Volumetric concrete provides the precise mix type you need for your project. Concrete mixes generally use cement powder which is combined with water and a a mix of coarse and fine aggregates. With the Volumetrics ability to start and stop we can provide concrete for your project with no waste which means you are not paying for concrete you don't need. Tell the operator when you are one wheelbarrow away from having enough concrete and there will be no waste. The material carried onboard isn't combined until it drops into the mixing auger, the remaining unused material on the lorry can be used at the next job or offloaded at the end of the day.
Traditional when you order Ready Mix Concrete or Mini Mix Concrete the lorry is filled with an amount of material to make the volume you have ordered. The mixing process starts immediately and your concrete could be an hour old by the time it gets to you depending on the distance from the batching plant and traffic conditions. With Volumetric Concrete your concrete is mixed on the spot, you can't get fresher, extending the time you have to work with it.
Some concrete mix types include additional materials to meet specialist requirements. Control fibres can reduce the risk of cracking, structural fibres add strength and remove the need for mesh while plasticisers improve flow and workability. Additives can speed up or slow down setting and reduce corrosion where steel rebars are used.
See our concrete strength guide for more information.
Understanding Concrete Slump and Its Importance in Construction
Until recently, the fluidity of concrete has always been referred to as the concretes Slump, its now referred to as the concretes Consistence. We will refer to the fluidity of concrete as slump.
When it comes to concrete, selecting the right type for your project is crucial for achieving optimal results. One essential factor to consider is the concrete's "slump," which refers to its consistency before it sets. So, what is concrete slump and why does it matter.
Concrete slump is a measurement of the flowability of fresh concrete. The higher the slump, the more fluid the concrete is. This term may sound complex, but it's simply measured by testing how much a pile of concrete slumps down when left to stand. To do this, a slump cone is filled with a sample of the concrete, following a specific procedure, the cone is removed, and the distance from the top of the cone to the top of the concrete slump is measured.
In general, S1 concrete is ideal for kerb and pipework bedding, S2 for strip footings and hard-standing slabs, and S3 for trench-filled foundations that require high flowability. S4 and S5 concretes are typically used for specialist applications such as form work, slabs, pumping and piling concrete and require the addition of addmixtures.
Please refer to the slump class chart below for further information.
Concrete slump is classified according to its average slump value, ranging from S1 to S5. The table below shows the different classes, their slump ranges, and target slumps. The S1 class is a relatively dry mix, while S5 has the highest fluidity.
It is important to remember that just adding additional water to the concrete will alter the Water/Cement (W/C) ratio and too much water not only means you may not achieve the required strength but will also increase the risk of shrinkage and cracking. Its always advisable to either increase the cement content or use a water reducing admixture to maintain the W/C ratio without impacting the strength.
Performing a slump test is essential to determine the workability and flowability of different concretes. It helps to ensure that the concrete is mixed correctly, avoiding improper batch mixes. By conducting a slump test, you can choose the right concrete for the job, ensuring that your project meets the desired specifications and quality standards.
Understanding concrete slump is vital for selecting the right type of concrete for your project. By determining the appropriate slump class and performing a slump test, you can ensure that your concrete is correctly mixed, flows efficiently, and meets your project's desired specifications.
CLASS |
SLUMP RANGE |
TARGET SLUMP |
WORKABILITY |
|
---|---|---|---|---|
S1 |
10-40 |
20 |
LOW |
SEMI DRY |
S2 |
50-90 |
70 |
MEDIUM |
MOIST |
S3 |
100-150 |
130 |
MEDIUM/HIGH |
WET |
S4 |
160-210 |
180 |
|
|
S5 |
210 + |
220 |
|
|
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