Constructing Concrete Ramps
See FHWA’s CRCP Design and Construction Guidelines for the references included in this page. A new, more comprehensive FHWA CRCP Design, Construction, Maintenance and Rehabilitation manual is currently under development and this page will be updated upon its release in the spring of 2016.
Concrete ramps adjacent to mainline CRCP can be constructed as CRCP or jointed concrete pavement. Longitu- dinal joints between the ramp and mainline CRCP should be designed and tied as the lane-lane or lane-shoulder tied longitudinal joints that are discussed in Section 8.4 of this Guide.
When the ramp is constructed as CRCP or as a jointed concrete pavement with a joint spacing of 15 ft (5 m) or less; tiebars can be placed uniformly at the same spacing used in the adjacent longitudinal joint. If the ramp is constructed as a jointed concrete pavement with a joint spacing greater than 15 ft (5 m), only the middle third of each slab between joints should be tied because excessive stresses in the CRCP can result from large thermal movements of the tied ramp near transverse joints.(89)
Take extra care in the ramp concrete consolidation (especially around construction joints) and finishing to achieve concrete uniformity and satisfactory ride quality.
CRCP ramps will require terminal treatments at their point of transition to the adjoining roadway.