What is a critical effect of moisture retention in aggregates during cold weather?

Moisture retention in aggregates during cold weather leads to frost susceptibility, which is a significant concern in construction practices. When water is present in the pores of aggregates and temperatures drop, that water can freeze. As water expands upon freezing, it can exert pressure on the surrounding material, leading to potential damage through cracking or fracturing. This issue can compromise the integrity of the aggregate base in road construction and other applications, affecting both the quality and longevity of the structure.

Understanding frost susceptibility is crucial since it not only influences the performance of the aggregate but also dictates the methods used for mixing and placing materials in cold weather conditions. Proper management of moisture during the construction process can help mitigate these risks, ensuring that the aggregates perform effectively under load and environmental stresses.