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Consider the following statements: High early strength of cement is obtained as a result of
1. fine grinding
2. decreasing the lime content
3. burning at higher temperatures
4. increasing the quantity of gypsum
Which of these statements are correct
1. fine grinding
2. decreasing the lime content
3. burning at higher temperatures
4. increasing the quantity of gypsum
Which of these statements are correct
- a)1 and 2
- b)1, 2 and 3
- c)2, 3 and 4
- d)1,3 and 4
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Consider the following statements: High early strength of cement is ob...
On increasing fineness setting time decreases. So early gain of strength with decrease in lime content quick setting takes place.
On increasing Gypsum Initial setting time increases.
On increasing Gypsum Initial setting time increases.
Most Upvoted Answer
Consider the following statements: High early strength of cement is ob...
The correct answer is option 'B', which means statements 1, 2, and 3 are correct. Let's discuss each statement in detail:
1. Fine grinding:
Fine grinding of cement is done to increase its surface area and reactivity. When cement particles are finely ground, they have a larger total surface area available for chemical reactions to occur. This leads to faster hydration and setting of cement, resulting in higher early strength development.
2. Decreasing the lime content:
Lime (calcium oxide) is one of the main components of cement. It reacts with water during the hydration process to form calcium silicate hydrate (C-S-H) gel, which is responsible for the strength development of cement. However, excess lime content can lead to delayed setting and strength gain. By decreasing the lime content, the cement composition is optimized, leading to better early strength development.
3. Burning at higher temperatures:
The process of cement manufacturing involves burning raw materials, such as limestone, clay, and shale, at high temperatures in a kiln. Burning at higher temperatures promotes the formation of more reactive compounds, such as tricalcium silicate (C3S) and dicalcium silicate (C2S), which are responsible for the strength development of cement. These compounds form more rapidly at higher temperatures, leading to higher early strength.
4. Increasing the quantity of gypsum:
Gypsum (calcium sulfate) is added to cement during the grinding stage to control the setting time. It acts as a retarder, slowing down the hydration process and extending the setting time. Increasing the quantity of gypsum can delay the setting time and reduce the early strength of cement. Therefore, statement 4 is incorrect.
In summary, fine grinding increases the surface area and reactivity of cement particles, decreasing the lime content optimizes the cement composition, and burning at higher temperatures promotes the formation of more reactive compounds. These factors contribute to the high early strength development of cement.
1. Fine grinding:
Fine grinding of cement is done to increase its surface area and reactivity. When cement particles are finely ground, they have a larger total surface area available for chemical reactions to occur. This leads to faster hydration and setting of cement, resulting in higher early strength development.
2. Decreasing the lime content:
Lime (calcium oxide) is one of the main components of cement. It reacts with water during the hydration process to form calcium silicate hydrate (C-S-H) gel, which is responsible for the strength development of cement. However, excess lime content can lead to delayed setting and strength gain. By decreasing the lime content, the cement composition is optimized, leading to better early strength development.
3. Burning at higher temperatures:
The process of cement manufacturing involves burning raw materials, such as limestone, clay, and shale, at high temperatures in a kiln. Burning at higher temperatures promotes the formation of more reactive compounds, such as tricalcium silicate (C3S) and dicalcium silicate (C2S), which are responsible for the strength development of cement. These compounds form more rapidly at higher temperatures, leading to higher early strength.
4. Increasing the quantity of gypsum:
Gypsum (calcium sulfate) is added to cement during the grinding stage to control the setting time. It acts as a retarder, slowing down the hydration process and extending the setting time. Increasing the quantity of gypsum can delay the setting time and reduce the early strength of cement. Therefore, statement 4 is incorrect.
In summary, fine grinding increases the surface area and reactivity of cement particles, decreasing the lime content optimizes the cement composition, and burning at higher temperatures promotes the formation of more reactive compounds. These factors contribute to the high early strength development of cement.
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Consider the following statements: High early strength of cement is obtained as a result of1. fine grinding2. decreasing the lime content3. burning at higher temperatures4. increasing the quantity of gypsumWhich of these statements are correcta)1 and 2b)1, 2 and 3c)2, 3 and 4d)1,3 and 4Correct answer is option 'B'. Can you explain this answer?
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