In contrast to routine maintenance treatments, periodic maintenance treatments are ideally applied on pavements prior to their manifestation of distresses. These treatments are intended to prolong the life of a pavement by restoring (or maintaining) desirable properties while such measures are still cost-effective. Periodic maintenance can delay future deterioration, or correct existing distresses, therefore they can be classified in preventive or corrective (reduce deterioration progress, or correct existing deterioration producing a step in the distress curve). Periodic maintenance works are divided into the following works types:
- PREVENTIVE TREATMENTS (P): This is the addition of a thin film of surfacing to improve surface integrity and waterproofing without increasing the strength of the pavement. Preventive maintenance treatments are most effective when they are applied to a surface that is intact (i.e., free from significant cracking or disintegration). Preventive maintenance treatments often do not contain any aggregate, or will contain an aggregate with a maximum size of 6,7 mm. Preventive treatments are not an effective means of addressing structural deterioration such as rutting and crocodile cracking.
- RESURFACING ( R ): This is the addition of a thin surfacing to improve surface integrity and waterproofing, or to improve skid resistance, without increasing the strength of the pavement significantly. They are sometimes referred to as “functional overlays,” as they are intended to restore or enhance the ability of the roadway to serve its purpose (function), but do not increase the load-carrying capabilities of the structure.