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While testing the compressive strength of cement concrete, the correct standard conditions (viz. temperature, age, humidity and size of the specimen) to be maintained as per I.S. are
- a)27 ± 3º C, 28 days, 90% and 15 cu. cm
- b)26 ± 2º C, 21 days, 80% and 15 cu. cm
- c)25 ± 1º C, 14 days, 75% and 10 cu. cm
- d)27 ± 3º C, 7 days, 70% and 10 cu. cm
Correct answer is option 'A'. Can you explain this answer?
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While testing the compressive strength of cement concrete, the correct...
Standard Conditions for Testing Compressive Strength of Cement Concrete
Introduction:
When testing the compressive strength of cement concrete, it is essential to maintain certain standard conditions to ensure accurate and reliable results. These conditions include temperature, age, humidity, and size of the specimen. In India, the standard conditions are specified by the Indian Standard (I.S.) codes.
Correct Answer:
The correct standard conditions for testing the compressive strength of cement concrete, as per I.S., are option 'A': 27 ± 3°C temperature, 28 days age, 90% humidity, and 15 cubic centimeters size of the specimen.
Explanation:
Temperature:
- The temperature during testing should be maintained at 27 ± 3°C.
- This temperature range is specified to ensure that the concrete specimen is tested under conditions that are representative of normal ambient temperatures.
- Deviations from this temperature range may affect the hydration process of cement and, consequently, the compressive strength of the concrete.
Age:
- The concrete specimen should be tested at 28 days of age.
- This is the standard age for testing the compressive strength of concrete.
- By testing the specimen at 28 days, it allows sufficient time for the hydration process to occur and for the concrete to reach its maximum strength.
Humidity:
- The humidity during testing should be maintained at 90%.
- This high humidity level ensures that the concrete specimen does not lose moisture during the testing process.
- Moisture loss can adversely affect the strength development of concrete and lead to inaccurate test results.
Size of the Specimen:
- The size of the specimen used for testing should be 15 cubic centimeters.
- The size of the specimen is specified to ensure that it is representative of the concrete being used in the construction project.
- The size also ensures that the specimen can be properly loaded in the testing machine and that the stress distribution is uniform.
Conclusion:
In conclusion, the correct standard conditions for testing the compressive strength of cement concrete, as per I.S., are 27 ± 3°C temperature, 28 days age, 90% humidity, and 15 cubic centimeters size of the specimen. Adhering to these conditions ensures that the test results are accurate and reliable, providing valuable information about the strength characteristics of the concrete.
Introduction:
When testing the compressive strength of cement concrete, it is essential to maintain certain standard conditions to ensure accurate and reliable results. These conditions include temperature, age, humidity, and size of the specimen. In India, the standard conditions are specified by the Indian Standard (I.S.) codes.
Correct Answer:
The correct standard conditions for testing the compressive strength of cement concrete, as per I.S., are option 'A': 27 ± 3°C temperature, 28 days age, 90% humidity, and 15 cubic centimeters size of the specimen.
Explanation:
Temperature:
- The temperature during testing should be maintained at 27 ± 3°C.
- This temperature range is specified to ensure that the concrete specimen is tested under conditions that are representative of normal ambient temperatures.
- Deviations from this temperature range may affect the hydration process of cement and, consequently, the compressive strength of the concrete.
Age:
- The concrete specimen should be tested at 28 days of age.
- This is the standard age for testing the compressive strength of concrete.
- By testing the specimen at 28 days, it allows sufficient time for the hydration process to occur and for the concrete to reach its maximum strength.
Humidity:
- The humidity during testing should be maintained at 90%.
- This high humidity level ensures that the concrete specimen does not lose moisture during the testing process.
- Moisture loss can adversely affect the strength development of concrete and lead to inaccurate test results.
Size of the Specimen:
- The size of the specimen used for testing should be 15 cubic centimeters.
- The size of the specimen is specified to ensure that it is representative of the concrete being used in the construction project.
- The size also ensures that the specimen can be properly loaded in the testing machine and that the stress distribution is uniform.
Conclusion:
In conclusion, the correct standard conditions for testing the compressive strength of cement concrete, as per I.S., are 27 ± 3°C temperature, 28 days age, 90% humidity, and 15 cubic centimeters size of the specimen. Adhering to these conditions ensures that the test results are accurate and reliable, providing valuable information about the strength characteristics of the concrete.
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While testing the compressive strength of cement concrete, the correct standard conditions (viz. temperature, age, humidity and size of the specimen) to be maintained as per I.S. area)27 3 C, 28 days, 90% and 15 cu. cmb)26 2 C, 21 days, 80% and 15 cu. cmc)25 1 C, 14 days, 75% and 10 cu. cmd)27 3 C, 7 days, 70% and 10 cu. cmCorrect answer is option 'A'. Can you explain this answer?
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