What does the compacting factor test of cement concrete determine?
Slumps for various types of concrete is measured in mm. 2) Compacting factor test: It is suitable for concrete mixes of medium and low workability. It is suitable for determining workability in the laboratory.
What do you mean by compaction factor in compacting factor test?
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 compaction factor for concrete?
Concrete
| Degree of workability | Compacting factor | |
|---|---|---|
| Very low | 0.78 | 0.8 |
| Low | 0.85 | 0.87 |
| Medium | 0.92 | 0.935 |
| High | 0.95 | 0.96 |
Why compaction factor test is important?
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 concrete a mixture of?
In its simplest form, concrete is a mixture of paste and aggregates, or rocks. The paste, composed of portland cement and water, coats the surface of the fine (small) and coarse (larger) aggregates.
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.
What is the correlation between the compacting factor and slump?
Relation with a correlation coefficient of 0.9493 between slump and compacting factor is as shown in Figure 14. This relation can be used if one of these equipment is not available.
What is slump test and compaction factor test?
Slump test and compacting factor tests are the most widely used workability tests for concrete. The degree of workability of concrete depends on the values of test results obtained from slump test and compacting factor tests.
What is the range of values of compacting factor?
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 is the strongest concrete mix ratio?
In making concrete strong, ingredients should usually be mixed in a ratio of 1:2:3:0.5 to achieve maximum strength. That is 1 part cement, 2 parts sand, 3 parts gravel, and 0.5 part water.
What is the ratio for mixing concrete?
In terms of the ratio for concrete, it depends on what strength you are trying to achieve, but as a general guide a standard concrete mix would be 1 part cement to 2 parts sand to 4 parts aggregates. For foundations, a mix of 1 part cement to 3 parts sand to 6 parts aggregates can be used.
What are the limitations of compaction factor test?
Disadvantages of Compaction Factor Test:
- Reduces its usefulness in the field due to the large and bulky nature of the device.
- To measure the mass of the concrete in the cylinder, the test method requires a balance.
- This test method does not use vibration and although the test is commercially available and used rarely.
What is compaction factor test on concrete?
The test was developed for the first time in the United Kingdom by the Road Research Laboratory. The 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.
What is the difference between slump test and compaction factor test?
Compaction factor test is more precise and sensitive than the slump test and it is particularly useful for concrete mixes of very low workability as are normally used when concrete is to be compacted by vibration. Such concrete may be consistently fail to slump.
What is the slump test for concrete?
Slump test doesn’t give accurate results for the low workability of concrete when the slump is <50mm. Here to dealt with Compaction factor test used for concrete mixes of very low workability. The compaction factor is defined as the ratio of the weight of partially compacted concrete to the weight of fully compacted concrete.
What is compcompaction factor test?
Compaction factor test can be defined as the test conducted on concrete to determine the workability of concrete in the laboratory where the maximum size of the aggregate does not exceed 38mm. This test can also be efficiently used in the field. The test was developed for the first time in the United Kingdom by the Road Research Laboratory.
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