§4.3.3 Evaluation of Workability Slump test Vebe Consistometer Test

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

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

Slump Test Video Fig.4.3.2 Slump Cone

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

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

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.

Vebe Consistometer Test Fig4.3.3 Vebe Consistometer Instrument

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