What is the effect of excessive moisture on aggregate performance in base layers?

Excessive moisture in aggregate base layers can significantly compromise their performance. When aggregate materials absorb too much water, the overall stability of the base layer is adversely affected. This excessive moisture can lead to a variety of problems, including increased pore pressure within the material, which decreases friction between aggregate particles. As a result, the structural integrity is diminished, leading to issues such as weakening of the overall structure and increased deformation under load.

In addition, moisture can contribute to the erosion and displacement of the aggregates, leading to uneven settlement or heaving as the ground beneath reacts to changes in water content. These processes introduce instability into the base layer, posing risks to any structures that rely on the integrity of that aggregate base.

Understanding the impact of moisture on aggregate performance is crucial in construction and civil engineering, as it enables technicians to implement appropriate measures for moisture management, ensuring the longevity and efficacy of pavement bases.