patchlaag

Patchlaag is a term used in Dutch civil engineering and construction to denote a repair layer applied to a damaged surface in order to restore functionality or serviceability. The word combines patch and laag, meaning layer, and is employed across road maintenance, bridge repair, and concrete work. The concept encompasses various patching technologies, including hot-mix asphalt patches, cold-patch materials, and cementitious or epoxy-based patches.

Applications and materials

Patchlaag is commonly used for pothole repairs, spalled concrete, and small-scale damage on pavements, bridge decks, and building façades. Materials employed for patchlagen include asphaltic mixtures (hot or cold patch), polymer-modified asphalt, cementitious mortars, and epoxy or polyurethane patch compounds. The choice of material depends on substrate type, expected load, exposure conditions, and required cure time.

Process and considerations

Typical work steps involve surface cleaning and removal of loose material, moisture assessment, priming or bonding agents if required, placement of patch material, compaction, and curing. Achieving a proper bond between the patchlaag and the substrate is crucial for durability. Patchlagen are generally intended as localized, relatively short-term repairs and may need reinforcement or subsequent resurfacing if underlying damage is extensive or if traffic loads are high. Weather conditions, temperature, and substrate condition influence installation and performance.

See also

Repair, pothole repair, pavement resurfacing, overlay, patch repair techniques.