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Which of the following effects of Fly Ash on cement concrete is INCORRECT?
- a)Reduces the permeability of concrete
- b)Reduces the amount of air entraining agents
- c)Slightly improves the resistance to sulphate attack
- d)Increases the heat of hydration of concrete
Correct answer is option 'D'. Can you explain this answer?
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Which of the following effects of Fly Ash on cement concrete is INCORR...
The following are the effects of Fly Ash on the properties of cement concrete:
- Reduction in water Demand: The replacement of cement by fly ash reduces the water demand for a given slump. When fly ash is 20 percent of the total cementitious material then water demand is reduced by approximately 10 percent.
- Reduced permeability. The decrease in water content and filling of voids in cement with fly ash material reduces the pore interconnectivity of concrete, thus decreasing permeability.
- Improves resistance of concrete against the sulfate attack: Fly ash induces three phenomena that improve sulfate resistance. These are:
- Fly ash consumes the free lime making it unavailable to react with sulfate
- The reduced permeability prevents sulfate penetration into the concrete
- Replacement of cement reduces the number of reactive aluminates available
- Reduction in Heat of Hydration: Reduces heat of hydration in concrete such that substitution of 30% fly ash results in the reduction of 50-60% of the heat of hydration. This reduction in the heat of hydration does not sacrifice long-term strength gain or durability.
- Improve Alkali aggregate reaction: Fly ash reacts with available alkali in the concrete, which makes them less available to react with certain silica minerals contained in the aggregates and hence, improve the resistance against alkali-aggregate reaction.
- Increase the ultimate strength: The fly ash reacts with available lime and alkali in concrete, producing additional cementitious compounds and thereby increasing the ultimate strength.
- Resistance against corrosion: The reduced permeability prevents chloride penetration from outside into the concrete and hence, reduces the chance of corrosion.
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Which of the following effects of Fly Ash on cement concrete is INCORR...
Incorrect Effect of Fly Ash on Cement Concrete:
Increases the heat of hydration of concrete
One of the incorrect effects of Fly Ash on cement concrete is that it increases the heat of hydration of concrete. This statement is inaccurate because Fly Ash actually has the opposite effect on the heat of hydration.
Correct Effects of Fly Ash on Cement Concrete:
- Reduces the permeability of concrete: Fly Ash fills in the gaps in the concrete matrix, reducing the permeability and making the concrete more durable.
- Reduces the amount of air entraining agents: Fly Ash can act as a supplementary cementitious material, reducing the need for air entraining agents in concrete mixes.
- Slightly improves the resistance to sulphate attack: Fly Ash can improve the resistance of concrete to sulphate attack, increasing the durability of the structure.
In conclusion, while Fly Ash has many beneficial effects on cement concrete, it does not increase the heat of hydration.
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Which of the following effects of Fly Ash on cement concrete is INCORRECT?a)Reduces the permeability of concreteb)Reduces the amount of air entraining agentsc)Slightly improves the resistance to sulphate attackd)Increases the heat of hydration of concreteCorrect answer is option 'D'. Can you explain this answer?
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Which of the following effects of Fly Ash on cement concrete is INCORRECT?a)Reduces the permeability of concreteb)Reduces the amount of air entraining agentsc)Slightly improves the resistance to sulphate attackd)Increases the heat of hydration of concreteCorrect answer is option 'D'. 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 Which of the following effects of Fly Ash on cement concrete is INCORRECT?a)Reduces the permeability of concreteb)Reduces the amount of air entraining agentsc)Slightly improves the resistance to sulphate attackd)Increases the heat of hydration of concreteCorrect answer is option 'D'. 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 Which of the following effects of Fly Ash on cement concrete is INCORRECT?a)Reduces the permeability of concreteb)Reduces the amount of air entraining agentsc)Slightly improves the resistance to sulphate attackd)Increases the heat of hydration of concreteCorrect answer is option 'D'. Can you explain this answer?.
Which of the following effects of Fly Ash on cement concrete is INCORRECT?a)Reduces the permeability of concreteb)Reduces the amount of air entraining agentsc)Slightly improves the resistance to sulphate attackd)Increases the heat of hydration of concreteCorrect answer is option 'D'. 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 Which of the following effects of Fly Ash on cement concrete is INCORRECT?a)Reduces the permeability of concreteb)Reduces the amount of air entraining agentsc)Slightly improves the resistance to sulphate attackd)Increases the heat of hydration of concreteCorrect answer is option 'D'. 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 Which of the following effects of Fly Ash on cement concrete is INCORRECT?a)Reduces the permeability of concreteb)Reduces the amount of air entraining agentsc)Slightly improves the resistance to sulphate attackd)Increases the heat of hydration of concreteCorrect answer is option 'D'. Can you explain this answer?.
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Which of the following effects of Fly Ash on cement concrete is INCORRECT?a)Reduces the permeability of concreteb)Reduces the amount of air entraining agentsc)Slightly improves the resistance to sulphate attackd)Increases the heat of hydration of concreteCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Which of the following effects of Fly Ash on cement concrete is INCORRECT?a)Reduces the permeability of concreteb)Reduces the amount of air entraining agentsc)Slightly improves the resistance to sulphate attackd)Increases the heat of hydration of concreteCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Which of the following effects of Fly Ash on cement concrete is INCORRECT?a)Reduces the permeability of concreteb)Reduces the amount of air entraining agentsc)Slightly improves the resistance to sulphate attackd)Increases the heat of hydration of concreteCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
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