Frost heave is cause by a deep freeze of poorly drained, fine soils. The free moisture in the soil expands when frozen. The freezing draws more moisture up and into the frozen layer to create an ice lens. When the ice expands, the sidewalk is pushed up. The photograph shows […]
A typical combination of thin pavement structure (combined asphalt concrete and aggregate base layers) on top of a water-saturated (often found near landscaped islands), weak, fine-grained soil (silt or clay) allows, over a long-term, the vehicle weight to push down on the pavement structure. The actual term is material creep. […]