水库大坝混凝土面板抗碳化技术研究

Research on Carbonation Resistance Technology for the Concrete Panel of Reservoir Dams

常规的混凝土面板抗碳化技术多数采用水泥基涂层作为抗碳化涂层,防护效果较差,导致混凝土面板碳化速度较快,碳化深度较大,无法充分起到化学保护与抗碳化作用。基于此,文章以S水库大坝工程为例,开展了混凝土面板抗碳化技术的全方位研究。首先,对混凝土面板表面进行预处理,使其表面保持清洁。其次,选取二氧化碳与水玻璃溶液发生化学反应生成的硅凝胶,作为抗碳化涂层,涂刷在面板表面。在此基础上,对混凝土面板进行喷浆与养护处理,完成抗碳化技术流程。根据实例分析结果可知,新的技术具有较高的可行性,混凝土面板最大碳化深度始终不超过5 mm。

The conventional carbonation resistance technology of concrete panels mostly uses cement-based coating as anti-carbonation coating,and the protective effect is poor,which leads to rapid carbonation and large carbonation depth of concrete panels,and can not fully play the role of chemical protection and carbonation resistance.Based on this,taking S reservoir dam engineering as an example,a comprehensive study on the carbonation resistance technology of concrete panels is carried out.Firstly,the surface of the concrete panel is preprocessed to keep the surface clean.Secondly,the silica gel produced by the chemical reaction between carbon dioxide and water glass solution is selected as the anti-carbonation coating to be brushed on the surface of the panel.On this basis,the concrete panel is sprayed and cured to complete the anti-carbonation technical process.According to the results of case analysis,it can be seen that the new technology has high feasibility,and the maximum carbonation depth of concrete panels is always less than 5 mm.