我国每年都有大量混凝土工程要在冬季负温条件下施工。多年来,在大量工程实践和科学实验基础上,虽然已取得了很多成就,但对于在负温度下浇灌混凝土,尚有许多问题未能很好解决,不仅影响着工程建设速度,有时处理不当,还会造成严重的质量事故。冬季浇灌混凝土是在许多不利条件下进行的,不仅施工操作困难,而且养护条件 Every year, a large number of concrete projects in China are to be constructed under negative temperature conditions in winter. Over the years, on the basis of a large number of engineering practices and scientific experiments, although many achievements have been made, there are still many problems that cannot be solved well when pouring concrete under negative temperature. This not only affects the speed of project construction, but it is sometimes mishandled. It will also cause serious quality accidents. Concrete poured in winter is carried out under a number of adverse conditions. It is not only difficult to operate but also conditions for curing.