Rut-resistant HMA mixtures are more susceptible to segregation due to:

Rut-resistant HMA mixtures are designed to withstand the deformation that can occur under traffic loads, which is often caused by high temperatures and repeated stress. One of the key factors that influences the performance and durability of these mixtures is the balance of asphalt binder and aggregates.

When there is a decrease in asphalt binder, the mixture may become more susceptible to segregation. This is because asphalt binder plays a crucial role in binding the aggregate particles together and ensuring a homogeneous distribution within the mix. A lower amount of binder can lead to a less cohesive structure, making it easier for the aggregates to separate during handling, transporting, and placing. Segregation can manifest as inconsistencies in the aggregate size distribution, which in turn can affect the overall performance of the mixture, potentially leading to rutting or early pavement failure.

The other choices do not have the same direct impact on susceptibility to segregation. For instance, minimizing aggregate contact or changes in the strength of the mixture do not directly relate to how well the components of the HMA blend together during production and application. Meanwhile, an increase in asphalt binder typically aids in improving the mixture's cohesiveness and helps resist segregation. Therefore, the dynamics of asphalt binder content are critical in influencing the susceptibility of rut-resistant HMA mixtures to