Use of Superplasticizer in Concrete

(Use of Superplasticizer in Concrete)

use of superplasticizer in concrete

Superplasticizers are a type of water reducer that is added to concrete and mortar to reduce the water-cement ratio without negatively impacting the workability of the mix. They are particularly useful in the production of self-consolidating concrete and high performance concrete.

The use of superplasticizers in concrete can save the concrete producer time and money because it allows them to produce a high strength concrete with a low water-cement ratio, saving both cement and water. In addition, superplasticizers can increase the durability of the concrete by reducing shrinkage and increasing compressive strength.

When used in fresh concrete, the amount of water reduction achievable with a particular superplasticizer varies according to the dosage and initial slump. However, a higher superplasticizer dosage will generally require more water reduction in comparison to a lower superplasticizer dosage.

Setting Properties:

The amount and type of superplasticizer admixture may alter the initial and final setting times of flowing concrete, but not to a great extent. At small doses, the setting times are retarded; at high dosage they are accelerated.

Shrinkage:

Superplasticizers reduce the shrinkage of concrete to a significant extent, usually to a level that is comparable to the shrinkage of normal concrete. They also enhance the bond between reinforcing steel and concrete. They can be used in conjunction with various mineral admixtures, including silica fume, for example to produce a low-permeability concrete. This increases its early strength development and is particularly advantageous in the production of precast concrete components.

(Use of Superplasticizer in Concrete)