聚氨酯密封胶用于中低面板坝接缝表层止水的性能试验研究

发布时间：2018-06-24 21:07

本文选题：表层止水材料 + 聚氨酯　；参考：《新疆农业大学》2015年硕士论文

【摘要】：本文以聚氨酯材料为研究对象,模拟实际面板坝变形缝的三向变位情况,研制聚氨酯柔性表层止水结构的试验装置；通过材料试验研究,分析聚氨酯止水材料应用于寒冷地区混凝土面板坝表层止水的适应性以及在寒冷地区各种施工条件下的若干性能,探讨使用聚氨酯止水材料代替传统面板坝表层止水材料应用于寒冷地区中低混凝土面板坝表层止水的可行性。本文试验结果表明：(1)施工后的养护环境对非焦油型普通聚氨酯材料的粘接强度有较大影响,在潮湿环境及室外低温环境下,聚氨酯材料的粘接强度明显下降；(2)在相同养护环境和相同冻融循环次数条件下,普通非焦油型聚氨酯材料的拉伸强度明显高于普通焦油型聚氨酯材料。因此,在寒冷地区,用于面板坝接缝止水的聚氨酯应优先选用非焦油型聚氨酯材料；(3)混凝土界面潮湿或粘有灰尘和泥土等都会明显降低聚氨酯材料的粘接强度,因此,在实际施工中,应注意清理界面、对缝面进行烘干处理,使缝表面尽量干净、干燥之后再进行聚氨酯材料嵌缝施工,以保证接缝止水的可靠性；(4)本文研制的聚氨酯柔性表层止水试验装置,可以对实际工程变形缝中的表层柔性止水材料进行三维变形承压模拟试验,可检验柔性止水材料适应变形的能力和承受水压的能力,为工程应用提供依据；(5)聚氨酯止水材料具有良好的粘接性能、弹性性能和适应变形的能力,在低水头(30m)压力下具有适应较大三向变位(张拉10mm,剪切20mm,沉陷20mm)的能力；在中等水头(50m)压力下具有适应三向变位(张拉5mm,剪切10mm,沉陷10mm)的能力；可用于中低水头情况下的面板坝变形缝中的表层止水。
[Abstract]:In this paper, the experimental device of polyurethane flexible surface sealing structure is developed by simulating the triaxial displacement of deformation joint of concrete face slab dam, taking polyurethane material as the research object. This paper analyzes the adaptability of polyurethane watertight material applied to the surface of concrete face slab dam in cold area and some properties under various construction conditions in cold area. This paper discusses the feasibility of using polyurethane watertight material to replace the traditional surface watertight material of concrete face slab dam in cold area. The experimental results show that: (1) the curing environment after construction has great influence on the adhesive strength of non-tar ordinary polyurethane materials, and the adhesive strength of polyurethane materials decreases obviously in the wet environment and outdoor low temperature environment; (2) under the same curing environment and the same number of freeze-thaw cycles, the tensile strength of ordinary non-tar polyurethane is obviously higher than that of common tar polyurethane. Therefore, in cold regions, polyurethane used to seal the joints of face slab dams should be preferred to non-tar polyurethane materials; (3) the wet interface of concrete or the adhesion of dust and soil will significantly reduce the adhesive strength of polyurethane materials, therefore, In actual construction, attention should be paid to cleaning the interface, drying the joint surface so as to make the joint surface as clean as possible, and then carrying on the polyurethane material jointing construction after drying, so as to ensure the reliability of the joint water stop. (4) the polyurethane flexible surface sealing test device developed in this paper can be used to simulate the three dimensional deformation and bearing pressure of the surface flexible watertight material in the actual engineering deformation joint. The ability of flexible watertight materials to adapt to deformation and to withstand water pressure can be tested to provide the basis for engineering application. (5) Polyurethane watertight materials have good adhesion, elastic properties and ability to adapt to deformation. Under the pressure of low water head (30m), it has the ability to adapt to larger triaxial displacement (tensioning 10mm, shearing 20mm, subsidence 20mm), and to three-way displacement (tensioning 5mm, shearing 10mm, subsidence 10mm) under medium head pressure (50m), and has the ability to adapt to triaxial displacement (tensioning 5mm, shearing 10mm, subsidence 10mm). It can be used to stop the surface water in the deformation joint of the face slab dam under the condition of middle and low water head.
【学位授予单位】：新疆农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV44

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