Paper and Presentation by Chon, Beom-Jun Lee, Min-Chul LIM, Jin-Sun Kim, Ki-Heun & Kil, Yong-Su from ASCP 4th Concrete Pavements Conference 2017
Since 1980s when continuously reinforced concrete pavement (CRCP) was applied on a large scale to Jungbu Expressway, CRCP has rarely been applied in Korea due to the reluctance in transverse cracks and relatively high construction cost. Recently, however, CRCP has been considered as an alternative as it requires relatively small amount of maintenance and repair cost and has higher design life compared to alternative construction methods.
As mountains make up 63.2% of the Korean landmass, many bridges and tunnels have been built for constructing expressways and national highways. Therefore, it is difficult to apply CRCP, which uses reinforcing bars (rebar) in the construction, due to the spatial limitations.
To overcome such problems, the mechanical tube feeding method was researched and developed for CRCP, as it can be used within the width of paved roads without spatial limitations.
The construction method was developed in two ways and applied to the construction site. First, the mechanical feeding machine is placed at the front part of the paver to pour the concrete and then arrange the rebar. Second, the mechanical feeding machine is designed to combine with the paver so that auto arrangement of the rebar and placement of concrete can be done simultaneously and be detachable at the beginning and ending of the construction.
Each piece of equipment has been applied to many highway construction sites in Korea. One section to which mechanical CRCP method was applied is in service as of now. Other sections are scheduled to open in June this year.
As a result of monitoring the sections constructed with this research method, they showed patterns similar to general CRCP, in terms of crack width and distance between cracks. Through coring, examination with naked eyes, and non-destructive inspection at the time of construction, it was confirmed that the rebar was arranged in the correct locations according to design standards.