Explanation:

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Slump test

• It is the most common method used to find the workability of the concrete in the field and laboratory.
• Suitable for concrete having medium to high workability and not suitable for very low or very high workability.

The test apparatus consists of metallic mould in the shape of frustum having bottom diameter of 20 cm, top diameter of 10 cm and height of 30 cm and a tamping rod of height 60 cm and diameter 16 mm.

Placing condition Degree of workability Slump (mm) Blindingconcrete; Shallow sections; Pavements using pavers Very low - Mass concrete; Lightly reinforced sections in slabs, beams, walls, columns; Floors; Hand placed pavements; Canallining; Strip footings low 25-75

Heavily reinforced sections in slabs, beams, walls, columns;

Slipform work; Pumped concrete

Medium

50-100

75-100

Trench fill; In-situ piling High 100-150             Tremie concrete Very high -

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Slump of Pump Mix Concrete!

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Slump of Pump Mix Concrete!

Slump of Pump Mix Concrete!

engr567

(Structural)

(OP)

18 May 10 09:23

Where can I find the allowable slump for pump mix concrete using high range water reducer? We have specified a slump of 4"+/-1" at normal condition - psi and psi concrete (cast in place parking garage). Concrete mix design indicates 8" of slump. I would appreciate help.

RE: Slump of Pump Mix Concrete!

gosai

(Civil/Environmental)

18 May 10 13:06

The slump of the concrete is contractor's item which depends on the site requirements and method of placement. When contractor need higher slump then specified they request the supplier to use superplastisizer to increase slump. Supplier maintain the slump prior to addition of superplasisizer.

RE: Slump of Pump Mix Concrete!

TXStructural

(Structural)

18 May 10 13:34

Using a high range water reducer (and ideally, a viscosity modifier to keep aggregate in suspension), you may end up with anywhere from 8" to something which is too fluid to be measured by slump testing. Since slump is simply a QA measure for water-cement ratio and workability, once the WRA is added, you can't really test for these.

Your admix supplier and ready mix supplier/designer should be able to provide advice.  On small jobs, you may be able to add the admixtures after checking an initial slump (depending on admix).  On large jobs, the supplier should provide test data on the mix design as part of submittals.

RE: Slump of Pump Mix Concrete!

engr567

(Structural)

(OP)

18 May 10 14:30

Thanks both of you.

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