Viscosity Modifying Admixtures (VMAs)
Purpose:
VMAs are used to improve the cohesiveness and stability of concrete mixes, especially in highly flowable concretes.
How do inhibitors work?
They help control the viscosity, preventing segregation and improving the workability and stability of the mixture.
Types:
Polysaccharides
Natural or synthetic polysaccharides are used to increase the viscosity and provide better flow retention, particularly in self-consolidating concrete.
Polymeric Thickeners
These are synthetic polymers that modify the rheological properties of concrete, increasing its resistance to segregation while maintaining its flowability.
Application areas:
Self-Consolidating Concrete (SCC)
VMAs ensure that the concrete remains stable and cohesive during the placement process without the need for external vibration.
Underwater Concreting
In underwater applications, VMAs help prevent segregation and ensure a uniform mixture during placement.
Advantages:
STRENGTH
Increasing the service life of concrete
PROTECTION
Preventing destruction
SAVING
Reducing repair costs
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