Concrete delivery-an important part

Introduction to concrete delivery

Concrete delivery is an important part of concrete engineering.

Moreover, concrete is the product of a concrete mixing plant.

And in road engineering, construction projects, and some water conservancy projects, people need to use concrete.

However, geographical conditions will restrict the construction of some projects.

Therefore, there will be a distance between the concrete mixing station and the construction site.

In this situation, people need to transport the concrete to the construction site.

In general, during transportation, concrete may cause delamination, cement slurry loss, slump change, and initial setting.

Therefore, people must take corresponding technical measures to ensure the quality of the concrete mixture.

Next, let’s take a look at the specific information on concrete delivery.

What is concrete delivery?

Concrete transportation refers to the process by which people transport concrete from the mixing station to the pouring point.

Moreover, to ensure the construction quality of concrete, people’s basic requirements for the transportation of concrete mixture are:

1. No segregation phenomenon
2. No leakage
3. Ensure the specified slump during the pouring
4. People have sufficient time to pour and compact the concrete before the initial setting.

Moreover, the homogeneous concrete mixture is an elastoplastic body between solid and liquid.

And the internal friction, cohesion, and gravity acting on the aggregate are in a balanced state.

Therefore, they evenly distribute in the concrete mixture and they are in a fixed position.

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Problems we need to avoid during concrete delivery

During transportation, due to the turbulence and vibration of the transportation tool, the cohesive force and internal friction resistance will be significantly weakened.

And this makes the aggregate out of balance.

Therefore, they sink under their weight.

Moreover, the greater the quality, the stronger the tendency to sink.

And this trend is due to the different quality of coarse and fine aggregate and cement slurry.

Therefore, they will each gather at a certain depth.

And this formed the phenomenon of stratification and segregation.

Moreover, it is harmful to the quality of the concrete.

Therefore, the transportation road should be flat.

And people should select transportation means appropriately.

Moreover, people must limit the transportation distance.

And these prevent the concrete from delamination and segregation.

If the concrete has segregated, people need to mix it twice before pouring.

In addition, the tools for transporting concrete need not absorb water and do not leak slurry.

Moreover, people must limit the transportation time.

If the transportation distance is long, people can choose a concrete mixer truck.

In this way, people can first load the prepared concrete dry material into the concrete block.

Then, when approaching the scene, people added water to mix.

And this can avoid the loss of concrete slump caused by long-distance transportation.

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Transport colored concrete

Usually, people transport colored concrete in the same way as standard concrete.

However, standard concrete is easily mixed with colored concrete.

Moreover, the mixing ratio is between 10% and 30%.

Therefore, people need to dye dry concrete before shipping.

Or, people can pay extra for other color trucks.

As for its specific price, it will cost about $600 on average for a two-color driveway with a length of 10 x 20 feet.

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Concrete delivery time

The transportation time of concrete refers to the time between all unloading from the machine port and unloading the concrete into the warehouse.

And then, people transport the mixed concrete to the pouring site as quickly as possible.

Moreover, people poured it into the mold. And this avoids condensation.

Therefore, the total time for people to mix the concrete and finish pouring should not exceed the initial setting time of the concrete.

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Transportation plan and method for concrete delivery

The volume of concrete transportation is huge.

Moreover, people must transport them to the pouring site as soon as possible.

Meanwhile, during the transportation of concrete, people must ensure that the concrete does not separate.

Moreover, its slump loss cannot be too large.

Therefore, the concrete transportation plan and method are very important.

Generally speaking, when choosing a transportation plan, people should consider the following factors:

1. Local equipment and technical conditions
2. The characteristics of the project, such as the size,distribution, and coordination of the concrete volume, etc.
3. Vertical and horizontal transportation distance
4. How to ensure the quality of concrete
5. Reduce labor intensity and ensure worker safety
6. Local climate and terrain conditions
7. Economic rationality
8. In order to avoid the delamination and separation of concrete, the transportation road should be flat. And this ensures the smooth running of transport vehicles. Moreover, this minimizes the numberof transfers.
9. If concrete is stratified and separated, people should perform a second mixing of concrete before pouring.
10. The transportation of concrete must be tight and seamless. And this avoids slurry leakage. Moreover, this affects the quality of concrete.
11. When transporting concrete in harsh climates, people should prepare to cover equipment for transportation means, transportation routes, and pouring points when necessary. And this avoids the increase of concrete water consumption due to water evaporation.
12. When choosing a transportation plan and arranging transportation routes, the form, plane shape, and elevation of the building should also be considered.

Above all, the best solution is to ensure that people can directly transport concrete to every part of the project. Meanwhile, people should try to avoid second dumping.

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Transportation

There are many types of concrete vehicles. Moreover, the transportation method is also different.

Commonly used transporters include single-wheeled trolleys, two-wheeled rack trucks, dump trucks, automobiles, belt conveyors, tower cranes, gantry cranes, and pumped concrete.

Moreover, people use special mixer trucks to transport commercial concrete from the mixing station to the pouring site.

Next, let’s take a look at the different uses of different transportation tools.

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On-site mixer truck for concrete delivery

People use on-site mixer trucks for on-site concrete delivery.

