Control Shrinkage & Cracking
Shrinkage Reducing Admixtures
Shrinkage Reducing Admixtures (SRAs) are specialized chemicals used in concrete to minimize shrinkage during the drying process, thereby reducing the risk of cracking. These admixtures work by reducing the surface tension of water in the capillary pores of concrete, which reduces the shrinkage that occurs as water evaporates.
Chemical Composition
Polyethylene Glycol (PEG)
Reduces surface tension of water leading to lower shrinkage during the drying phase.
Propylene Glycol
Reduces water surface tension and minimizes shrinkage in concrete.
Alcohol-based Compounds
Effective in reducing shrinkage by controlling water evaporation rate.
Surfactants
Non-ionic surfactants decrease water surface tension, controlling shrinkage.
Performance Benefits
Reduced Cracking
Minimizes shrinkage to prevent crack formation, enhancing durability and structural integrity.
Improved Durability
Less cracking means improved long-term durability as cracks can allow harmful substances.
Enhanced Aesthetic Quality
Fewer surface cracks ensure a smoother, more visually appealing finish.
Better Performance in Large Pours
Especially beneficial where shrinkage can cause significant cracking.
Applications
High-Performance Concrete
Critical for structural performance and durability where low shrinkage is needed.
Large Slabs & Pours
Essential in large slab constructions where shrinkage leads to significant cracking.
Bridges & Infrastructure
Ideal for bridge decks where shrinkage-induced cracking could compromise performance.
Decorative Concrete
Maintains aesthetic quality by minimizing surface cracks.
Frequently Asked Questions
How do SRAs work?
By reducing the surface tension of water in the capillary pores, SRAs decrease tensile stresses that cause shrinkage, reducing the likelihood of cracking.
Can SRAs be used with other admixtures?
Yes, SRAs are typically compatible with water reducers, superplasticizers, and other admixtures for versatile applications.
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