# What is the difference between slump test and compaction factor test?

## What is the difference between slump test and compaction factor 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.

## What is compaction factor in slump test?

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. It was developed by Road Research Laboratory in United Kingdom and is used to determine the workability of concrete.

**What is the compacting factor?**

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.

### What is the relation between the amount of slump and the compacting factor?

The relation between slump and compaction factor is roughly as follows….Relation Between Slump & Compaction factor.

Workability | Slump in mm | Compaction factor |
---|---|---|

Stiff | 0 to 25 | 0.75 |

Stiff plastic | 25 to 50 | 0.85 |

Plastic | 75 to 100 | 0.90 |

Flowing | 150 to 175 | 0.95 |

### How is the compacting factor 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 same concrete fully compacted. The sample of concrete to be tested is placed in the upper hopper up to the brim.

**What is the relation between workability and compacting factor?**

The relationship between workability and compacting factor is higher the compaction factor higher is the work-ability. Theoretically maximum value of the compaction factor can be 0.96 to 1.0.

## What is the purpose compacting factor test?

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.

## How compaction factor is 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 does 95% compaction mean?**

95 percent compaction means that the soil has been compacted to 95 percent of the possible density of the soil through compactive efforts. Maximum dry density, along with optimum moisture content, is determined in the laboratory and provides the target for field compaction.

### How is compaction factor calculated?

Divide the weight of the dry soil by the volume of sand required to fill the hole to find the soil density in pounds per cubic foot. For example, if the weight of the soil is now 1 lb. and the volume of the sand in the hole is . 5 cubic feet, the density would be 1 lb/.

### What is a range of the compaction factor of concrete?

between (0.8 – 0.92)

For the normal range of concrete the compaction factor lies between (0.8 – 0.92). This test is particularly useful for dryer mixes for which the slump test is not satisfactory.

**What are the types of slump?**

There are three types of slump that may occur in a slumps test, namely, true slump, shear slump and collapse slump.