What does IS Code 1489 (Part 1) :1991 says regarding PPC
Here are the most important points from IS 1489 (Part 1): 1991 for Portland pozzolana cement (fly ash-based)
Composition:
Fly Ash:
* This type of cement includes fly ash, which is a byproduct of burning pulverized coal in electric power generating plants.
Portland Cement Clinker:
* Mixed with fly ash to create Portland pozzolana cement.
Physical Requirements:
Fineness:
* The cement must be finely ground. It should have a specific surface area not less than 300 square meters per kilogram.
Setting Time:
* The initial setting time should not be less than 30 minutes, and the final setting time should not be more than 600 minutes.
Soundness:
* The cement should not expand more than 10 mm when subjected to the Le-Chatelier method, ensuring it remains stable and durable.
Compressive Strength:
* After 3, 7, and 28 days of curing, the minimum compressive strength should be 16, 22, and 33 MPa (megapascals) respectively.
Chemical Requirements:
Loss on Ignition (LOI):
* This should not exceed 5%, indicating minimal impurities and ensuring the quality of cement.
Magnesium Oxide (MgO):
* Should not be more than 6%, as higher content can cause unsoundness in the cement.
Sulphuric Anhydride (SO3):
* Should not exceed 3%, as it can affect the durability and setting time.
Alkali Content:
* The sodium oxide equivalent should not be more than 0.6%, to prevent alkali-aggregate reaction.
Testing Methods:
* The code specifies various tests to ensure the quality and performance of the cement, such as fineness testing, setting time determination, soundness test, and compressive strength test.
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