水泥混凝土桥面铺装层早期裂缝分析及修补材料研究

发布时间：2018-04-13 05:40

本文选题：道路工程 + 水泥混凝土　；参考：《北京交通大学》2014年硕士论文

【摘要】：水泥混凝土桥面铺装层是一种特殊的路面结构,它承担着保护桥面板和充当路面功能的作用。但是现阶段桥面铺装层早期病害日趋严重,破坏形式主要表现为裂缝。本文主要通过室内试验从以下几个方面研究了水泥混凝土桥面铺装层早期裂缝的影响因素,并对早期裂缝的发展进行了预估分析,同时对裂缝的修补材料进行了相关研究。 1、对影响早期开裂收缩的相关因素进行了试验研究。主要研究了矿物掺合料和水灰比对混凝土塑性开裂的影响,不同掺合料和外加剂对桥面铺装混凝土早期收缩的影响。结果表明：矿物掺合料能够显著影响塑性开裂的时间,增加了裂缝平均开裂面积和总裂开面积,矿物掺合料建议掺25%左右的粉煤灰；水灰比的降低会使混凝土出现塑性裂缝的时间提前,水灰比低于0.4时影响显著增大；纤维以及纤维混掺不同掺合料和外加剂都能抑制混凝土收缩,纤维混掺粉煤灰效果最佳。 2、研究了纤维对混凝土强度的影响以及配筋率对钢筋混凝土轴向直接拉伸的影响。得出：纤维的掺入在一定程度上降低了混凝土的抗压强度,提高了劈裂强度、抗弯拉强度、轴向拉力和峰值应变,强度受掺量及尺寸的影响；配筋率对首次开裂影响不大,但数量多直径细的配筋形式能够更为有效地控制裂缝宽度发展。 3、根据桥面铺装实际使用过程中的断裂形式,建立了2种基于一定假设条件下的数学模型。对2个模型的混凝土应力、钢筋应力、混凝土位移、裂缝宽度等进行了分析,并通过迭代法对问题进行求解。 4、对桥面铺装层裂缝修补进行了研究。主要研究了环氧树脂的修补性能,确定了相关配合比。本论文研究成果可用于桥面铺装层材料设计、配筋率和裂缝修补参考。
[Abstract]:Cement concrete bridge deck pavement is a special pavement structure, which plays the role of protecting bridge deck and acting as pavement function.But at present, the early disease of bridge deck pavement is becoming more and more serious, and the main failure form is crack.In this paper, the influencing factors of early cracks in cement concrete bridge deck pavement are studied from the following aspects through laboratory tests, and the development of early cracks is predicted and analyzed. At the same time, the repair materials of cracks are studied.1. The related factors affecting early cracking and shrinkage were studied experimentally.The effect of mineral admixture and water-cement ratio on plastic cracking of concrete and the effect of different admixtures and admixtures on the early shrinkage of bridge deck pavement concrete were studied.The results show that mineral admixtures can significantly affect the time of plastic cracking and increase the average crack area and total crack area. The mineral admixture is suggested to add about 25% fly ash.The decrease of water-cement ratio can advance the time of plastic crack in concrete, and the influence of water-cement ratio is significantly increased when the ratio of water to cement is lower than 0.4, fiber and fiber mixed with different admixtures and admixtures can inhibit the shrinkage of concrete, and fiber mixing with fly ash has the best effect.2. The influence of fiber on the strength of concrete and the effect of reinforcement ratio on the axial tensile strength of reinforced concrete are studied.It is concluded that the addition of fiber reduces the compressive strength of concrete to a certain extent, increases the splitting strength, flexural tensile strength, axial tensile force and peak strain, and the strength is affected by the content and size of the concrete, and the ratio of reinforcement has little effect on the first cracking.However, a large number of small reinforcement with multiple diameters can control the crack width more effectively.3. According to the fracture form of bridge deck pavement in practical use, two kinds of mathematical models based on certain assumptions are established.The concrete stress, reinforcement stress, concrete displacement and crack width of the two models are analyzed, and the problem is solved by iterative method.4. The crack repair of bridge deck pavement is studied.The repair performance of epoxy resin was studied and the correlation ratio was determined.The research results of this paper can be used for bridge deck pavement material design, reinforcement ratio and crack repair reference.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.33;U445.7

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