Quality construction is a key factor in the long-term exceptional performance of CRCP and does not happen by chance.
In addition to guidance found in the Materials and Construction Optimization (MCO) Guidelines and elsewhere, the following items should be checked on CRCP projects:
- Crack widths that exceed the design criteria, which would be in the range of greater than 0.02 in. (0.5 mm)andpunchouts caused by:
- Insufficient steel lap length,
- Steel placed too low in the slab,
- Less-than-design slab thickness,
- More-than-design slab thickness, resulting in a reduced steel percentage,
- Poor bonding of the steel to the concrete caused by:
- Insufficient consolidation of the concrete,
- Sudden temperature drops greater than 20°F (10°C) during construction, and/or
- Steel heavily rusted, soiled, or coated with curing compounds, grease, or oils without adequate cleaning.
- Surface delaminations caused by steel too high in the slab, large temperature swings, or inadequate vibration.
- Punchouts in CRCP overlays due to a lack of repairs to serious underlying pavement deteriorations.
Construction related distress can be greatly minimized or even eliminated with proper attention to detail, care during construction, and sound quality control.