Maintenance and Rehabilitation

Rigid Pavement Maintenance (PCC)

An overview of techniques used for preventive and corrective maintenance on rigid pavements.

Figure 3. Gang-Mounted Diamond Saw Blades.

Diamond Grinding

Diamond grinding (Figure 1) refers to a process where gang-mounted diamond saw blades (Figures 2 and 3) are used to shave off a thin, 1.5 – 19 mm (0.06 – 0.75 inch) top layer of an existing PCC surface in order to restore smoothness and friction characteristics. Most often, it is used to restore roadway … Read more »

Figure 3. Construction joint failure

Joint Repair

In PCC pavements, joints are provided to accommodate concrete volume changes due to temperature and moisture variations. Additionally, transverse construction joints are installed as a terminus following the end of production or abutment to existing pavement. In concrete pavement contraction design (CPCD), both transverse and longitudinal joints are used. Only longitudinal joints are used in … Read more »

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Slab Stabilization

Slab stabilization seeks to fill voids beneath the slab caused by pumping, consolidation or other means. If left untreated, these voids, which are often quite small (on the order of 3 mm (0.125 inches) deep), may cause other problems such as faulting, corner breaks or cracking (ACPA, 1995[1]). Voids are typically filled by pumping grout … Read more »

Figure 2. Joint sealing close-up.

PCC Joint and Crack Sealing

Sealant products are used to fill joints (Figures 1 and 2) and cracks in order to prevent entry of water or other non-compressible substances.  Although most PCC pavement joints are sealed at the time of new construction, the useful sealant life is limited as stated by the ACPA (2001[1]) on their web site: “A typical hot-pour … Read more »