A couple of developers in Shenzhen have been caught using sea sand, which corrodes steel and leads to cracks in walls and floors.
Workers in sand fields told CCTV that developers choose sea sand because it costs around 30 yuan per cubic meter, but the safer river sand is priced at at least 165 yuan.
According to the regulation issued by construction ministry of China in 2004 regarding the use of sea sand in construction, sea sand must be washed by fresh water until it contains less than 2% of chloride ion. But no tests have been carried out before their usage in Shenzhen by far.
Developers Caught Using Sea Sand