Durability is the property of aggregate to withstand the adverse actions of weather and remain structurally sound over time. It is an important characteristic as it determines the lifespan and performance of the aggregate in construction applications. Durability is influenced by various factors such as the composition, shape, size, and surface texture of the aggregate particles.

Factors Affecting Durability:
1. Composition: The chemical composition of the aggregate plays a significant role in determining its durability. Aggregates with high silica content are more resistant to weathering, while those with high carbonate content may be prone to deterioration in acidic environments.

2. Shape: The shape of the aggregate particles affects the durability by influencing the interlocking and bonding between them. Angular and rough-surfaced aggregates provide better interlocking, resulting in improved durability compared to smooth and rounded particles.

3. Size: The size of the aggregate particles also affects durability. Smaller particles tend to have a larger surface area, making them more susceptible to weathering. On the other hand, larger particles may have internal flaws that can lead to cracking and deterioration.

4. Surface Texture: The surface texture of the aggregate influences its resistance to weathering. Rough-textured aggregates provide better adhesion with the surrounding matrix, enhancing durability.

Importance of Durability in Construction:
1. Longevity: Durability ensures that the aggregate will remain intact and maintain its structural integrity over time, leading to a longer lifespan of the construction.

2. Resistance to Weathering: Durability helps the aggregate withstand the adverse effects of weathering, such as freeze-thaw cycles, moisture absorption, and chemical attacks. This resistance prevents the aggregate from deteriorating and maintains its load-bearing capacity.

3. Structural Stability: Durability is crucial for maintaining the structural stability of the construction. Deterioration of the aggregate can lead to cracking, spalling, and loss of strength, compromising the overall stability of the structure.

4. Cost-effectiveness: Using durable aggregates reduces the need for frequent repairs and replacements, resulting in cost savings over the lifespan of the construction.

Conclusion:
Durability is an essential property of aggregate in construction. It ensures that the aggregate can withstand the adverse actions of weather and remain structurally sound over time. Factors such as composition, shape, size, and surface texture influence the durability of the aggregate. Considering the importance of durability in construction, it is crucial to select aggregates that possess adequate durability characteristics to ensure the longevity and stability of the structure.