Mohammad Tiznobaik, Mohamed T. Bassuoni
Natural Sciences and Engineering Research Council of Canada; University of Manitoba; Public Works Department, City of Winnipeg
Concrete curing, Concrete pavements, Durability, Microstructure, Pavement joints, Test sections
Signs of premature deterioration of concrete pavements are often indicated by shadowing, resulting from a network of micro-cracks in the vicinity of joints, which causes significant loss of material over time. In Canada, the construction sequence of concrete pavements typically involves continuous casting, applying curing compound and subsequently saw-cutting, which may compromise the durability of joints, due to insufficient curing and uncontrolled evaporation. The aim of this study was to assess the effect of overfilling joints with curing compound immediately after saw-cutting (early- and late-cuts) on improving the quality of concrete microstructure at joint regions in laboratory slabs and trial field sections. The study involved an absorption test customised to the joint geometry of pavements, mercury intrusion porosimetry and microscopy tests that were conducted on cores. The results indicated that overfilling the joints with curing compound immediately after late saw-cutting significantly improved the microstructure and durability of joint zones.