Are you ever asked what slump you need and words fail you? Slump is how fluid the state of concrete is, how easy it is to place and the name of the procedure used to test this. The higher the slump, the wetter the concrete.
It’s not water alone that can increase workability. This is good news as increasing with water alone can cause concrete to become weaker. High strength mixes we use superplasticisers to increase the slump without affecting the strength. Unlike other companies, using superplasticisers in BUILDR is free of charge.
Our trained technicians measure slump using a cone, shown in the picture above. You pour into the cone, tamp with a metal bar, and then remove the cone. The wetter the concrete is, the more likely it is to drop. Technicians measure this drop in millimeters. Please see the chart below for more details.
|Slump Class||Slump tested by technician, in accordance with EN 12350-2 (mm)|
|S1||10 to 40|
|S2||50 to 90|
|S3||100 to 150|
|S4||160 to 210|
Why do you need to know this as a customer? When ordering through the app, you will have to choose between S1 to S4 for your mix.
S3 is our middle of the range concrete that fits most uses. But different projects often have specific uses and needs. Please see below for an overarching view of slumps for projects. This may differ depending on other factors, so please double check before picking.
- Pipework bedding
- Jobs using a wheel barrow (less likely to spill)
- Minimum slump required when using a pump
- Hard-standing slabs
- External and internal slabs
- Pumped concrete
- Concrete with places hard to reach for compaction
It’s good to have an idea of what you need for your job. If ever in doubt, our orders team are just the other end of the phone. We can help with technical advice regarding your mix. Making it easy for you to get the concrete you need.