§4.3.3 evaluation of workability slump test vebe consistometer test
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§4.3.3 Evaluation of §4.3.3 Evaluation of WorkabilityWorkability
Slump testSlump testVebe ConsistometerVebe Consistometer TestTest
• Slump testSlump test
– Index (Slump)Index (Slump)Slump is a common field control test for concrete mo
bility.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 rangeApplication rangeDmax≯"40mm、 Slump≮"10mm
Evaluation of WorkabilityEvaluation of WorkabilityEvaluation of WorkabilityEvaluation of Workability
• Slump testSlump test
– Testing methodTesting method put the concrete composite in a slump cone in put the concrete composite in a slump cone in
standard methods standard methods smooth the top surfacesmooth the top surface remove the cone remove the cone measure the composite subsidence for gravitymeasure the composite subsidence for gravity
Evaluation of WorkabilityEvaluation of WorkabilityEvaluation of WorkabilityEvaluation of Workability
Slump=height before subsidenceSlump=height before subsidence －－ height after subsidenceheight after subsidence
Slump Test VideoSlump Test Video
Fig.4.3.2 Fig.4.3.2 SSlump lump CConeone
• EvaluationEvaluation– Mobility
• large slump→great mobility
– Viscidity• It will have three possibilities after kicking
the side of composite. (good, poor, poor)
Evaluation of WorkabilityEvaluation of WorkabilityEvaluation of WorkabilityEvaluation of Workability
请点击右键选择“播放”观看 Flash 动画
• EvaluationEvaluationWater retention
More paste bleeding means poor capacity of water retention and less paste bleeding means good capacity of water retention.
Evaluation of WorkabilityEvaluation of WorkabilityEvaluation of WorkabilityEvaluation of Workability
• Vebe ConsistometerVebe Consistometer TestTest– 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.
Evaluation of WorkabilityEvaluation of WorkabilityEvaluation of WorkabilityEvaluation of Workability
Vebe ConsistometerVebe Consistometer TestTest
Fig4.3.3 Vebe Consistometer Instrument
Thin CompositeThin Composite
LowLowVebe ConsistometerVebe Consistometer
Great MobilityGreat Mobility
HighHighVebe ConsistometerVebe Consistometer
Thick CompositeThick Composite
Small MobilitySmall Mobility