Which of the following Indian standard codes is referred for Ordinary Portland cement of 53 grade?

Explanation:

Indian Standard Codes for Ordinary Portland Cement

In India, the Bureau of Indian Standards (BIS) has specified various codes for different grades of cement. These codes ensure that the cement produced meets the necessary quality and safety standards. The codes are categorized based on the grade and type of cement. Ordinary Portland Cement (OPC) is one of the most commonly used types, and it is categorized into different grades such as 33, 43, and 53 based on their compressive strength.

Analyzing the Given Options

1. IS 1489 (Part I)-1991: (Incorrect)

   • IS 1489 (Part I) pertains to Portland Pozzolana Cement (PPC) and not Ordinary Portland Cement (OPC).

2. IS 8112-1989: (Incorrect)

   • IS 8112 specifies the standards for 43 grade Ordinary Portland Cement, not 53 grade.

3. IS 269-1989: (Incorrect)

   • IS 269 is the code for 33 grade Ordinary Portland Cement.

4. IS 12269-1987: (Correct)

   • IS 12269 specifies the standards for 53 grade Ordinary Portland Cement. This code ensures the quality and strength requirements are met for this specific grade of cement.