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In the context of provisions relating to durability of concrete, consider the following assertion:
Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.
Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).
Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.
Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).
Q. Which one of the following statements is correct?
- a)Assertion (1) is true and Assertion (2) is FALSE
- b)Both Assertion (1) and Assertion (2) are TRUE
- c)Both Assertion (1) and Assertion 2) are FALSE
- d)Assertion (1) is false and Assertion (2) is TRUE
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
In the context of provisions relating to durability of concrete, consi...
As per IS-456, where freezing and thawing actions under wet conditions exit, inhance durability can be obtained by the use of suitable air entraining admixture.
The entrained air percentage can vary from 4 ± 1 to 5 ± 1 (i.e. 3 to 6%) depending on size of aggregate. Hence, Assertion (1) is correct.
Equivalent alkali content (in terms of Na2O equivalent)
= Na2O + 0.658 × K2O
Molecular ratio of Na2O to K2O = 0.658 = 1% + 0.658 × 0.6% = 1.39
≃ 1.4 (rounded to 1 decimal place).
The entrained air percentage can vary from 4 ± 1 to 5 ± 1 (i.e. 3 to 6%) depending on size of aggregate. Hence, Assertion (1) is correct.
Equivalent alkali content (in terms of Na2O equivalent)
= Na2O + 0.658 × K2O
Molecular ratio of Na2O to K2O = 0.658 = 1% + 0.658 × 0.6% = 1.39
≃ 1.4 (rounded to 1 decimal place).
Most Upvoted Answer
In the context of provisions relating to durability of concrete, consi...
Assertion (1) is true and Assertion (2) is true.
Explanation:
Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.
- According to IS 456-2000 (Indian Standard code for Plain and Reinforced Concrete), air entrainment is required for concrete exposed to aggressive environments such as marine environments.
- The purpose of air entrainment is to improve the durability of concrete by reducing the damage caused by freeze-thaw cycles and other environmental factors.
- Air entrainment creates small air bubbles in the concrete, which act as pressure relief points when the water inside the concrete freezes and expands.
- The recommended air entrainment range for concrete exposed to marine environments is 3% to 6%, as specified in IS 456-2000.
Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).
- The equivalent alkali content of a cement is calculated by converting the sodium oxide (Na2O) and potassium oxide (K2O) content to an equivalent sodium oxide content.
- The equivalent alkali content is important because excessive amounts of alkalis in concrete can lead to alkali-aggregate reaction (AAR), which can cause significant damage to the concrete over time.
- To calculate the equivalent alkali content, the Na2O content is multiplied by 0.658 and the K2O content is multiplied by 0.829.
- For the given cement with 1% Na2O and 0.6% K2O, the equivalent alkali content can be calculated as follows:
Equivalent alkali content = (1% * 0.658) + (0.6% * 0.829)
= 0.658% + 0.4974%
≈ 1.1554%
Rounded to 1 decimal place, the equivalent alkali content is approximately 1.2%.
Conclusion:
Both Assertion (1) and Assertion (2) are true.
Explanation:
Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.
- According to IS 456-2000 (Indian Standard code for Plain and Reinforced Concrete), air entrainment is required for concrete exposed to aggressive environments such as marine environments.
- The purpose of air entrainment is to improve the durability of concrete by reducing the damage caused by freeze-thaw cycles and other environmental factors.
- Air entrainment creates small air bubbles in the concrete, which act as pressure relief points when the water inside the concrete freezes and expands.
- The recommended air entrainment range for concrete exposed to marine environments is 3% to 6%, as specified in IS 456-2000.
Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).
- The equivalent alkali content of a cement is calculated by converting the sodium oxide (Na2O) and potassium oxide (K2O) content to an equivalent sodium oxide content.
- The equivalent alkali content is important because excessive amounts of alkalis in concrete can lead to alkali-aggregate reaction (AAR), which can cause significant damage to the concrete over time.
- To calculate the equivalent alkali content, the Na2O content is multiplied by 0.658 and the K2O content is multiplied by 0.829.
- For the given cement with 1% Na2O and 0.6% K2O, the equivalent alkali content can be calculated as follows:
Equivalent alkali content = (1% * 0.658) + (0.6% * 0.829)
= 0.658% + 0.4974%
≈ 1.1554%
Rounded to 1 decimal place, the equivalent alkali content is approximately 1.2%.
Conclusion:
Both Assertion (1) and Assertion (2) are true.
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In the context of provisions relating to durability of concrete, consider the following assertion:Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).Q. Which one of the following statements is correct?a)Assertion (1) is true and Assertion (2) is FALSEb)Both Assertion (1) and Assertion (2) are TRUEc)Both Assertion (1) and Assertion 2) are FALSEd)Assertion (1) is false and Assertion (2) is TRUECorrect answer is option 'B'. Can you explain this answer?
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In the context of provisions relating to durability of concrete, consider the following assertion:Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).Q. Which one of the following statements is correct?a)Assertion (1) is true and Assertion (2) is FALSEb)Both Assertion (1) and Assertion (2) are TRUEc)Both Assertion (1) and Assertion 2) are FALSEd)Assertion (1) is false and Assertion (2) is TRUECorrect answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about In the context of provisions relating to durability of concrete, consider the following assertion:Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).Q. Which one of the following statements is correct?a)Assertion (1) is true and Assertion (2) is FALSEb)Both Assertion (1) and Assertion (2) are TRUEc)Both Assertion (1) and Assertion 2) are FALSEd)Assertion (1) is false and Assertion (2) is TRUECorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In the context of provisions relating to durability of concrete, consider the following assertion:Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).Q. Which one of the following statements is correct?a)Assertion (1) is true and Assertion (2) is FALSEb)Both Assertion (1) and Assertion (2) are TRUEc)Both Assertion (1) and Assertion 2) are FALSEd)Assertion (1) is false and Assertion (2) is TRUECorrect answer is option 'B'. Can you explain this answer?.
In the context of provisions relating to durability of concrete, consider the following assertion:Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).Q. Which one of the following statements is correct?a)Assertion (1) is true and Assertion (2) is FALSEb)Both Assertion (1) and Assertion (2) are TRUEc)Both Assertion (1) and Assertion 2) are FALSEd)Assertion (1) is false and Assertion (2) is TRUECorrect answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about In the context of provisions relating to durability of concrete, consider the following assertion:Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).Q. Which one of the following statements is correct?a)Assertion (1) is true and Assertion (2) is FALSEb)Both Assertion (1) and Assertion (2) are TRUEc)Both Assertion (1) and Assertion 2) are FALSEd)Assertion (1) is false and Assertion (2) is TRUECorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In the context of provisions relating to durability of concrete, consider the following assertion:Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).Q. Which one of the following statements is correct?a)Assertion (1) is true and Assertion (2) is FALSEb)Both Assertion (1) and Assertion (2) are TRUEc)Both Assertion (1) and Assertion 2) are FALSEd)Assertion (1) is false and Assertion (2) is TRUECorrect answer is option 'B'. Can you explain this answer?.
Solutions for In the context of provisions relating to durability of concrete, consider the following assertion:Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place).Q. Which one of the following statements is correct?a)Assertion (1) is true and Assertion (2) is FALSEb)Both Assertion (1) and Assertion (2) are TRUEc)Both Assertion (1) and Assertion 2) are FALSEd)Assertion (1) is false and Assertion (2) is TRUECorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Civil Engineering (CE).
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