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挤压成形生产构件机械化作业程度高,在混凝土构件的预制工业中广泛应用。但在冬期施工中,由于气温较低,又在露天生产,不仅施工困难,而且由于构件强度增长缓慢,影响台座的周转。所以在冬期施工中,如何确保挤压成型预应力构件质量,是个很重要的问题。一、混凝土免受冻害的临界强度我国钢筋混凝土工程施工及验收规范(GBJ204-83)规定,当室外日平均气温连续5天稳定低于5℃时,必须采取冬期施工方
Extrusion-forming production components have a high degree of mechanization and are widely used in the precast industry of concrete components. However, in winter construction, due to the low temperature and production in the open air, not only the construction is difficult, but also due to the slow increase in the strength of the components, affecting the turnover of the pedestal. Therefore, in winter construction, how to ensure the quality of extruded prestressed components is an important issue. 1. The critical strength of concrete from frost damage The regulations for the construction and acceptance of reinforced concrete in China (GBJ204-83) stipulate that when the daily average outdoor temperature is stable below 5°C for 5 consecutive days, the winter construction must be adopted.