Vetorep CR521

Cut back all damaged & weak concrete until you reach a sound surface. You can also cut back the application’s minimum depth. 

Grit blast corroded steel reinforcements to remove all rust traces. Compensate steel loss with up to 25% of the original section; Replace the steel reinforcement for section losses that exceed 25%. 

Remove all concrete forms around at least 25 mm of the exposed steel reinforcements. Saw cut the perimeters of the repair area to a minimum depth of 10 mm. Clean the prepared area thoroughly using a brush and/or compressed air. 

Use a water-tight form-work to avoid material loss. Soak the areas to be repaired with Vetorep CR521 with clean water for several hours before applying the Vetorep system. Remove all excess water. 

For the steel reinforcement to accept Vetorep CR521, it must be primed ( with one or two coats of Saveto corrosion inhibitor for steel reinforcement Vetoprime CP436) & grit blasted within 2 to 4 hours. 

Normally, a primer is not required, provided the substrate is soaked thoroughly in clean water (and it is damp when applying the product). 

For concrete that’s highly contaminated with soluble salts, it is recommended to use Vetobond EB430 (an epoxy bonding agent) to prevent migration of salts (such as chloride ions and sulfate) to the repair patch. It also provides an enhanced bond for The Vetorep CR520 to host concrete. 

Mix properly using a mechanical power mixer or drill fitted with a suitable paddle. Add 2.75 - 3.25 liters of clean water to a clean container. Then add the powder slowly to the water while continuously mixing (with a low-speed mixer/drill, 400 - 600 rpm). Mix for 3 minutes until a uniform consistency is achieved. 

Pour Vetorep CR521 in a single continuous operation within 25 minutes of mixing. Pour the mixed material slowly to prevent air entrapment. 

Vetorep CR521 is a cementitious-based material and can be cured like concrete by continuous watering and covering with polyethylene sheets. Alternatively, you can use Vetobond AB432 for curing. 

Clean all tools with freshwater immediately after application. Clean hardened materials mechanically.