dig sea sand river sand building materials market

South to quote according to CCTV financial channel etc, in recent days, the Revelations of shenzhen residents building floor slab crack, crack problem of wall body, every rainy day ooze water not only. And according to the survey, the city construction is the root of the problem when using large amounts of sea sand. Excessive amounts of chloride ion in sea sand to serious corrosion in reinforced construction, even collapse. And is this "sea sand ruins" abound in shenzhen! And unscrupulous developers chose "sea sand concrete construction, because it can save half of the cost. Buildings as rapacious profiteers become endangered, regulation has turned a blind eye, somebody help shenzhen ruins... Shenzhen: thousand truck dig sea sand river sand building materials market According to the ministry of construction issued in September 2004 the opinions on strict sea sand used in construction management, regulation, sea sand must undergo purification treatment, can be used to meet the requirements before preparation of concrete. Of reinforced concrete, chloride ion content in the sea sand shall not be greater than 0.06%. If you must use sea sand, should by the fresh water, the chloride ion content shall not be greater than 0.02%.