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What does “Sea-Sand Building” refer to?

A so-called Sea-Sand Building refers to a building constructed with concrete mixed with sand from the ocean instead of river sand, which is normally used. Due to the high chloride ion content, in the short term sea sand causes white stains to emerge from the walls, commonly referred to as “Wall Cancer. In the long term, the contents will accelerate rebar corrosion and result in flaking of the concrete in blocks, severely damaging the building’s structure.
There are now two anti-corrosive applications: one is the cathodic protection technique, while the other is the electrochemical chloride extraction technique; both can be applied to slow down rebar corrosion and prolong the lifespan of building structures.