Three concrete pavement restoration techniques are described andthe field performance of each is evaluated. Two of the three methods are used to restore the condition of continuously reinforced concrete pavements (crcp) and the other was used to repair failed joints and broken slabs in an old plain jointed concrete pavement (jcp). Each of the techniques and the analysis results are described. A repair technique using polymer concrete to restore load transfer and sealsurface cracks in several lane-miles of ih 610 in houston, texas, is described. This project, constructed in 1980, was surveyed in 1990. Results indicated that the majority of the repairs were intact after 10 years of heavy traffic. The area encompassing these polymer concrete repairs is currently being rehabilitated using a bonded overlay. One experimental section in the overlay project investigated theeffectiveness of methyl methacrylate as a mop on pretreatment of the existing crcp. Falling weight deflectometer (fwd) measurements taken before and after the treatment, as well as core analyses, indicated this technique to be only marginally effective in reducing deflection. A second technique used to repair longitudinal construction joints in crcp before rehabilitation is described. Load transfer was reestablished by epoxying reinforcing steel in slots cut perpendicular to the joint. Fwd measurements demonstrated this technique to be of significant benefit. Analyses indicated that the stress was reduced by as much as 40% through the use of this technique. The restoration of a two-lane jcp constructed in the 1930s was undertaken as partof an experimental test program to assess several rehabilitation options available for jcp. Deflection measurements were taken near transverse joints and longitudinal cracks before and after the repairs were made. Repairs were effected using precast joints and polymer concrete. Analyses indicated some reduction in deflection as the result of the restoration work. This paper appears in transportation research record no. 1307, Pavement analysis, design, rehabilitation, andenvironmental factors 1991.
Samenvatting