Ready-mixed concrete is an essential component of every concrete building job. A stationary mixer is used to mix concrete at a central mixing facility. The concrete is subsequently loaded into the transport truck. All unmixed dry components are loaded into a truck mixer at a truck mixing plant. The mixture is then transported back to the central station where it is dumped into a hopper for delivery to the work site.
A ready-mix concrete plant is required to produce enough concrete to fill trucks on a continuous basis. These large plants use heavy machinery such as bulldozers, loaders, and trucks to combine the dry ingredients with water at the production site.
The finished product is then delivered to the construction site by truck for use in buildings and other structures.
These mobile plants include a mixing unit with rotating drums that break up any hardened chunks of concrete before they can be poured into another container for delivery to a job site. The mixing head also includes a device that ensures even distribution of additives within the drum while the material is mixed.
The mixing plant requires a large amount of space to operate. Therefore, these facilities are usually located away from the construction site to avoid interfering with the job schedule. However, this distance makes delivery of the concrete more difficult since it must be transported to both the location of manufacture and placement in the structure.
Materials for transit-mixed (also known as truck-mixed) concrete are batched at a central facility and entirely mixed in the truck while in route. Transit-mixing separates the water from the cement and aggregates, allowing the concrete to be mixed shortly before placement on the job site. The water added during transit mixing must be clean tap water without any additives or admixtures. It is important that the water used to mix the concrete is free of sediments and other impurities that could affect its ability to set properly.
Concrete placed in this manner will not have the same long-term durability as place-mixed concrete, but it does provide immediate strength and workability. The concrete's shorter setting time also allows workers more time to complete other tasks while still providing sufficient time for the concrete to reach its full strength.
Transit-mixed concrete is used where quick placement and maximum output are essential. This type of concrete can be used for driveways, parking lots, and sidewalks. It can also be used for small structures such as flatwork and steps since it can be placed almost immediately after it is mixed.
Place-mixed concrete is mixed by hand or with mechanical equipment on site prior to use. This gives the mixer operator more time to adjust the mixture for different types of applications and to incorporate additional materials into the mix. For example, dry sand can be added to increase the density of the concrete if necessary.
Ready-to-use concrete is a ready-to-use substance composed of cement, sand, aggregate, and water. RMC is a form of concrete that is mixed at a batching plant according to the customer's specifications and supplied to the construction site using a transit mixer as it is mixed away from the construction site. At the site, the mixer drops balls of concrete into a hole or mold, where they gradually combine with other balls or pellets to form the finished product.
The key advantage of RMC is its fast installation time, which can be as low as six hours for a four-foot by eight-foot slab. It also has the potential to produce a stronger final product due to less air entrapment and fewer voids. However, this advantage may not be significant for small projects or for uses where quality rather than quantity is important.
Another advantage is the ability to use off-the-shelf equipment to mix and transport the concrete. This reduces cost compared with other types of concrete that require special equipment for mixing and transporting.
Finally, RMC offers greater design flexibility than other concrete types because it does not have to be poured in forms before it sets. This allows for changes to be made during construction without having to destroy the old material.
As you can see, RMC has many advantages over other concrete types, some of which include speed, strength, design flexibility, and cost.
A concrete mixer (also known as a cement mixer) is a device that mixes cement, material such as sand or gravel, and water to produce concrete. To mix the components, a standard concrete mixer employs a spinning drum. The drum includes paddles or beaters that rotate when the engine is started.
For most applications, it is sufficient to use a hand-held electric or air-powered mixer. These mixers are useful where there is not much space or where multiple batches must be mixed at different times. They can also be used in small quantities if necessary. Hand-mixing concrete leaves more control over the concrete mixture's properties and reduces the risk of contamination from hardened cement particles.
For larger projects or areas where hand-mixing is not an option, concrete mixers are used instead. These machines include a motor attached to a drum, with paddle or blade systems on the inside surface of the drum to mix the concrete. Concrete mixers are available in two main types: drag-type mixers and rotary-type mixers. Drag-type mixers have a pair of rear wheels and a front-end loader that pulls them through the concrete. Rotary-type mixers have an internal rotational mechanism that works with an external drive unit to mix the concrete.