Slump test on concrete is performed to check the concrete workability. A good workable concrete possesses good strength.
What is workability of concrete?
Workability of concrete is defined as how easily concrete can be mixed, transported, consolidated, and placed in position in a homogenious state. Workability of concrete impacts concrete strength, quality, and therefore cost of labour for placing and finishing operations.
Methods of improving workability of concrete:
- To increase the workbility we have to follow a few steps, they are:
- Increase water-cement ratio
- Using large aggregate
- Using well-rounded and smooth aggregate ratherthan irregular shape.
- By proper mixing time and temperature.
- By using non-porous and saturated aggregate.
The following tests are commonly used to check the workability of concrete, they are
1. Slump test
2. Compaction factor test
3. Kelly ball test
4. Flow test
5. K-Slump test
6. Vee-Bee consistometer test.
Reference: American Concrete Institute (ACI) Standard 116R-90 (ACI 1990b)