The effect of adding calcium chloride in concrete is(i) to increase sh...
Calcium chloride is a common accelerator, used to accelerate the time of set and the rate of strength gain, thus setting time decreases. Calcium chloride is generally used in cold weather to hasten the setting time and produces an early finish of the concrete. Calcium chloride can effect the characteristics of concrete causing temperature rise, increased internal stresses, corrosion of unprotected reinforcement, a decrease in the resistance to freezing and thawing, an increase in the attack of sulphates, and an increase in the amount of drying shrinkage between 10 and 50 percent.
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The effect of adding calcium chloride in concrete is(i) to increase sh...
Effect of Adding Calcium Chloride in Concrete
Adding calcium chloride in concrete has various effects on its properties. The correct answer to the given question is option 'B' - (i) and (iv) i.e., adding calcium chloride in concrete decreases shrinkage and decreases setting time. Let's discuss these effects in detail:
Decrease in Shrinkage:
- Calcium chloride is a type of accelerating admixture that enhances the hydration process of cement in concrete.
- As a result, the concrete gains strength quickly and reduces the water-cement ratio, which ultimately decreases shrinkage.
- Therefore, the addition of calcium chloride in concrete decreases shrinkage and improves the durability of the structure.
Decrease in Setting Time:
- Another effect of adding calcium chloride in concrete is that it decreases the setting time.
- The calcium ions present in calcium chloride accelerate the rate of hydration of cement, which leads to the formation of more C-S-H gel and reduces the setting time.
- However, excessive use of calcium chloride can lead to the formation of excessive heat, which can damage the concrete.
Conclusion:
In conclusion, adding calcium chloride in concrete has various effects on its properties. It decreases shrinkage, improves the durability of the concrete and decreases the setting time. However, it should be used in a limited quantity to avoid any harm to the concrete.
The effect of adding calcium chloride in concrete is(i) to increase sh...
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