Technique for Packing Edges on Pressed Concrete

Mix Type

• Two primary types of concrete mixes are used when working on intricate pressed concrete projects, like concrete countertops. Stiff mixes are more like putty, and use only sand as the primary aggregate material. This allows for more compact corners and edges. The other type is a fluid mix, which includes more liquid and larger aggregates like pebbles. In this case, the fluid cannot be water, which does not make strong pressed concrete, but rather plasticizers.

Trowel Work

• For simple packing jobs with concrete, a trowel can be the best tool. In this case, you can use a trowel or another similar type of edging tool. Press the trowel firmly along the edges of the frame holding in the concrete, creating an even and firm set. This process works well in combination with screeding and leveling steps for larger pressed concrete projects, such as walkways, patios and slabs.

Hand Work

• For highly detailed pressed concrete, working by hand can sometimes be better than using a trowel. This allows for more custom packing work. By mixing colors and textures you can help concrete to mimic stone patterns or create new patterns of your own. This type of pressing is usually done in a mold that will be used for curing until the concrete is transferred to a counter or fountain.

Second Mix

• For tricky projects and highly compact concrete that is supported with fibers, two different mixes may be used. The first mix forms the bulk of the concrete mix and the primary base. The second mix is a wetter version that is piled on top of the fiber concrete. The wetter mix is easier to form, pack and smooth, making it ideal for custom projects.