(2)行车振动对桥面修补混凝土的早期强度影响程度决定着正常开放交通的时间,通过电磁振动试验台模拟桥梁振动,研究不同振动参数的桥梁振动对处于不同凝结硬化阶段快速修补混凝土强度影响规律,试验得出快速修补高性能混凝土1 d、2 d龄期的抗压强度有较明显的降低,最大降低为9.1%,振动对修补混凝土后期强度影响较小。(3)通过振动对混凝土影响室内试验,研究不同振动参数的桥梁振动对处于不同凝结硬化阶段快速修补混凝土耐久性影响规律,试验得出由于修补混凝土后期水化反应的自修复作用,行车引起的桥梁振动对修补混凝土耐久性影响不明显,可忽略不计,试验结果为提高桥面铺装快速修补混凝土的施工提供依据。(4)以上述研究为基础,在京张高速分离立交桥、京沪高速公路小桥及京秦高速公路小桥进行现场实体试验,得出快速维修铺装混凝土施工性能优良,满足了针对试验段提出的混凝土各项维修要求的各项技术指标。
[Abstract]:With the rapid development of our economy and the rapid growth of traffic volume, the load intensity of highway bridges has been continuously increased, and many bridge deck pavement has been damaged, which has brought heavy maintenance works.Due to the limitation of traffic requirements and construction conditions, bridge deck maintenance often needs to be carried out under the condition of continuous maintenance of 1 / 4 pieces of bridge deck. At this time, the condensation and hardening process of repairing concrete is always in the disturbed environment of bridge vibration.The effect of the disturbance on the mechanical properties and durability of repaired concrete deserves attention.In this paper, the high performance and fast repairing concrete can be developed to meet the needs of the bridge deck rapid maintenance, and then on the basis of analyzing the vibration characteristics of the bridge caused by driving, the electromagnetic vibration test bed is used to simulate the bridge vibration.The forced vibration simulation experiment of rapid repair of high performance concrete with different vibration frequencies and amplitudes was carried out.The effects of continuous bridge vibration on the compressive strength and 56 d durability of the bridge deck for rapid repair of high performance concrete at different ages were studied and analyzed.The concrete contents are as follows: 1) by optimizing the standard mix ratio of concrete and adjusting the proportion of mineral admixtures, the concrete can be quickly repaired on the bridge deck with good working performance, high early strength and good durability.The high performance and fast repairing concrete can realize the opening of the bridge deck for 24 hours and 72 hours, thus realizing the bridge deck quick repair. 2) the influence of the driving vibration on the early strength of the bridge deck repair concrete determines the time of normal open traffic.By simulating bridge vibration with electromagnetic vibration test rig, the influence of bridge vibration with different vibration parameters on the strength of concrete at different solidification and hardening stage is studied.The results show that the compressive strength of high performance concrete for 1 d ~ 2 d is obviously reduced, and the maximum reduction is 9. 1, and the vibration has little effect on the later strength of repaired concrete.) through vibration, the effect of vibration on concrete is tested in laboratory.The effect of bridge vibration with different vibration parameters on the durability of concrete repaired rapidly at different solidification stage is studied. The self-repairing effect of hydration reaction in the later stage of repairing concrete is obtained by the experiment.The bridge vibration caused by driving has no obvious effect on the durability of repairing concrete, and it can be ignored. The test results provide a basis for improving the construction of bridge deck paving and quick repairing concrete.) on the basis of the above research, the bridge is separated from each other at Beijing-Zhang high speed overpass.Based on the field test of Beijing-Shanghai Expressway small Bridge and Jingqin Expressway small Bridge, it is concluded that the quick maintenance pavement concrete has good construction performance and meets the various technical indexes of concrete maintenance requirements for the test section.
【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】：2016
【分类号】：U444

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