Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > Consider the following statements:Shrinkage o...
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Consider the following statements:
Shrinkage of concrete depends upon the:
1. Relative humidity of the atmosphere
2. Passage of time
Which of these statements is / are correct?
- a)1 and 2 both
- b)2 only
- c)1 only
- d)None of above
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Consider the following statements:Shrinkage of concrete depends upon t...
Shrinkage of concrete depends upon the relative humidity and time. Shrinkage of concrete is inversely proportional to relative humidity and directly proportional to time.
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Consider the following statements:Shrinkage of concrete depends upon t...
Shrinkage of Concrete
Introduction:
Shrinkage is a phenomenon in concrete where a reduction in volume occurs due to various factors. It is an inherent property of concrete and can cause cracking and deformation if not properly controlled. The shrinkage of concrete depends on several factors, including the relative humidity of the atmosphere and the passage of time.
Statement 1: Relative humidity of the atmosphere
The relative humidity of the atmosphere plays a significant role in the shrinkage of concrete. When the relative humidity is low, the moisture present in the concrete evaporates more quickly, leading to shrinkage. This is because the rate of evaporation is higher than the rate of moisture absorption from the surrounding environment, causing the concrete to lose moisture and reduce in volume. On the other hand, when the relative humidity is high, the rate of moisture absorption is higher than the rate of evaporation, resulting in a minimal shrinkage of concrete.
Statement 2: Passage of time
The passage of time is another crucial factor that influences the shrinkage of concrete. As time progresses, the moisture within the concrete continues to dissipate, causing a gradual reduction in volume. This process is commonly known as drying shrinkage. The longer the concrete is exposed to the atmosphere, the more time it has to lose moisture and shrink. Therefore, the passage of time has a direct impact on the shrinkage of concrete.
Conclusion:
Both statements 1 and 2 are correct. The shrinkage of concrete is influenced by the relative humidity of the atmosphere as well as the passage of time. The relative humidity determines the rate of moisture evaporation and absorption, while the passage of time allows the concrete to gradually lose moisture and shrink. It is essential to consider these factors during the design and construction of concrete structures to prevent cracking and deformation caused by shrinkage.
Introduction:
Shrinkage is a phenomenon in concrete where a reduction in volume occurs due to various factors. It is an inherent property of concrete and can cause cracking and deformation if not properly controlled. The shrinkage of concrete depends on several factors, including the relative humidity of the atmosphere and the passage of time.
Statement 1: Relative humidity of the atmosphere
The relative humidity of the atmosphere plays a significant role in the shrinkage of concrete. When the relative humidity is low, the moisture present in the concrete evaporates more quickly, leading to shrinkage. This is because the rate of evaporation is higher than the rate of moisture absorption from the surrounding environment, causing the concrete to lose moisture and reduce in volume. On the other hand, when the relative humidity is high, the rate of moisture absorption is higher than the rate of evaporation, resulting in a minimal shrinkage of concrete.
Statement 2: Passage of time
The passage of time is another crucial factor that influences the shrinkage of concrete. As time progresses, the moisture within the concrete continues to dissipate, causing a gradual reduction in volume. This process is commonly known as drying shrinkage. The longer the concrete is exposed to the atmosphere, the more time it has to lose moisture and shrink. Therefore, the passage of time has a direct impact on the shrinkage of concrete.
Conclusion:
Both statements 1 and 2 are correct. The shrinkage of concrete is influenced by the relative humidity of the atmosphere as well as the passage of time. The relative humidity determines the rate of moisture evaporation and absorption, while the passage of time allows the concrete to gradually lose moisture and shrink. It is essential to consider these factors during the design and construction of concrete structures to prevent cracking and deformation caused by shrinkage.
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Consider the following statements:Shrinkage of concrete depends upon t...
Relative humidity of the atmosphere and passage of time
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Consider the following statements:Shrinkage of concrete depends upon the:1. Relative humidity of the atmosphere2. Passage of timeWhich of these statements is / are correct?a)1 and 2 bothb)2 onlyc)1 onlyd)None of aboveCorrect answer is option 'A'. Can you explain this answer?
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