The correct answer is: Cement containing excess amount of lime cracks during setting.
Explanation:
Cement is a binding agent that is used to hold together other materials, such as sand and gravel, to form concrete. It is made from limestone, clay, and iron ore, which are heated together to form clinker. The clinker is then ground into a powder and mixed with gypsum to form cement.
The amount of lime in cement can vary depending on the type of cement being used. Portland cement, which is the most common type of cement, contains about 60% lime. Other types of cement, such as high-alumina cement and pozzolanic cement, contain less lime.
The amount of lime in cement can affect the properties of the concrete. Concrete that contains too much lime can be more likely to crack during setting. This is because lime reacts with water to form calcium hydroxide, which is a weak material. When calcium hydroxide forms, it can cause the concrete to expand and crack.
To prevent cracking, it is important to use the correct amount of lime in cement. The amount of lime that is needed will vary depending on the type of cement being used and the desired properties of the concrete. It is always best to consult with a professional before using cement to ensure that the correct amount of lime is used.
Here is a brief explanation of each option:
- Option A: Cement containing excess amount of lime cracks during setting. This is the correct answer.
- Option B: Becomes more strong. This is not always the case. Concrete that contains too much lime can be more likely to crack during setting, which can weaken the concrete.
- Option C: Is slow setting. This is not always the case. The setting time of concrete can vary depending on the type of cement being used and the other materials that are used in the concrete.
- Option D: Is quick setting. This is not always the case. The setting time of concrete can vary depending on the type of cement being used and the other materials that are used in the concrete.