The list of testing criteria eligible for operation in this Certificate includes: Cement physical and mechanical testing; Mechanical testing of aggregates for concrete and mortar; Physical and mechanical testing of concrete mixtures and heavy concrete; Testing chemical additives for concrete. Technical standards used for the tests are fully listed, including Vietnamese and foreign standards (if any). When there is a new version of technical standards to replace the old standards, the corresponding new standards must be applied. This certificate is valid for 5 years from the date of issue.