有机成膜涂层混凝土抗碳化性能的时变退化
发布时间：2018-08-22 14:53
【摘要】：在混凝土表面敷设有机成膜涂层来提高混凝土的抗碳化能力是一种既简便又有效的方法,具有广阔的应用前景。本文选择了环氧富锌底漆、环氧云铁中间漆、聚氨酯面漆、环氧树脂面漆和氯化橡胶面漆等五种常见的有机涂料,以有机成膜涂层混凝土为研究对象,采用紫外加速老化和室外自然暴露老化方法对混凝土表面涂层进行老化。对老化前后的涂层混凝土进行加速碳化实验,系统地研究了涂层对混凝土抗碳化性能的影响。针对涂层易老化的特性,利用纳米SiO_2对涂层进行改性。通过加速碳化和紫外老化实验,研究了改性涂层的碳化防护能力和紫外老化性能。通过涂层性能实验对改性涂层防护性能进行验证,结合微观实验对改性涂层防护机理进行分析。通过对涂层混凝土碳化实验研究,有以下发现:在同一涂层体系厚度下,涂层体系碳化防护能力排序为:聚氨酯涂层体系环氧树脂涂层体系氯化橡胶涂层体系;涂层混凝土抗碳化性能不仅与涂层有关,还与基层混凝土水灰比有关。混凝土水灰比越低,涂层体系对混凝土的碳化防护贡献越小;混凝土碳化深度随着涂层体系厚度的增加呈指数函数减小。通过对老化后涂层混凝土碳化实验的研究,有以下发现:在同一涂层体系厚度下,涂层体系抗老化能力排序为:聚氨酯体系环氧树脂体系氯化橡胶体系;在紫外老化中,涂层体系的防碳化能力随着紫外辐照量的增加呈S型曲线退化;在自然老化中,涂层体系的防碳化能力随着自然老化时间的增加呈抛物线退化;建立了涂层体系在紫外老化条件下的寿命预测方法,并推导出涂层体系在自然条件下的使用寿命;通过微观实验发现,涂层老化主要是由于涂膜发生降解,产生颗粒物、细小孔隙和裂纹。通过对纳米改性涂层的研究,有以下发现:纳米SiO_2能够有效改善涂层混凝土抗碳化性能,且纳米Si O_2对氯化橡胶涂层改善效果好于环氧树脂和聚氨酯;各涂层的最佳纳米SiO_2掺量在0.4%-1.2%之间,当纳米SiO_2掺量超过最佳掺量后,改性涂层的碳化防护效果逐渐降低;纳米Si O_2可以有效改善涂层的抗紫外老化性能,纳米SiO_2掺量在0.4%-1.2%之间效果最好;改性后涂层的耐腐蚀和憎水性能明显提高;加入纳米Si O_2后涂膜得到有效填充,涂膜孔隙明显减少,在紫外光照下涂膜破坏明显降低。通过理论分析和实验数据回归分析,推导出了有机成膜涂层体系混凝土的碳化微分方程;建立了涂层体系当量混凝土厚度和扩散系数计算公式;利用MATLAB编程求出混凝土碳化微分方程数值解;对连续复涂涂层后混凝土碳化深度进行了预测。
[Abstract]:It is a simple and effective method to apply organic film coating on the surface of concrete to improve the carbonation resistance of concrete. In this paper, five kinds of common organic coatings, such as epoxy zinc rich primer, epoxy cloud iron intermediate paint, polyurethane top paint, epoxy resin top paint and chlorinated rubber top paint, are selected. The organic film-forming coating concrete is taken as the research object. UV accelerated aging and outdoor natural exposure aging were used to aging the surface coating of concrete. The effect of coating on carbonation resistance of concrete was studied systematically by accelerated carbonization experiment before and after aging. The coating was modified by nanometer SiO_2 in allusion to the aging property of the coating. The carbonation protection and UV aging properties of the modified coatings were studied by accelerated carbonization and UV aging experiments. The protective performance of the modified coating was verified by the performance experiment of the coating, and the protective mechanism of the modified coating was analyzed in combination with the microscopic experiment. Through the experimental study on the carbonization of coated concrete, the following results are found: under the same coating system thickness, the carbonation protection ability of the coating system is ranked as follows: polyurethane coating system, epoxy resin coating system, chlorinated rubber coating system; The carbonation resistance of the coated concrete is not only related to the coating, but also to the water cement ratio of the base concrete. The lower the water-cement ratio of concrete, the smaller the contribution of the coating system to the carbonation protection of concrete, and the less the carbonation depth of concrete decreases with the increase of the thickness of the coating system. Through the study of carbonization experiment of aged coated concrete, it is found that under the same coating system thickness, the anti-aging ability of the coating system is ranked as follows: polyurethane system, epoxy resin system, chlorinated rubber system, UV aging, The anti-carbonation ability of the coating system degenerates with the increase of UV irradiation, and the anti-carbonation ability of the coating system degenerates with the increase of the natural aging time. The life prediction method of coating system under ultraviolet aging condition was established, and the service life of coating system under natural condition was deduced. Small pores and cracks. Through the study of nano-modified coatings, it is found that nano-sized SiO_2 can effectively improve the carbonation resistance of coated concrete, and nano-SiO2 can improve the coating of chlorinated rubber better than epoxy resin and polyurethane. The optimum SiO_2 content of each coating is between 0.4% and 1.2%. When the content of nano-SiO _ 2 exceeds the optimum content, the carbonation and protection effect of the modified coating decreases gradually, and nano-SiO _ 2 can effectively improve the anti-UV aging performance of the coating. The effect of nano-scale SiO_2 was the best in the range of 0.4- 1.2%; the corrosion resistance and hydrophobicity of the modified coating were improved obviously; the coating film was filled effectively after adding nano-SiO-2, the pore of coating film was obviously reduced, and the damage of coating film was obviously reduced under ultraviolet light. Through theoretical analysis and experimental data regression analysis, the carbonation differential equation of organic film coated concrete is deduced, and the calculation formula of equivalent concrete thickness and diffusion coefficient of coating system is established. The numerical solution of concrete carbonation differential equation is obtained by MATLAB programming, and the carbonation depth of concrete after continuous coating is predicted.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528
