我国有长达一万八千多公里的海岸线和星罗棋布的沿海岛屿。随着我国沿海地区的经济发展,滨海的工程建设将大大加快,其中以钢筋混凝土为主体结构的建筑物和公共设施占育重要位置。海水中含有多量氯盐,滨海空气中含有海水的微滴,对钢筋混凝土结构带来不利影响,对钢筋有侵蚀作用。为了防止钢筋的锈蚀,应尽可能使用河砂、山砂或湖砂。如果就地取材使用海砂,必须在拌制混凝土前用 Our country has more than 18,000 kilometers of coastline and dotted islands. With the economic development in the coastal areas of China, the coastal construction will be greatly accelerated, and buildings and public facilities with the main structure of reinforced concrete will occupy an important position. Seawater contains a large amount of chlorine salts, and seashore air contains micro-drops of seawater, which has an adverse effect on reinforced concrete structures and corrodes steel. In order to prevent corrosion of steel bars, river sand, mountain sand, or lake sand should be used as much as possible. If sea sand is used locally, it must be used before mixing concrete