The use of commercial concrete, commercial mortar also need to report cement, sand and other materials for review it?
We are doing concrete mixer, the other is not very clear!
This depends on the commodity concrete company, the commodity mortar company laboratory has not obtained the local recognition of the helium incineration of the laboratory can be qualified, but also through the corresponding detection capacity parameters assessment. If you can have it.
Lu Guozhi need, cement, sand, gravel need to retrial, but with the self-mixing concrete raw materials review is not exactly the same. The use of business mixed, cement, sand, helium burning incense to teach feng tian fence gravel gravel only need to report retrial report, re-test report is generally provided by the mixed laboratories, if a third party issued a test report of course better, But it is not necessary. Cement takes three days, 28 days test report, but this time do not need to report the cement factory certificate.