本文编号：2197438
[Abstract]:It is a simple and effective method to apply organic film coating on the surface of concrete to improve the carbonation resistance of concrete. In this paper, five kinds of common organic coatings, such as epoxy zinc rich primer, epoxy cloud iron intermediate paint, polyurethane top paint, epoxy resin top paint and chlorinated rubber top paint, are selected. The organic film-forming coating concrete is taken as the research object. UV accelerated aging and outdoor natural exposure aging were used to aging the surface coating of concrete. The effect of coating on carbonation resistance of concrete was studied systematically by accelerated carbonization experiment before and after aging. The coating was modified by nanometer SiO_2 in allusion to the aging property of the coating. The carbonation protection and UV aging properties of the modified coatings were studied by accelerated carbonization and UV aging experiments. The protective performance of the modified coating was verified by the performance experiment of the coating, and the protective mechanism of the modified coating was analyzed in combination with the microscopic experiment. Through the experimental study on the carbonization of coated concrete, the following results are found: under the same coating system thickness, the carbonation protection ability of the coating system is ranked as follows: polyurethane coating system, epoxy resin coating system, chlorinated rubber coating system; The carbonation resistance of the coated concrete is not only related to the coating, but also to the water cement ratio of the base concrete. The lower the water-cement ratio of concrete, the smaller the contribution of the coating system to the carbonation protection of concrete, and the less the carbonation depth of concrete decreases with the increase of the thickness of the coating system. Through the study of carbonization experiment of aged coated concrete, it is found that under the same coating system thickness, the anti-aging ability of the coating system is ranked as follows: polyurethane system, epoxy resin system, chlorinated rubber system, UV aging, The anti-carbonation ability of the coating system degenerates with the increase of UV irradiation, and the anti-carbonation ability of the coating system degenerates with the increase of the natural aging time. The life prediction method of coating system under ultraviolet aging condition was established, and the service life of coating system under natural condition was deduced. Small pores and cracks. Through the study of nano-modified coatings, it is found that nano-sized SiO_2 can effectively improve the carbonation resistance of coated concrete, and nano-SiO2 can improve the coating of chlorinated rubber better than epoxy resin and polyurethane. The optimum SiO_2 content of each coating is between 0.4% and 1.2%. When the content of nano-SiO _ 2 exceeds the optimum content, the carbonation and protection effect of the modified coating decreases gradually, and nano-SiO _ 2 can effectively improve the anti-UV aging performance of the coating. The effect of nano-scale SiO_2 was the best in the range of 0.4- 1.2%; the corrosion resistance and hydrophobicity of the modified coating were improved obviously; the coating film was filled effectively after adding nano-SiO-2, the pore of coating film was obviously reduced, and the damage of coating film was obviously reduced under ultraviolet light. Through theoretical analysis and experimental data regression analysis, the carbonation differential equation of organic film coated concrete is deduced, and the calculation formula of equivalent concrete thickness and diffusion coefficient of coating system is established. The numerical solution of concrete carbonation differential equation is obtained by MATLAB programming, and the carbonation depth of concrete after continuous coating is predicted.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528
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