1. §4.3.3 Evaluation of Workability
Slump test
Vebe Consistometer Test

2. Evaluation of Workability
Slump test
Index (Slump)
Slump is a common field control test for concrete mobility.
It is the subsidence of fresh concrete upon removal of a 12-inch truncated cone form.
Plasticity and water retention also can be evaluated by slump test.
Application range
Dmax≯40mm、Slump≮10mm

3. Evaluation of Workability
Slump test
Testing method
put the concrete composite in a slump cone in standard methods
smooth the top surface
remove the cone
measure the composite subsidence for gravity
Slump=height before subsidence－height after subsidence

4. Slump Test Video
Fig Slump Cone

5. Evaluation of Workability
Mobility
large slump→great mobility
Viscidity
It will have three possibilities after kicking the side of composite. (good, poor, poor)

6. 请点击右键选择“播放”观看Flash动画

7. Evaluation of Workability
Water retention
More paste bleeding means poor capacity of water retention and less paste bleeding means good capacity of water retention.

8. Evaluation of Workability
Vebe Consistometer Test
Application range
When dry composite with D≯40mm, Vebe Consistometer is 5-30s(slump＜10mm).
Testing Method
Put the composite of truncated cone shape in the container of Vebe Consistometer instrument and make the transparent disc touch to the top of cone, then put on vibrating table and record the time when the disc is covered with paste.

9. Vebe Consistometer Test
Fig Vebe Consistometer Instrument

10. Low
Vebe Consistometer
High
Vebe Consistometer
Thin Composite
Thick Composite
Great Mobility
Small Mobility