Concrete is considered to be two-phase material
At the microscope level, the complexities of the concrete begin to slow up, particularly in the vicinity of large aggregate particles.
This area is considered as a third phase called the transit zone, which represents the interfacial region zone between the particles of coarse aggregate and hardened paste.
The transition zone is a plane of weakness and therefore has a great influence on the mechanical behavior of concrete.
Effect of Transition zone in properties of concrete is explained below:
- The transition phase is considered a strength-limiting phase.
- Microcracks are developed due to shrinking and variation in temperature.
- Forgiven W/C ratio or cement contain hydration strength decreases with an increase in coarse aggregate size. A similar increase in W/C ratio makes concrete prone to permeability.
- Concrete shows brittle behavior in tension and tough behavior in compression.
I hope this article on “Transition Phase of Concrete” remains helpful for you.
Happy Learning – Civil Concept
Civil Engineer – Ranjeet Sahani