Moreover, people carry out the process of concrete adding water to solidify at the construction site.

Usually, people use trucks to transport concrete from the factory to the construction site.

Among them, the fixed-line process is performed on the road.

However, if the volume of concrete is large, people need to carry out the curing process on site.

At this time, people need to use on-site mixer trucks to transport concrete.

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Small concrete mixer truck

The professional small concrete mixer truck can transport 1 cubic yard to 3 cubic yards of concrete.

Moreover, it can provide short-load high-quality ready-mixed concrete.

Trolley transportation for concrete delivery

In the horizontal transportation of small projects, people use rickshaws such as unicycles or rack trucks to transport concrete.

Moreover, the single-wheel trolley is suitable for transportation distances of 30-50m.

Meanwhile, the two-wheeled vehicle is suitable for the transportation distance of 100-300m.

Besides, the longitudinal slope of the road surface is generally not more than 15%, and the climbing height is generally not more than 2-3m.

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Dump transportation for concrete delivery

The dump truck can unload the concrete directly at the pouring site or in the chute.

In this way, people can pour concrete through buckets. Moreover, according to the progress of the pouring work, people can move the track.

And as for the track, it needs to be leveled.

So, this can avoid the bumpy driving of the dump truck and cause the concrete to separate.

Speaking of transportation distance, manpower pushing dump truck is suitable for a distance of about 300m. Meanwhile, locomotive traction is suitable for transportation distances within 400-1500m.

And when the track gradient is greater than 0.6%, people need to install gates on the track.

So, this can prevent accidents.

Dump truck transportation for concrete delivery

Sometimes, the volume of concrete transportation is large and the transportation distance is relatively long. At this time, people will use dump trucks to transport.

Moreover, its body is airtight to facilitate moisture retention. Therefore, mixing stations are generally transported by mixing dump trucks.

When the concrete transportation volume is large and the transportation distance is long, people often use the dump trucks.

Now the mixing stations use a mixing dump truck to transport concrete. And the car body is airtight. So it is convenient for heat preservation and moisture retention.

When people transport the concrete vertically, people can unload the concrete directly into the bucket of the truck at the mixing station.

Moreover, after concrete arrives at the construction site, people use a crane to hoist the concrete to the pouring site.

And then, people opened the trap door at the bottom of the bucket and unloaded the concrete into the model.

Rope crane transportation

In large hydro-power projects, people use cable cranes to pour concrete dams.

Moreover, people use buckets to transport concrete. And the height between the bucket exit and the concrete silo surface cannot exceed 1.5-3m.

Meanwhile, using trucks and buckets to transport concrete, people do not need to carry out secondary transportation. And this not only guarantees the quality of concrete but also helps keep warm during winter construction.

However, when using this method of transportation, people must equip sufficient lifting equipment.

Otherwise, this will affect the transportation efficiency of the car.

Belt conveyor transportation for concrete delivery

When transporting on horizontal and ramps, people use belt conveyors to transport concrete.

Moreover, it is suitable for large-volume concrete construction projects.

And if the transportation distance is long, people can connect several belt conveyors in series and use them in groups.

Moreover, when conveying upward, the slope should not be greater than 14-16.

Meanwhile, when conveying downward, the slope should not be greater than 6-8.

As for the limit speed of the belt conveyor, it is best not to exceed 1.2m/s. And this avoids the separation of concrete because the speed is too fast.

Moreover, people should avoid unloading concrete directly from the belt conveyor into the warehouse.

And this can prevent the separation of concrete.

Meanwhile, this can avoid the excessive concentration of stockpiles to affect the liquidation.

Therefore, people should use a slab or funnel to make the concrete fall vertically.

Besides, people should install hard rubber scrapers on the waist or end of the belt conveyor. And this can scrape off the mortar stuck on the belt.

So, this reduces the loss of mortar. Moreover, this also avoids concrete separation caused by mortar flowing when the belt is running.

Meanwhile, the relationship between the slope and slump of the belt conveyor is determined according to the specific situation.

So, before using, people should conduct experiments to determine them.

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Conclusion

Concrete delivery is an important part of concrete engineering.

And it refers to the process by which people send concrete from the mixing station to the pouring point.

Meanwhile, during transportation, the cohesion, and internal friction will be significantly weakened due to the turbulence and vibration of the transportation tool.

And this formed a phenomenon of stratification and segregation.

So, the transportation road should be flat.

And people need to select an appopriate means for concrete delivery.

As for the transportation time of concrete, it refers to the time when all the materials are discharged from the machine port and the concrete is discharged into the warehouse.

Moreover, in order to avoid a concrete setting, the sum of the time when people mix the concrete and finish pouring should not exceed the initial setting time of the concrete.

In the process of concrete transportation, the best solution is to ensure that people can directly transport the concrete to every part of the project.

Meanwhile, people should try to avoid second dumping.

And this makes people choose a good transportation plan and transportation.

For concrete transportation vehicles, there are many kinds of it. Moreover, the mode of transportation is also different.

Commonly used transporters include single-wheeled trolleys, two-wheeled rack trucks, dump trucks, automobiles, belt conveyors, tower cranes, gantry cranes, and pumped concrete.

That’s all for concrete delivery today.

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