Technical standards and specifications related to the testing of building materials

Building materials testing is strictly guided by a series of domestic and international technical standards and specifications. Domestic standards mainly include national standards (GB series) and industry standards (such as JGJ, JC, YB, etc.), including standards such as "General Portland Cement" (GB175), "Code for Acceptance of Construction Quality of Concrete Structures" (GB50204), and "Limits of Radionuclides in Building Materials" (GB6566).

Common international standards include those from the International Organization for Standardization (ISO), the American Society for Testing and Materials (ASTM), and European standards (EN), such as ASTM C109 (compressive strength testing of mortar) and ISO 8990 (determination of steady-state thermal transmission properties of building components). These standards regulate testing methods, sample requirements, instrument accuracy, and result expression, and are the fundamental basis for ensuring the scientific validity, impartiality, and international comparability of test results.