Concrete is a durable material that can last for decades with proper care. However, it is not immune to deterioration. The most common cause of concrete degradation is water damage. When water seeps into the concrete, it expands and puts pressure on the surrounding materials. This can cause cracking, spalling, and pitting. In addition, freeze-thaw cycles can also damage concrete by causing the expansion and contraction of water within the material. Another cause of concrete deterioration is chemicals. Acids, alkalis, and salt can all break down the concrete over time. In general, concrete starts to show signs of wear and tear after about 20 years. However, with proper maintenance, it can last for much longer.