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Cement (includes mortar and concrete also) Video Lecture - JEE

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1. What is cement and how is it different from mortar and concrete?
Ans. Cement is a binding material used in construction that hardens and sets to form a solid structure. Mortar is a mixture of cement, sand, and water used to bond bricks, stones, or other materials together. Concrete, on the other hand, is a composite material made of cement, sand, gravel or crushed stone, and water, used for building foundations, walls, and other structures.
2. How is cement made?
Ans. Cement is made by heating a mixture of limestone and clay in a kiln at high temperatures. This process, known as calcination, forms a substance called clinker. The clinker is then ground into a fine powder and mixed with gypsum to produce cement.
3. What are the different types of cement available in the market?
Ans. There are several types of cement available, each with its own specific properties and uses. Some common types include Portland cement, which is the most widely used cement and suitable for general construction purposes, and specialized types such as sulfate-resistant cement, high-early-strength cement, and white cement.
4. How does cement harden and gain strength?
Ans. Cement hardens through a process called hydration. When water is added to cement, it reacts chemically to form a paste that binds the materials together. Over time, the chemical reactions continue, and the paste hardens, gaining strength. The process of hydration is gradual and can take several days or weeks for the cement to reach its full strength.
5. What are the factors that can affect the strength and durability of cement-based materials?
Ans. Several factors can affect the strength and durability of cement-based materials. These include the water-cement ratio, the quality and proportion of materials used, the curing conditions (such as temperature and humidity), the presence of additives or admixtures, and the proper construction practices. It is important to consider these factors to ensure the desired strength and durability of the cement-based structures.
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