Field Survey of Cracks Occurred on Aged Concrete-Armored Coastal Dikes

摘要

The purpose of this study is to investigate, by means of field measurement, crack, unevenness, compressive strength and tilt of aged concrete armored coastal dikes constructed more than 40 years ago. It is revealed that cracks on the crown armoring of dike are classified into eight patterns and the probability of crack occurrence on the crown armoring is about 0.39, which is higher than those of the seaward and landward slopes armoring of dike. The maximum crack-widening speed per year after construction is about 0.32cm on the crown armoring and about 0.17cm on the landward slope armoring.