Table of Contents
- 1 What is the compaction factor of fresh concrete?
- 2 How much the compaction factor should be?
- 3 What is a compacting factor test for concrete?
- 4 How is the compacting factor CF in the compacting factor test is measured?
- 5 What is the importance of compaction factor test conducted in concrete?
- 6 Why compacting factor test is more accurate than slump test?
- 7 What is meant by compaction of concrete?
- 8 How do I choose the right compaction method for my project?
What is the compaction factor of fresh concrete?
The compacting factor lies between 0.8 to 0.92 for the normal range of concrete. For concrete which has low workability for which slump test is not suitable then the compaction factor test is used and this test is conducted in the laboratory.
How much the compaction factor should be?
6. Result
| Workability | Compaction Factor | Slump (mm) |
|---|---|---|
| Very Low | 0.78 | 0 – 25 |
| Low | 0.85 | 25 – 50 |
| Medium | 0.92 | 50 – 100 |
| High | 0.95 | 100 – 175 |
What should be the compaction factor for water?
Prepare the mix with 1:1.5:3 by adding a required amount water as per Water cement ratio. Now mix the fresh concrete. See that the Inner surfaces of conical hoppers should be free from moisture and apply grease to it.
What are the factors that affect the value of compaction factor?
Factors affecting Compaction of soil
- Moisture content. To achieve the desired density of the soil, the moisture content of that soil has to be controlled properly.
- Types of soil. The soil type influences the compaction of that soil to a great extent.
- Amount of compaction.
- Contact Pressure.
- Speed of Rolling.
What is a compacting factor test for 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. It was developed by Road Research Laboratory in United Kingdom and is used to determine the workability of concrete.
How is the compacting factor CF in the compacting factor test is measured?
The degree of compaction is also called the compacting factor and is measured with the help of density ratio that is the ratio of density actually achieved in the test to the density of same concrete when it is fully compacted. Its maximum answer is 1 but practically it is lesser than 1.
What are the advantages of compacting factor test?
Advantages of compaction factor test This test is suitable for concrete of low workability. The compaction factor test gives more information about compatibility as compared to the slump test. This test is more precise than static tests for highly thixotropic concrete mixtures and is a dynamic test.
What is the importance of compaction of concrete?
Purpose of Concrete Compaction Compaction significantly increases the ultimate strength of concrete and enhances the bond with reinforcement. It also increases the abrasion resistance and general durability of the concrete, decreases the permeability and helps to minimise its shrinkage and creep characteristics.
What is the importance of compaction factor test conducted in concrete?
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.
Why compacting factor test is more accurate 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.
Which factors affect compacted density?
1. Which of the following factors affects compacted density? Explanation: Water content, type of soil, addition of admixtures, amount and type of compaction are the various factors which affect the compacted density.
What is compacting value?
Calculation of Compaction Factor Value The compaction factor is defined as the ratio of the weight of partially compacted concrete to the weight of fully compacted concrete. It shall normally to be stated to the nearest second decimal place.
What is meant by compaction of concrete?
Compaction of Concrete – Methods and Results of Improper Vibration of Concrete. Compaction of Concrete is an operation in which fresh concrete is compacted in forms and make it encircle reinforcements and other embedded objects such as tubes in the mold.
How do I choose the right compaction method for my project?
Concrete consolidation can be carried out either by hand or machines. There are many factors that should be considered to choose compaction methods such as reinforcement quantities and spacing, concrete paste consistency and formwork complexity.
How to determine the workability of fresh concrete of given proportions?
Experiment :- To determine the workability of Fresh Concrete of given proportions by Slump Test and Compacting Factor Test.
What is the actual proportion of water and cement in concrete?
Ans:- The actual proportion of water and cement in concrete is 1:5. 4.What are the standard used in slump test and compacting factor test. Ans:- The standard used in slump test is ASTM: C143 and B.S: 1882 part 2, and the standard used in compaction factor test is IS: 1199-1959.