What is the compacting factor of concrete?

The compacting factor is defined as the ratio of the weight of partially compacted concrete to the weight of fully compacted concrete. It shall normally be stated to the nearest second decimal place.

How is compaction factor related to workability of concrete?

Compaction factor test is the workability test for concrete conducted in laboratory. The compaction factor is the ratio of weights of partially compacted to fully compacted concrete. The compaction factor test is used for concrete which have low workability for which slump test is not suitable.

What is the aim of compacting factor test?

Compacting factor test is adopted to determine the workability of concrete where the nominal size of the aggregate does not exceed 40 mm. It is based on the definition, that workability is that property of concrete, which determines the amount of work required to produce full compaction.

How is the compacting factor of concrete measured?

The degree of compaction, called the compacting factor, is measured by the density ratio, i.e. the ratio of the density actually achieved in the test to the density of the same concrete fully compacted.

What are the workability of concrete?

Workability of Concrete is a broad and subjective term describing how easily freshly mixed concrete can be mixed, placed, consolidated, and finished with minimal loss of homogeneity.

What are the factor affecting workability of concrete?

The Factors that Affect the Workability of Concrete are Given Below:

• Water Content of the Concrete Mix:
• The Size of Aggregates:
• The shape of Aggregates:
• Surface Texture of Aggregates:
• The Porosity of Aggregates:
• Grading of Aggregates:
• Uses of Concrete Admixtures:
• Ambient Temperature:

Which test gives good results for rich mixes?

Slump test gives fairly good results for a plastic mix. This test is not sensitive for a stiff mix or zero slump mix. In case of dry mix, no variation can be detected between mixes of different workability. In case of rich mixes, the value is satisfactory, their slump being sensitive to variations in workability.

What is the principle of VEE BEE test?

The test measures the relative effort required to change a mass of concrete from one definite shape to another (i.e., from conical to cylindrical) by means of vibration. The amount of effort (called remoulding effort) is taken as the time in seconds, required to complete the change.

What is the slump test?

The Slump test is used to evaluate for lumbar nerve root impingement or irritation. It begins with the patient seated on the table with both hips and knees positioned at 90°. The examiner stands to the side of the patient.

What is the maximum height through which concrete can be poured?

What is the maximum height through which concrete can be poured? Explanation: Concrete consists of coarse aggregates. If it is placed or poured from a height above 1 m, segregation of coarse aggregate will take place, leading to improper distribution.

What is an example of workability?

Definition of ‘workability’ The key to producing high-quality decorative concrete is to keep the water-cement ratio as low as possible without sacrificing workability. The workability of a substance, especially a metal, is how easily it can be changed into a new shape.

Why is the compaction factor test used on concrete?

Compaction factor test on concrete is a very sensitive test and can be used even for the concrete with very low workability which cannot be done by the slump test. This test is known as the compaction factor test because the degree of workability is defined as the amount of work required for placing and compacting fully.

How is the workability of concrete is determined?

Workability of concrete is better determined by compaction factor test. Compaction factor test. In this test the amount of compaction obtained by spending a known amount of energy is measured. This gives an idea of workability. The apparatus (Fig. 8.3.) used for the test consists of two hoppers A and B and a cylinder C.

How does water affect the workability of concrete?

Workability of concrete increases with the addition of water but it reduces the strength and as such it is not a very desirable way of increasing the workability. Use of aggregates which are round and have smooth surfaces increases the workability.

Can you use crushed aggregate in compacting test?

At the less workable end of this group, manually compacted flat slabs using crushed aggregates. Normal reinforced concrete manually compacted and heavily reinforced sections with vibration. For sections with congested reinforcement. Not normally suitable for vibration, for pumping and tremle placing. Flow table test is more suitable.