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As a professional with expertise in various industries, I have come across a common question that many people ask: Why is lime not used in cement? The answer to this question is not as straightforward as one might think. In this post, I will delve into the reasons why lime is not used in cement and provide a comprehensive explanation.

Firstly, it is important to understand that cement is a mixture of several components, including limestone, clay, and gypsum. These components are heated at high temperatures to form a powder that is then mixed with water to create a paste. This paste hardens over time to form concrete.

Lime, on the other hand, is a component that is often used in mortar, which is a mixture of cement, sand, and water. Lime is added to mortar to improve its workability and durability. However, when it comes to cement, lime is not used for several reasons.

One of the main reasons why lime is not used in cement is that it can cause the cement to expand and crack. This is because lime reacts with the other components in cement, such as the clay and gypsum, to form compounds that have a higher volume than the original components. This expansion can cause the cement to crack, which can compromise its strength and durability.

Another reason why lime is not used in cement is that it can affect the setting time of the cement. Cement sets and hardens through a process called hydration, which involves the reaction of water with the cement components. Lime can interfere with this process and cause the cement to set too quickly or too slowly, which can affect its strength and durability.

In conclusion, while lime is a useful component in mortar, it is not used in cement due to its potential to cause expansion and cracking, as well as its effect on the setting time of the cement. It is important to understand the properties of each component in cement and how they interact with each other to ensure the strength and durability of the final product.

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