Why Use Vibrators?

The Nature of Fresh Concrete Before Hardening

Once concrete has hardened, it appears strong, uniform, and solid. However, freshly mixed concrete (fresh concrete) is nothing more than a mixture of completely different materials. Specifically, it consists of sand and gravel of various sizes (solids), powdered cement, water (a liquid), and entrapped air bubbles (a gas). Although it appears to have a uniform form, the individual constituents resist mixing with one another due to friction between the particles, resulting in a non-uniform and heterogeneous state.

The Importance of Vibration Consolidation

During concrete placement, fresh concrete is consolidated by applying appropriate vibration with a concrete vibrator. This vibration temporarily fluidizes the fresh concrete, producing the following beneficial effects:

• Increases concrete density and improves compaction.
• Removes unwanted entrapped air (voids).
• Promotes uniform distribution of aggregates and prevents segregation.

As a result, concrete structures and products can achieve higher strength, greater durability, and superior surface finish quality.

Density: The Foundation of Durability

Concrete can be described as a material in which aggregates such as sand and gravel, which do not undergo chemical change, are bonded together by cement and water, which harden through a chemical reaction. After the concrete has hardened, the reinforcement inside is protected by the concrete cover surrounding the reinforcing steel. Two of the most important factors protecting reinforcing steel from corrosion are the alkaline nature of concrete and its dense, impermeable structure, which resists the penetration of water and air. Increasing concrete density through proper vibration consolidation is therefore essential for ensuring the long-term durability of concrete structures.

Note: Fresh Concrete

Concrete in the state from immediately after mixing through placement into formwork until the beginning of setting and hardening.