Explanation:

When cement is stored for a long period of time, it goes through a process called hydration. During hydration, the chemicals in cement react with water and form chemical bonds, which ultimately give the cement its strength. However, if cement is not stored properly, it can be exposed to moisture, which can lead to a decrease in its strength.

Factors that affect the strength of cement during storage:

1. Moisture: Moisture is one of the main factors that can affect the strength of cement during storage. If cement is exposed to excessive moisture, it can cause the chemical reactions to occur prematurely, leading to a decrease in strength. Additionally, moisture can also cause the cement particles to stick together, forming lumps, which can further reduce its strength.

2. Air: Air can also have an impact on the strength of cement during storage. When cement is exposed to air, it can react with carbon dioxide, leading to a process called carbonation. Carbonation can reduce the pH of the cement and weaken its structure, resulting in a decrease in strength.

3. Temperature: Temperature can also affect the strength of cement during storage. Extreme temperatures, such as high heat or freezing cold, can cause the cement particles to expand or contract, leading to cracks and degradation of its strength.

Effect of improper storage on cement strength:

When cement is not stored properly and is exposed to moisture, air, or extreme temperatures, it can lead to a decrease in its strength. Moisture can cause premature hydration and the formation of lumps, air can lead to carbonation and weakening of the structure, and temperature fluctuations can result in cracks and degradation.

Conclusion:

In conclusion, the strength of cement decreases when it is improperly stored due to the effects of moisture, air, and temperature fluctuations. It is important to store cement in a dry and controlled environment to maintain its strength and quality.