For the portable concrete plant of concrete

Workers Sunaba to reporters , a few years ago , in which several large Sunaba in Shenzhen , as well as river sand shipped from all over the sales, but a cubic river sand lowest price but also 165 yuan , many builders are river sand prices too high, and the price of sand as long as jianxin portable concrete plant to buy a cube of sea sand , river sand cheaper than the nearly 120 yuan , so now the Shenzhen market sales of building materials used in construction sand, and sand are used seawater washed " washed sand ." Construction of reinforced sand erosion damage after short life reporter learned that , according to the People's Republic of China Ministry of Construction in September 2004 released the " strict construction sand management advice " in the provisions , sand must undergo purification treatment , only to meet the requirements for the preparation of concrete. If you must use sand , fresh water should be flushed through its chloride ion content of not more than 0.02 %. But reporters at the scene saw the sand wash water , still water, do not use fresh water. After the experts say , does not meet the sand containing chloride concrete batching plant state regulations , if a large presence in the building, the fission process of erosion of steel , is specifically classified as the incubation period and period of development, through these two stages , the use of sea sand the basic architecture can be called dangerous . Compared to the state 's 50-year civil life, building sand short life a lot.