Jointed reinforced concrete pavement (jrcp) develops transverse cracks as the drying and thermal shrinkage of the concrete is resisted by friction with the supporting layers. These cracks deteriorate with time and traffic because of loss of load transfer capacity. However, rapid deterioration of these cracks has been observed on some recently constructed projects. This rapid crack deterioration leads to accelerated maintenance requirements and shortened service lives.A synthesis of factors that may reduce aggregate interlock load transfer is presented, and research efforts currently under way at michigan state university aimed at evaluating the relative effects of several of these factors on transverse crack deterioration in jrcp aredescribed. The ongoing work involves the collection and analysis ofload transfer data from the testing of a series of large-scale pavement test specimens that are subjected to repeated applications of loads simulating the passage of heavy-truck traffic. The test variables selected for the study include type of coarse aggregate (virgin, recycled, and blend), source of coarse aggregate, foundation support, reinforcing steel quantity and type, and amount of slab tension. This paper appears in transportation research record no. 1307, Pavement analysis, design, rehabilitation, and environmental factors 1991.
Samenvatting