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For cylindrical concrete specimens, the number of strokes when compacting by hand is not less than ___________ to perform the compression test of concrete in the laboratory.
- a)20 per layer
- b)25 per layer
- c)10 per layer
- d)35 per layer
Correct answer is option 'D'. Can you explain this answer?
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For cylindrical concrete specimens, the number of strokes when compact...
Answer:
When performing the compression test of concrete in the laboratory, it is necessary to compact the cylindrical concrete specimens properly. Compaction ensures that the concrete is evenly distributed and free of voids, which is essential for obtaining accurate and reliable test results. The number of strokes required for compaction depends on various factors such as the size of the specimen, the consistency of the concrete, and the compaction method used.
The correct answer to the given question is option D, which states that the number of strokes when compacting by hand for cylindrical concrete specimens should not be less than 35 per layer. This means that for each layer of concrete placed in the specimen mold, it should be compacted with at least 35 strokes.
Reasoning:
- Importance of compaction: Compaction is crucial as it removes air voids and ensures proper consolidation of the concrete. Lack of compaction can lead to a decrease in strength and an increase in porosity, resulting in inaccurate test results.
- Factors affecting the number of strokes: The number of strokes required for compaction depends on various factors such as the size of the specimen, the workability of the concrete, and the compaction method used.
- Size of the specimen: Cylindrical concrete specimens used in compression tests can have different sizes, such as 150 mm x 300 mm or 100 mm x 200 mm. Larger specimens may require more strokes for proper compaction compared to smaller specimens.
- Workability of the concrete: The workability of the concrete, which is influenced by factors such as water-cement ratio and aggregate grading, affects the ease of compaction. Lower workability concrete may require more strokes to ensure proper consolidation.
- Compaction method: There are different methods of compaction, including hand compaction, vibration, and mechanical compaction. Each method has its own requirements in terms of the number of strokes or duration of compaction.
- Specification requirements: The given question asks for the minimum number of strokes when compacting by hand. The specified minimum number of strokes is 35 per layer.
- Ensuring proper compaction: The specified minimum number of strokes is based on standard practices and experience to ensure that the concrete specimens are adequately compacted. It is important to follow these guidelines to obtain reliable test results.
In conclusion, when performing the compression test of concrete in the laboratory, the number of strokes required for compacting cylindrical concrete specimens by hand should not be less than 35 per layer. Proper compaction is essential for obtaining accurate test results and ensuring the quality of the concrete.
When performing the compression test of concrete in the laboratory, it is necessary to compact the cylindrical concrete specimens properly. Compaction ensures that the concrete is evenly distributed and free of voids, which is essential for obtaining accurate and reliable test results. The number of strokes required for compaction depends on various factors such as the size of the specimen, the consistency of the concrete, and the compaction method used.
The correct answer to the given question is option D, which states that the number of strokes when compacting by hand for cylindrical concrete specimens should not be less than 35 per layer. This means that for each layer of concrete placed in the specimen mold, it should be compacted with at least 35 strokes.
Reasoning:
- Importance of compaction: Compaction is crucial as it removes air voids and ensures proper consolidation of the concrete. Lack of compaction can lead to a decrease in strength and an increase in porosity, resulting in inaccurate test results.
- Factors affecting the number of strokes: The number of strokes required for compaction depends on various factors such as the size of the specimen, the workability of the concrete, and the compaction method used.
- Size of the specimen: Cylindrical concrete specimens used in compression tests can have different sizes, such as 150 mm x 300 mm or 100 mm x 200 mm. Larger specimens may require more strokes for proper compaction compared to smaller specimens.
- Workability of the concrete: The workability of the concrete, which is influenced by factors such as water-cement ratio and aggregate grading, affects the ease of compaction. Lower workability concrete may require more strokes to ensure proper consolidation.
- Compaction method: There are different methods of compaction, including hand compaction, vibration, and mechanical compaction. Each method has its own requirements in terms of the number of strokes or duration of compaction.
- Specification requirements: The given question asks for the minimum number of strokes when compacting by hand. The specified minimum number of strokes is 35 per layer.
- Ensuring proper compaction: The specified minimum number of strokes is based on standard practices and experience to ensure that the concrete specimens are adequately compacted. It is important to follow these guidelines to obtain reliable test results.
In conclusion, when performing the compression test of concrete in the laboratory, the number of strokes required for compacting cylindrical concrete specimens by hand should not be less than 35 per layer. Proper compaction is essential for obtaining accurate test results and ensuring the quality of the concrete.
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Community Answer
For cylindrical concrete specimens, the number of strokes when compact...
Compressive Strength Test of concrete:
According to IS: 516 (1959),
(Case 1)
According to IS: 516 (1959),
(Case 1)
- The concrete of 150×150 mm size is compacted with 35 strokes per layer
(Case2)
- Concrete of 100×100 mm size is compacted with 25 strokes per layer.
For testing the compressive strength we generally use, 150 mm size cube. So, we have to go for 35 in this particular question.
Additional Information
- Test specimens should be stored at a temperature of 27 ± 3 ℃ at 90% humidity for 24 ± 1/2 hours from the time of addition of water. After this time, specimens are removed from mould and placed in water and taken out just before the test.
- After 28 days or 7 days of curing, the specimen is placed in a compression testing machine which applies a gradual load of 14 MPa per minute.
- The average of three values is taken as the compressive strength of concrete, provided that individual variation is not more than ± 15% of the average.
- 7 days compressive strength = 2/3 of 28 days compressive strength.
- Cube strength = 1.25 cylindrical strength.
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For cylindrical concrete specimens, the number of strokes when compacting by hand is not less than ___________ to perform the compression test of concrete in the laboratory.a)20 per layerb)25 per layerc)10 per layerd)35 per layerCorrect answer is option 'D'. Can you explain this answer?
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