IS 12600 encompasses low heat Portland cement, detailing its manufacturing, chemical, and physical prerequisites. This standard is essential for applications necessitating minimal heat generation during hydration, such as dam construction with massive concrete structures. Low heat Portland cement specified in IS 12600 features a reduced content of tricalcium aluminate (C3A) and a higher proportion of dicalcium silicate (C2S) at 46 percent.

Low heat Portland cement is manufactured through the meticulous mixing of calcareous and argillaceous materials, along with other substances containing silica, alumina, or iron oxide. This blend undergoes controlled temperature burning, followed by grinding the resulting clinker to achieve cement that meets specified standards. Following the burning process, only gypsum, water, or both, along with a maximum of one percent air-entraining agents, are permissible additives.

Low heat Portland cement must conform to the chemical and physical criteria outlined in the standard when subjected to designated testing methodologies.

TESTS

The specified tests must be conducted as per the prescribed method.

• Fineness

• Soundness

• Setting time test

• Compressive Strength

• Heat of hydration

An appropriately maintained laboratory is essential for conducting various tests according to the methods outlined in the standard.

The manufacturer is responsible for demonstrating compliance with this standard for low heat Portland cement. Each bag or drum of cement must bear the BIS Standard Mark (ISI Mark) on its label, provided the material meets specification requirements. Marking procedures must adhere to IS 12600. Additionally, manufacturers need a BIS license from the Bureau of Indian Standards to use the standard mark (ISI Mark). This license is granted upon successful assessment of manufacturing infrastructure, quality control measures, testing capabilities, and production processes.

PROCESS FOR BIS ISI MARK CERTIFICATION

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