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When percentage of mica present in sand is large it:
- a)Reduces strength of mortar
- b)Increases strength of mortar
- c)No effect on strength
- d)Increases strength to smaller extent
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
When percentage of mica present in sand is large it:a)Reduces strength...
- The presence of any considerable proportion of mica will destroy the value of any sand for concreting purposes.
- Its effect is more injurious upon fine sands than upon coarse.
- It greatly increases the amount of voids, and the smooth surfaces of the mica particles do not permit of a good bond with the surrounding cement.
- A sand containing as high as 20 per cent of mica, will have 67 per cent of voids, will require three times the amount of water for mixing that sand without mica would require, and will show a decrease of 20 per cent in weight, and a loss of two-thirds in the strength of the mixture.
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When percentage of mica present in sand is large it:a)Reduces strength...
Effect of Mica on Strength of Mortar
Mica is a mineral that is commonly found in sand. When the percentage of mica present in sand is large, it can have a negative effect on the strength of mortar. This is because mica particles are flat and thin, which can cause them to create weak planes in the mortar.
Reduces Strength of Mortar
When mica is present in sand, it can reduce the strength of the mortar. This is because mica particles are not as strong as other minerals found in sand, such as quartz. When the mortar dries, the mica particles can create weak planes that can cause the mortar to crack or break under stress.
Increases Water Demand
In addition to reducing the strength of the mortar, mica can also increase the water demand of the mixture. This is because mica particles are hydrophilic, meaning that they attract water. As a result, more water may be needed to achieve the desired consistency of the mortar.
Conclusion
In conclusion, the presence of a large percentage of mica in sand can have a negative effect on the strength of mortar. It can create weak planes in the mortar that can cause it to crack or break under stress. Additionally, it can increase the water demand of the mixture. Therefore, it is important to carefully analyze the sand used in mortar and ensure that the percentage of mica is not too high.
Mica is a mineral that is commonly found in sand. When the percentage of mica present in sand is large, it can have a negative effect on the strength of mortar. This is because mica particles are flat and thin, which can cause them to create weak planes in the mortar.
Reduces Strength of Mortar
When mica is present in sand, it can reduce the strength of the mortar. This is because mica particles are not as strong as other minerals found in sand, such as quartz. When the mortar dries, the mica particles can create weak planes that can cause the mortar to crack or break under stress.
Increases Water Demand
In addition to reducing the strength of the mortar, mica can also increase the water demand of the mixture. This is because mica particles are hydrophilic, meaning that they attract water. As a result, more water may be needed to achieve the desired consistency of the mortar.
Conclusion
In conclusion, the presence of a large percentage of mica in sand can have a negative effect on the strength of mortar. It can create weak planes in the mortar that can cause it to crack or break under stress. Additionally, it can increase the water demand of the mixture. Therefore, it is important to carefully analyze the sand used in mortar and ensure that the percentage of mica is not too high.
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When percentage of mica present in sand is large it:a)Reduces strength of mortarb)Increases strength of mortarc)No effect on strengthd)Increases strength to smaller extentCorrect answer is option 'A'. Can you explain this answer?
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