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氯盐能引起混凝土中钢筋锈蚀,从而影响钢筋混凝土结构物的耐久性。在此方面,国内外已有不少经验和教训,并有更加严格控制氯盐在混凝土中限量的趋势。氯盐一方面来自于混凝土原材料,如拌合水、海砂及氯盐外加剂等;另一方面来自于使用环境,如海洋及沿海地域的结构物经常受到氯盐的侵蚀。海砂是一种可用的资源,我国海岸线长,目前沿海建设发展迅速,已有一些单位直接使用海砂作为混凝土的细骨料,一方面有就地取材、充分利用资源之便;另一方面也为钢筋锈蚀增加了新的因素,有认真对待
Chloride salts can cause corrosion of reinforcing bars in concrete, thus affecting the durability of reinforced concrete structures. In this regard, there have been many experiences and lessons learned both at home and abroad, and there is a trend of more strict control of chloride salts in concrete. On the one hand, chloride salts come from concrete raw materials, such as mixing water, sea sand, and chloride admixtures; on the other hand, they come from the use environment. Structures such as the sea and coastal areas are often eroded by chlorine salts. Sea sand is a kind of usable resource. China has a long coastline, and the current coastal construction is developing rapidly. Some units have directly used sea sand as a fine aggregate for concrete. On the one hand, they have access to local resources and make full use of resources; on the other hand, It also adds new factors to the corrosion of steel bars and takes them seriously.