论文部分内容阅读
北京市西单北大街西侧商业区8号地住宅及交通广场工程,由于工程工期紧,底板混凝土要求在严冬季节施工,给施工带来极大的不便。常规的方法是掺加防冻剂,用热水搅拌,热水可加速水化反应,使混凝土早期强度增长快,但热水同时会导致混凝土裂缝的产生,破坏混凝土的微观结构。降低混凝土基础温度,延缓水化热峰值的出现,对于控制大体积混凝土裂缝十分重要。因此,北京中铁建筑工程公司决定施工中不掺加防冻剂,不使用热水,而是通过
In the residential area and traffic plaza on the west side of Xidanbei Street in Beijing, due to the tight construction schedule and the construction of the floor slab in the winter season, it has caused great inconvenience to the construction. The conventional method is to add antifreeze, stir with hot water, hot water can accelerate the hydration reaction, so that the early strength of concrete increases rapidly, but the hot water will also lead to cracks in the concrete, destroy the microstructure of concrete. Reducing the temperature of the concrete foundation and delaying the appearance of the heat of hydration peak is very important for controlling the cracks in mass concrete. Therefore, Beijing China Railway Construction Engineering Company decided not to add antifreeze and not to use hot water during construction, but to pass