Welcome users. Here you get important civil engineering software toturials to help on your design & related tasks(structural,road,quantity serveying & project management ).
@engineer03

Welcome users. Here you get important civil engineering software toturials(Amharic) to help on your design & related tasks(structural,road,quantity serveying & project management ).

@engineer03

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👉SLUMP TEST OF CONCRETE @engineersWorks
~~~~~~~~~~~~~~~~
▶The concrete slump test is an empirical test that
measures the workability of fresh concrete. The test
is performed to check the consistency of freshly
mixed concrete in a specific batch. *Consistency refers to the ease and homogeneity with which the concrete can be mixed, placed, compacted and finished. *This test is most widely used due to the simplicity of apparatus and simple test procedure.
*The slump test gives satisfactory results for the
concrete mix of medium to high workability and
unfortunately, it does not give the correct indication
of low workability, which may give zero slumps.
This test is also known as slump cone test.
▶APPARATUS FOR CONCRETE SLUMP TEST:
1. Mould or slump cone with a height of 300 mm,
bottom diameter 200 mm, and top diameter 100
mm.
2. Standard tamping rod.
3. Non-porous base plate.
4. Measuring scale.
▶PROCEDURE OF TEST:
1. First, clean the inner surface of the empty mould and then apply oil to it.
2. Set the mould on a horizontal non-porous and
non-absorbent base plate.
3. Fill the mould fully by pouring freshly mixed
concrete in three equal layers.
4. Stroke each layer 25 times with the standard
tamping rod over the cross section.
5. After stroking 25 times the top layer is struck off
level, now lift the mould slowly in the vertical
direction without disturbing the concrete cone.
6. Use the measuring scale to measure the difference level between the height of the mould and the concrete sample.
*The subsidence of concrete is known as the slump and the value of slump is measured in mm.
▶TYPES OF SLUMP:
*True Slump: The concrete mass after the test when
slumps evenly all around without disintegration is
called the true slump.
*Shear Slump: When one-half of the concrete mass
slide down the other is called the shear slump. This type of slump is obtained in a lean concrete mix.
*Collapse Slump: When the sample is collapsed due to adding excessive water, it is known as collapse slump.
*Zero Slump: For very stiff or dry mixes it does not
show any changes of the slump after removing the
slump cone.
▶ADVANTAGES OF CONCRETE SLUMP TEST:
1. The procedure of slump test is simple and easy
than any other workability test.
2. Inexpensive and portable apparatus are required
for this test.
3. Slump test can be performed at the construction site as well as in the laboratory.
▶LIMITATIONS OF CONCRETE SLUMP TEST:
1. The slump test is limited to concretes with the
maximum size of aggregate less than 38 mm.
2. The test is suitable only for concretes of medium
or high workabilities (i.e having slump values of 25
mm to 125 mm).
3. For very stiff mixes having zero slumps, the
slump test does not show any difference in concretes of different workabilities.
*Recommended Values Of Slumps For Different
Concrete Mixes:
▶Types Of Concrete Slump Range In mm
1. Heavy mass construction 25-50
2. Pavements 20-30
3. Bridge deck 25-75
4. Beams and slabs 50-100
5. Columns, retaining
walls and thin vertical members etc. 75-150
6. Vibrated concrete 12-25
.
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