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Adding an accelerator to concrete increases all of the following except
- a)resistance to alkali-aggregate reaction
- b)rate of hydration of cement
- c)shrinkage
- d)rate of evolution of heat
Correct answer is option 'A'. Can you explain this answer?
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Adding an accelerator to concrete increases all of the following excep...
Accelerators and Concrete Properties
Accelerators are used in concrete to speed up the rate of strength development and reduce the setting time. However, some properties of the concrete are affected by the addition of accelerators.
Effect on Resistance to Alkali-Aggregate Reaction
The resistance of concrete to alkali-aggregate reaction is not affected by the addition of accelerators. This is because accelerators do not contain alkalis, which are responsible for the reaction.
Effect on Rate of Hydration of Cement
The rate of hydration of cement is increased by the addition of accelerators. This is because accelerators contain compounds that react with the cement and promote the formation of hydration products.
Effect on Shrinkage
The addition of accelerators can increase the shrinkage of concrete. This is because the increased rate of hydration leads to the formation of more pores in the concrete, which can result in greater shrinkage.
Effect on Rate of Evolution of Heat
The rate of evolution of heat is increased by the addition of accelerators. This is because the increased rate of hydration leads to a greater amount of heat being released during the reaction.
Conclusion
In summary, the addition of accelerators to concrete can affect various properties of the concrete. While the rate of hydration and evolution of heat are increased, the resistance to alkali-aggregate reaction is not affected. However, the use of accelerators should be carefully considered to ensure that the desired properties of the concrete are achieved.
Accelerators are used in concrete to speed up the rate of strength development and reduce the setting time. However, some properties of the concrete are affected by the addition of accelerators.
Effect on Resistance to Alkali-Aggregate Reaction
The resistance of concrete to alkali-aggregate reaction is not affected by the addition of accelerators. This is because accelerators do not contain alkalis, which are responsible for the reaction.
Effect on Rate of Hydration of Cement
The rate of hydration of cement is increased by the addition of accelerators. This is because accelerators contain compounds that react with the cement and promote the formation of hydration products.
Effect on Shrinkage
The addition of accelerators can increase the shrinkage of concrete. This is because the increased rate of hydration leads to the formation of more pores in the concrete, which can result in greater shrinkage.
Effect on Rate of Evolution of Heat
The rate of evolution of heat is increased by the addition of accelerators. This is because the increased rate of hydration leads to a greater amount of heat being released during the reaction.
Conclusion
In summary, the addition of accelerators to concrete can affect various properties of the concrete. While the rate of hydration and evolution of heat are increased, the resistance to alkali-aggregate reaction is not affected. However, the use of accelerators should be carefully considered to ensure that the desired properties of the concrete are achieved.
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Adding an accelerator to concrete increases all of the following excepta)resistance to alkali-aggregate reactionb)rate of hydration of cementc)shrinkaged)rate of evolution of heatCorrect answer is option 'A'. Can you explain this answer?
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