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在砼构件生产中,构件成型面往往出现较多的孔泡(俗称麻面),这是由于浇筑时砼与模板界面间截留了水泡或气泡的缘故。表面孔泡的产生与砼配合比、骨料级配、浇筑振捣工艺、模板种类和结构形式以及脱模剂种类等因素有关。国外对砼表面孔泡产生的原因及控制曾进行过研究,提出了一些控制措施,认为采用钢模板时,选用适当的脱模剂或在砼中掺入某些外加剂,有利于减少表面孔泡。我们以钢模板生产的砼构件为研究对象,从浇筑振捣工艺和脱模剂选用上来寻求控制表面孔泡
In the production of concrete components, there are often more pores (commonly referred to as hemp surface) on the forming surface of the components. This is due to the retention of blisters or bubbles in the interface between the crucible and the template during pouring. The formation of surface pores is related to the ratio of cerium, the aggregate grading, the casting vibrating process, the type and structure of the template, and the type of release agent. The foreign countries have conducted research on the causes and control of the surface pores of the crucible and proposed some control measures. It is believed that when using the steel template, an appropriate release agent is used or some additives are added to the crucible to help reduce surface pores. bubble. We use the stencils produced from steel formwork as the research object, and seek to control the surface blister from the selection of casting vibrators and release agents.