PCC Pavement Patching Materials and Procedures

Abstract

Laboratory and field studies are conducted to evaluate three rapid‐setting PCC pavement patch materials and several construction techniques. Laboratory mix design studies reveal that PCC with and without steel fibers can be produced with early strengths adequate for one‐day patch construction. Four‐hour compressive strengths for these materials are lower than proprietary patch material, but after 5–6 hours their strengths are higher. Anchor optimization studies indicate that ultimate loads resisted by simulated patches are linearly proportional to the amount of anchor steel and that smaller anchor sizes perform best. During a field study the effects of pavement location and condition, construction temperature, anchors and sawing to outline patch areas are evaluated. Patches constructed of fibrous PCC perform best. The inclusion of anchors does not improve patch performance. Patches constructed during warm weather perform better than those constructed during cool weather. Patch performance is influenced by overall pavement condition with better patch performance on pavements with better condition. Sawing to outline patch area improves patch performance and aids patch construction.