What material can be added to loose fill to improve traction?

Adding aggregate to loose fill significantly enhances traction due to its coarse and varied particle size, which creates a more stable and effective surface for movement. Aggregates, which can include a mix of gravel, crushed stone, and sand, provide interlocking and a larger surface area, resulting in superior grip compared to smoother or finer materials. This interlocking characteristic allows for better distribution of weight and decreases the likelihood of slipping, making it particularly useful in applications such as roads or pathways where enhanced traction is crucial for safety.

On the other hand, sand, gravel, and silt may offer varying benefits, but they do not provide the same level of stability and grip enhancement that a properly selected aggregate does. Sand can create a loose surface that may shift easily, gravel may not have the same particle diversity needed for optimal traction, and silt tends to retain moisture, which can lead to a slippery and unstable surface when wet. Therefore, aggregate stands out as the most effective choice for improving traction in loose fill scenarios.