There are two primary steps to pouring exposed aggregate concrete, according to the Concrete Network. The base concrete is mixed and then poured into slab form using a shovel or concrete mixer, where it is struck off and bull floated. The decorative aggregate is then spread over the slab by hand or shovel until it covers the top of the slab and the embedded top using the bull float.Know More
According to the Concrete Network, an alternative to the two-step method is to mix the decorative aggregate directly into the concrete base and pour both elements into slab form. A less expensive alternative involves mixing the aggregate with concrete and spreading a thin layer of the mixture over an already-poured slab. The thin layer should be between 1 inch and 2 inches thick.
In all instances, once the aggregate is poured, it must be exposed as a final step. The aggregate can be exposed by washing the thin film of concrete off the stones with water and then brushing the slough away with a broom. The time allowed between laying the aggregate and exposure can be extended up to a day by spraying the surface with a chemical retardant that prevents the thin film of concrete on the aggregate from drying.Learn more about Building Materials
The density of normal concrete is about 145 pounds per cubic foot. The density of concrete is determined largely by the type of aggregate used in the mixture. The density of the cement used in the mix can also affect density, with compressed, vibrated cement creating a denser concrete mix.Full Answer >
Lean concrete is a mix where the amount of cement is lower than the amount of liquid present in the strata. This makes it ideal as a base layer where other kinds of concrete are placed on top. It is good for providing a flat bottom in uneven or dirt terrain.Full Answer >
The depth of footings is determined by the depth of the frost line. The top of the footing must be poured below the frost line to maintain stability.Full Answer >
Cut concrete by consulting the home's mechanical prints to determine any obstacles, using a diamond blade on a circular saw to make the cut and breaking away the cut concrete with a sledge. The cutting process is slow, and cutting through a concrete floor should be the last resort.Full Answer >