- Concrete Slurry Mix for filling in any imperfection or holes in concrete surfaces.
- Contains a blend of Portland Cements, Cenospheres, and Pozzolan.
- (Cenospheres act as miniature ball bearings, allowing the slurry to fill small pinholes easier, and act as a bonding surface for the cements to reduce shrinkage and cracking of the slurry)
- Just add water. For a stronger slurry and better bonding, replace water with a water mixture consisting of 1 part Polymer to between 5 and 10 parts water and a tiny amount of Plasticizer (see below for more info).
- Slurry mix can be pigmented before application, or stained once applied and cured.
- Available in both Gray and White cement.
- Size: 3 lbs of slurry (approx. 1/2 gallon)
- Color: Available in Natural Gray Cement, and White Cement.
- Coverage: Coverage rates vary depending upon size and number of voids to be filled. 3 lbs of slurry could cover 50 sq. ft. if there are lots of larger voids, or 1000 sq. ft. if there is minimal pinholes only.
- Contains Portland Cements, Cenospheres, and Pozzolan.
- Preparation: Polish, grind, or sand the concrete surface to open any voids in the concrete that may have just a super thin covering of cement over them. Wet concrete surface before applying the slurry, but do not over do it. Just keep the concrete damp as you work- no standing water.
- Coloring: If coloring the slurry, mix the color into the slurry in the same ratio as was used on the concrete mix. White slurry is often used to contrast the concrete color, making the slurry filled areas a different, or 'brighter' color.
- Tip: Gray 'concrete' will usually dry to a lighter gray color. Filling voids with Gray Slurry can result in darker areas where the higher cement content slurry fills. Some people like to get both Gray and White Slurry, and mix some White into the Gray, before using, to create a lighter slurry to better match natural gray concrete (test a small area with this process and let dry to determine if you need more, or less, white cement mixed in.
- Mix: Put a small amount of Slurry Mix into a mixing container, and add small amounts of water (or water/polymer mixture: see below) until the mixture looks like thick peanut butter.
- Optional: For a stronger slurry, and better bonding, consider using a mixture of 1 part Acrylic Polymer (Duraplex, sold here) to between 5 parts and 10 parts water instead of just straight water. If you have a superplasticizer/water reducer (Riteks Evo-Tek 7015) you may also want to add a tiny amount of this too.
- Example mixing batch: Put 1 cup slurry (measuring cup) into a container. In another container, add 1 oz Polymer and 5 oz water, and stir. Use some of this mix water and small amounts at a time to the slurry and stir until a thick dough forms. If you have the Plasticizer, add a drop and stir. If needed, add another drop. Slurry should look like thick peanut butter, NOT RUNNY! If you don't have Plasticizer, just add small bits of the mix water until the mix goes from 'dough' to 'peanut butter'.
- Apply: Concrete surfaces MUST be damp BEFORE applying slurry. Mist with water (don't flood) any area right before you apply the slurry. Using a putty knife or your fingers (use Rubber Gloves), work the slurry into the concrete. Working the slurry in one direction with a putty knife, and then pulling across the same area in a different direction will ensure the best fill. On large voids, the slurry should be left a little thicker, as it will shrink down some as it dries.
- Finishing: Allow slurry to dry at least a few hours before attempting to sand. Usually using 200 grit sandpaper by hand, or on a palm sander, will work well. If wet polishing, allow the slurry to dry a day or more first. Once sanded, determine if another slurry coat is needed. Multiple coats of slurry are often necessary to obtain a completely flat concrete surface.
- Staining and Sealing: Slurry should be allowed to dry at least 24-48 hours before staining or sealing. Most stains react to the cement in concrete, so areas of high cement content, such as a hole filled with slurry, will generally stain darker than concrete around it that usually have a lesser cement ratio. With all color and staining, doing a test batch or area is recommended.