What is risk of cracking in Portland slag cement?

Early-age cracking risk was evaluated for slags with variable Al2O3, MgO and fineness. All slags reduced temperature rise and improved cracking resistance. Cracking potential of slag concretes varied depending on slag properties. A linear relationship was observed between RCF indices and MgO/Al2O3 and fineness.

What are the advantages of slag cement?

Slag concretes have improved long-term strengths even though their early strength development is lower than portland cement concretes. They also have lower permeability and improved durability. Slag cement generally costs less than portland cement.

What is the difference between Portland cement and slag cement?

When used as part of a portland cement concrete, slag reacts with both the water (latent hydraulic reaction) and the hydrated cement paste (pozzolanic reaction), resulting in a more refined microstructure than that of a plain portland cement.

What is Portland Pozzolana cement?

The Portland Pozzolana Cement is a kind of Blended Cement which is produced by either inter-grinding of OPC clinker along with gypsum and pozzolanic materials in certain proportions or grinding the OPC clinker, gypsum and Pozzolanic materials separately and thoroughly blending them in certain proportions.

What is the grade of slag cement?

The strength grades of slag cement can be divided into 32.5, 32.5R, 42.5, 42.5R, 52.5, 52.5R, and their ages should be no less than the value in Table 4.4. The requirements for fineness, setting time and soundness of slag cement are the same to those of ordinary cement.

What are the disadvantages of Portland Pozzolana cement?

Disadvantages of Portland Pozzolana Cement

• The initial strength obtained is less, which effect the de-shuttering of supports early.
• As it contains more fine material, handing of concrete is difficult.
• When compared to the OPC setting time is less for PPC.

How does Portland cement differ from concrete?

Although the terms cement and concrete often are used interchangeably, cement is actually an ingredient of concrete. Portland cement is not a brand name, but the generic term for the type of cement used in virtually all concrete, just as stainless is a type of steel and sterling a type of silver.