TETRAGUARD® AS 20  

Tetraguard AS20 shrinkage-reducing admixture is the first commercially available chemical admixture developed specifically to reduce drying shrinkage of concrete and mortar, and the potential for subsequent cracking.

Tetraguard AS20 admixture has been used successfully in the Far East and North American construction markets since its introduction in 1985.

Tetraguard AS20 admixture was developed to replace/enhance inorganic expansive admixtures that were being used to prevent drying shrinkage cracking. These expansive admixtures acted by inducing compressive stresses in concrete to offset tensile stresses caused by drying shrinkage.

Tetraguard AS20 admixture functions by reducing capillary tension of pore water, a primary cause of drying shrinkage.

Features

• Significantly reduces drying shrinkage by as much as 80% at 28 days, and up to 50% at one year or beyond when 2% Tetraguard AS20 admixture by mass of cement is used in the concrete mixture
• Reduces stresses induced from one-dimensional surface drying in concrete slabs and floors
• Reduces compressive creep
• Reduces carbonation

 Benefits

• Reduces drying shrinkage cracking and microcracking thereby improving aesthetics, watertightness and durability
• Reduces compressive creep under drying conditions that minimizes prestress loss
• Minimizes curling