GB 2938-1997

GB 2938-1997 specifies the technical requirements, test methods, and quality standards for low heat expansive cement, which is designed to produce low hydration heat and controlled expansion during curing. It is primarily applied in mass concrete structures such as large dams, heavy foundation works, and tunnel linings where thermal cracking from heat generation must be minimized, and in grouting or repair applications requiring compensation for drying shrinkage. The standard ensures the cement meets performance criteria for both strength and volume stability in hydraulic engineering and large-scale construction projects.