The concrete mixer (also often referred to as a cement mixer) is a machine that homogeneously mixes cement, aggregate, such as gravel or sand, and water to make concrete. An average concrete mixer utilizes the revolving drum to mix the ingredients. Mobile concrete mixers are commonly employed for smaller-scale projects to ensure that concrete can be mixed on-site, giving workers plenty of time to work with the concrete before it forms. A different option to a mixer is mixing cement or concrete manually. This is typically done using wheelbarrows, but numerous companies recently began to market modified tarps specifically for this purpose.
Today's market is increasingly demanding consistent consistency and quick mixing times for industrial production of ready-mix concrete and precast and prestressed concrete. This has led to the improvement of mixing technology to produce concrete. Different types of stationary mixers have been created, each with its unique strengths that target different segments of the concrete production industry. The most popular mixers used currently fall into three groups: Twin-shaft mixers, Vertical-axis mixers (Pan and Planetary mixers), and Drum mixers (Reversing Drum and Tilting Drum).
Twin-shaft mixers are renowned for their intense mixing and their short mixing time. They are usually employed for concrete with high strength, RCC and SCC, usually in batches of between 2 and 6 meters. Vertical Axis mixers are often used to mix precast and prestressed concrete. This kind of mixer is clean well between batches and is favored for colored concrete small batch sizes (typically 0.75-3 millimeters) and numerous discharge points. In this class, the Pan mixers are losing traction to much more effective Planetary (or counter-current) mixers since the extra mixing process aids in the creation of concrete mixes with more important properties (color consistency SCC, color consistency.). Drum mixers (reversing drum mixers and inclined drum mixers) are employed when huge amounts of concrete are made (batch dimensions of 3-9 millimeters). This mixer is the most popular in the market for ready-mixed products because it can produce high speeds and is suitable for concrete slumps and in cases where the production cost is essential. Drum mixers have the lowest operating and maintenance cost among the three kinds of mixers, and the drum mixer is the most cost-effective. Each mixer type possesses its unique strengths and weaknesses, and the three kinds of mixers are in use all over the world, with various degrees of success.
Concrete mixing truck for transport
The special concrete transportation truck ( in-transit mixers) is constructed to mix and transport concrete to the building site. They can be loaded with water and dry materials, and the mixing takes place in the course of the transport. This means that the concrete has already started mixing. The concrete mixing truck keeps the concrete in its liquid state by agitation or turning the drum up for delivery. The drum's interior on a concrete mixer is equipped with an incline blade. In one direction of rotation, concrete is pushed further into the drum. The drum rotates while the concrete gets moved to the construction site. This is referred to by the term "charging" mixing equipment. Suppose the drum is rotating in the opposite direction; the Archimedes screw-like arrangement "discharges" or pushes concrete out of the drum. The concrete flows into chutes that direct the viscous concrete to the worksite. Suppose the truck isn't close enough to the location to access the chutes. In that case, the concrete can be discharged through a concrete pump linked to an irresistible hose and then onto conveyor belts, which can be extended for a specific distance (typically ten or more meters). Pumps can transport the concrete to specific locations, multi-floor buildings, and other too far away locations.
The drum is usually constructed of steel; however, on some modern trucks, to reduce weight measure, fiberglass is utilized.
Concrete mixers have anything from two axles up. Six, five, and four axles are most commonly used, and the amount is set by the load and local legislation that governs the maximum load allowed on roads. They are required to distribute the load uniformly, permit operation on weight-restricted roads, and lessen damage to regular roads. In winter, a three- or two-axle truck in which road limits for weight are lowered is no useable payload in several regions. In other areas, you may need expensive licenses to run.
Other axles, different from those that are used to steer ("steers") and drives ("drives"), could be put in between the drives and steers as well as behind them. Mixer trucks usually have multiple steering axles, which generally have a huge turning radius. To make it easier to maneuver, the additional axles can include "lift axles" that permit them to be lifted off the ground so they don't scrub (get dragged sideways across the ground) when turning in sharp turns or expand the radius of turning. The axles attached to the drives are referred to in the industry as "tag axles" or "booster axles." They are typically equipped to pivot in the opposite direction to the steering axle to minimize scrubbing automatically lift when the truck is placed in reverse gear.
Combination mixers for tractor-trailers in which the mixer is mounted on a trailer rather than truck chassis are utilized in some areas, for instance, in Canada's province of Quebec in Canada in which even six-axle trucks might have difficulty transporting a load. They are also used in large areas as mixers for transit from the batch plant to paver train for concrete roads or to supply large volume pours like dams and bridges to decrease the number of trucks required.
Concrete batching plants typically aren't far away from their facility since the concrete begins to set when placed in the truck. Some contractors require that the concrete is in place within 90 minutes following the loading. If the truck is damaged or has a reason other than that the concrete begins to harden inside the truck, employees might have to go into the barrel with jackhammers and get it out if it's been set.
Concrete mixer trailer
A variation of the standard concrete transport is the cement or concrete mixing trailer. These smaller versions of a transit-mix truck can be utilized to transport short amounts of concrete. These trailers with a cart-away design have a concrete mixing drum anywhere between one yard to 1.75 yards. They are typically driven by a pickup truck and are batched from small batching equipment. Mixing trailers are well-liked by rental yards and places for building materials that make use of them to deliver ready-mix for their existing clientele.
Mixer and placing units
Some trucks come equipped with a built-in pump and boom to place the concrete horizontally or vertically away from the truck using a joined hydraulic boom and flexible pipes. A larger, more mobile truck-mounted boom can be purchased in separate units.
Certain units come by a mobile conveyor that can reach up to 10 meters. This can be useful to place near a highway or in a building that has little headroom.