Why Do Cement Trucks Spin?

Typically, cement trucks spin to mix concrete. During mixing, the concrete is in constant motion, and the truck must keep up to keep the mixture from hardening. The truck rotates in one direction, while the concrete is mixed in the opposite. This is referred to as counter-rotation. Without it, the concrete would not be adequately mixed and could become too stiff or fluid. Counter-rotation also prevents concrete from settling, which can occur if left standing for too long.

How Fast Do Cement Trucks Spin?

A clutch inside the truck’s cab allows the driver to regulate the rate of rotation. The speed varies depending on whether or not the concrete was thoroughly mixed before it was loaded into the truck or whether or not the truck was required to do the majority of the mixing. But typically, the mixing speed is 1.57 rad/s (15 rpm), whereas the rate that is usually used for transporting pre-mixed concrete ranges from 0.2 rad/s (2 rpm) to 0.6 rad/s (6 rpm). Additionally, cement trucks have six-cylinder engines that produce around 300 horsepower, allowing them to spin quickly and haul a heavy load without overworking the engine.

Notably, there are various types of cement trucks, each with a different spinning speed. The faster a truck spins, the more cement it can hold. The federal government’s maximum speed limit for trucks is 60 miles per hour, but many states allow trucks to go even faster. Besides, it is how does a cement truck work that is important, not how fast it can spin.

Why Do Cement Mixers Turn Anti Clockwise?

Cement mixers turn counterclockwise since the mixer’s blades tend to hurl the wet concrete against the drum walls. This ensures the concrete is well mixed and avoids drying out or sticky mixtures. Finally, after mixing, the drum is discharged by turning it counterclockwise.

Why Are There Wheels on Top of a Cement Truck?

Since cement trucks are large and heavy vehicles used to transport concrete from the batching plant to the construction site, they require a specialized chassis that is different from other types of trucks. One of the most notable features of a cement truck is the set of wheels that are located on top of the vehicle. These wheels, known as auxiliary wheels, help to support the weight of the truck, safely transport its load, and keep it stable on the road. In addition, it helps distribute the concrete’s weight evenly across the truck’s body. The wheels on top of cement truck tanks usually rotate during mixing. The purpose of the wheels is to keep the tank from tipping over when it is stopped and to mix the concrete as the truck moves.

How Long Can You Keep Concrete in the Truck?

In cool or wet weather, concrete can take several hours to harden. This means that if you’re pouring concrete in cool weather, you need to be able to keep it from hardening long enough to get it into place. But, if the concrete starts to set too quickly, you won’t be able to keep it in the truck for very long. If the conditions are ideal and the concrete isn’t hardening too fast, you should be able to keep it in the truck for up to two hours. After that, it will start to harden and needs to be placed as soon as possible. Thus, it’s essential to plan when pouring concrete in cool weather. By being prepared and knowing how long you can keep the concrete in the truck, you can avoid any delays or issues.

Why Do Cement Trucks Have a Small Chute?

Cement trucks have a small chute to pour concrete into forms, such as the foundation of a building. It helps to ensure that the concrete is poured into the state in a controlled and precise manner without spillage. If the cement truck had a large chute, it would be more challenging for the concrete to flow and more likely to spill. Additionally, it helps to prevent the concrete from hardening too quickly. If the concrete came into contact with the air, it would start to set and quickly become unusable. By keeping the concrete in a closed system until it is ready to be used, cement trucks help to ensure that the concrete stays fresh and usable for longer.

What Do Concrete Trucks Do With Extra Cement?

When a concrete truck finishes a job, it often has extra cement in the tank. The truck driver has a few options for what to do with this leftover cement. One option is to clean out the tank at the next job site. Another option is to find a local dumping ground where the excess cement can be disposed of. However, this is not always ideal, as it can be expensive and time-consuming. Furthermore, the most common solution is to return the extra cement to the mixer plant. The cement can be used on other projects or returned to storage for future use. With this system, there is very little waste, and concrete truck drivers can rest assured that their leftover cement will not go to waste.


Indeed, a cement truck is valuable in speeding the process of mixing the concrete compared to manual labor. It’s usually spun because it helps evenly distribute the concrete’s weight and keeps the concrete from hardening too quickly as the water in the mix evaporates. However, the rate at which this happens depends on temperature and humidity levels. In addition, a cement truck has a small chute and a wheel on its top to evenly distribute the concrete’s flow, prevent spillage, and help support the truck’s weight.

About the author, Laurence Perkins