Concrete Crack and Spall Repair Guide
Highways across the world struggle with Concrete Cracks and Spalls. For a fast and stable concrete spall repair, use FlexSet with a bucket mixer. The polymer-based concrete spall repair works in areas where there is a lot of movement, damaged base or where other concrete repairs materials have failed. With no saw-cut or demolition required, the preparation is quick and easy.
Sweep or blow out damaged concrete spall repair using a push broom, blower or compressor. Place the 5-gallon pail of FlexSet on the Roklin motorized pail mixer, ensuring the pail is secure in the correct slots. Begin by pouring the supplied 30 pounds of specially coated aggregate into the pail. Next, carefully pour the contents of bottle “A” into the 5 gallon pail, making sure it doesn’t splash out. After shaking the contents of bottle “B” for 20 seconds, pour the contents into the 5 gallon pail. On cold days or when there is little time for the repair, supplied catalyst may be added to speed the reaction.
Spray a light coat of vegetable oil on the paddle in order to keep the paddle clean. Place the paddle in the pail, turn on and mix for one minute before adding aggregate.
Next, add 25 pounds of Roklin Black Diamonds 3/8″ aggregate and mix for one minute. Pour into concrete spall, which can be filled to grade, as material is free-flowing and self-leveling. The FlexSet polymer slurry can now be feathered into the existing concrete, ensuring a smooth ride. Broadcast the supplied 12-pounds of topping sand over the area to create a high-traction surface. Once fully cured, the concrete spall repair can be returned to traffic, sometimes in less than 30 minutes.
Concrete Crack Repair
Concrete cracks are caused by many things– earthquakes, water, tree roots, frost heaves, poor placement of seams between concrete slabs, even cement mixed with too much water. Whatever the cause of your concrete cracks, polyurethane repair product can give you a stronger, faster, concrete crack repair than anything else available. There are two sizes of cracks covered below—hairline, which can be repaired with Concrete Welder in cartridge format and regular which can be repaired using FlexSet.
It is essential to deal with concrete crack repair as soon as you notice a crack appear. Concrete cracks may start small, but if left unrepaired, are guaranteed to grow larger. If cracks become too large, or there are too many, the concrete may need to be replaced rather than repaired.
Hairline Cracks
Filling smaller concrete cracks can be done simply using Concrete Welder, available in a cartridge format. Make sure the crack is clean and free of moisture. Open cartridge and squeeze Concrete Welder directly into the crack. Use a scraper or straight-edge to smooth the Concrete Welder out. Sprinkle topping sand onto repair. Wipe up any excess material and allow to dry for 30 minutes. Now the crack is filled and ready for use.
To repair a larger crack in concrete that is quickly widening, use Roklin’s FlexSet Concrete Repair Product. FlexSet provides a fast-setting repair that will be a stronger concrete crack repair with almost no interruption of service.
First ensure that the concrete crack repair is clean and dry. Sweep or blow out cracks so there is no loose debris. Place the aggregate provided in the FlexSet package to fill in the deeper area of the crack, without going above the damaged area. Using FlexSet, carefully pour contents of bottle “a” into provided 5-gallon bucket then add special sand. Next, shake bottle “b” thoroughly and pour into sand mixture. (Catalyst can be provided when temperatures are colder or a faster setting time is needed.) Mix with a paddle-mixer, using a drill. When mixture is completely wet, pour FlexSet onto damaged area and use a trowel or lute to smooth material into cracks. When cracked area becomes smooth, toss topping sand by hand over repaired area to create a uniform look and feel. The new repair can be ready in less than an hour.
FlexSet and Concrete Welder are available for purchase through the Roklin web site at www.roklinsystems.com or call 1-888-FlexSet. Other concrete and asphalt repair materials for large and small repairs are also available.
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