What is the purpose of slump cone test?

Concrete slump test or slump cone test is to determine the workability or consistency of concrete mix prepared at the laboratory or the construction site during the progress of the work. Concrete slump test is carried out from batch to batch to check the uniform quality of concrete during construction.

What is shape of slump cone?

The test is carried out using a metal mould in the shape of a conical frustum known as a slump cone or Abrams cone, that is open at both ends and has attached handles.

What is the ideal shape of a mold in performing slump test?

Mould: Shape of the mould is a frustum of a cone. The cone is known as slump cone or Abrams cone. Slump cone is made of steel, plastic, etc. Its height is 12 inches (30 cm).

Why compaction factor test is done?

Why compaction factor test is done? The compaction factor test is carried out to measure the degree of workability of fresh concrete with regard to the internal energy required for compacting concrete thoroughly. The compacting factor test is used to find out the low workability of concrete.

What is true slump?

True slump refers to general drop of the concrete mass evenly all around without disintegration. It may undergo segregation and bleeding and thus is undesirable for the durability of concrete. Collapse slump indicates that concrete mix is too wet and the mix is regarded as harsh and lean.

What type of slump shape in slump test is not satisfactory?

Collapse Slump: It shows that due to a high water-cement ratio, the shape of a slump is not a clear dimension. It means, concrete is very high workability, for which slump test is not suitable. Shear Slump: This shape of slump is the same as shear failure of soil.

How is slump measured?

Place a straight edge, preferably the tamping rod, across the slump mold base, with one end suspended over the pile of concrete. Using a tape or ruler, measure the distance from the bottom of the straight edge to the displaced center of the slumped concrete. Record your results to the nearest 1/4 of an inch.

Why compaction factor test is better than slump test?

Ans:-The main difference between both is that compaction factor test is more sensitive and precise than slump test and is particularly useful for concrete mixes of low workability and also able to indicate small variations in workability over a wide range. 2. List the different types of Slump.

What is the importance of compaction?

Compaction increases the shear strength of soils by adding friction from the interlocking of particles. Future settlement of soils is reduced by increasing the stiffness and eliminating voids creating a densified soil.