At Carroll’s Building Materials we like to recommend time test materials when ever possible. Tuf-Link has been used on thousands of projects over the past 25 years. Over time modifications to the formula and manufacturing process have been made to improve specific performance parameters but the basic chemistry remains the same. Tuf-Link is definitely “time tested” and often specified when severe conditions are anticipated.
Tuf-Link when applied will look like a milky white low viscosity liquid. When cured it becomes a very tough clear plastic like material which is water and chemical resistant, flexible, and moderately elastic. Due to its water like viscosity not only fills the significant concrete voids but it also penetrates deep into the small concrete capillaries creating an extremely secure, water tight and strong bond. When used both as an admixture and bonding adhesive it combines chemically with itself for even greater strength.
Cement based products require the presence of water to properly cure. The use of Tuf-Link as a bonding agent prevents the substrate from absorbing water from the concrete which increases the time the water is available to cause the cure. The use of Tuf-Link as an admixture also slows the release of the water from the voids and capillaries of the concrete reducing or eliminating the need for external wetting during the curing period.
Surface Preparation – Application of Tuf-Link requires that all surfaces be sound and not subject to temperatures below 45ºF or above 95ºF. Surfaces must be free of all grease, oil, dirt, dust, mildew, curing compounds, sealers, coatings, form release, efflorescence, old adhesives residue, gypsum based underlayment’s, and other foreign matter. Slick or sealed surfaces must be thoroughly roughened; new concrete should be allowed to cure. If a surface is questionable, apply test patch of Tuf-Link; allow it to dry thoroughly and check to be sure there is absolutely no curling or peeling. Before application, area should be damp with excess water removed.
Timing – Tuf-Link is a non-rewettable acrylic free latex based emulsion copolymer concrete bonding adhesive and admixture. An optimum bond is only achieved if the material to be bonded is applied before the Tuf-Link cures beyond its “tacky” state. If Tuf-Link becomes dry a new coat of Tuf-Link should be applied before applying the material to be bonded.
Apply Using – Tuf-Link is used as a Primer/Seal Coat, as an Admixture, as a Coat on Bond, and as a Slurry or Dash Coat Bond. As a bonding agent or sealer Tuf-Link may be applied by Roller, Spray, or Brush. It’s low viscosity make spraying a viable option.
- Primer/Seal Coat – Tuff-Link may be diluted 1:1 with water and applied to properly prepared substrates to seal in salts, efflorescence and other impurities that leach from cement based products interfering with strong bonds.
- Coat on Bond – used full strength to waterproof and to add strength and elasticity to the concrete bonds. (Meets ASTM C 1059 Type II performance requirements.
- Admixture – When Tuff-Link is used as an admixture to cement based mixes it creates a concrete curing characteristic that is essential to complete hydration of stucco, mortar, and other thin coat applications of Portland cement mixes or plasters. Tuf-Link also inhibits water penetration, reduces cracking, and strengthens and promotes bonding. As an admixture it is added in place of a portion of the water in accordance with the manufacturer’s instructions.
- Slurry or Dash Coat Bond – Two parts Tuf-Link and one part water combined with Portland cement and sand should be used to create a slurry for use under placement of cement coatings of ½ inch thickness and above to provide a superior bond and greater water resistance.