EVALUATION OF SCALING PROGRESS IN HARBOR CONCRETE STRUCTURE IN HOKKAIDO DURING APPROXIMATELY 10 TO 40 YEARS

Abstract

Physical and chemical surveys of concrete were conducted on the upper crests of approximately 10 to 40 year old harbor breakwaters on coastal areas to analyze the progress of scaling. These surveys indicated that concrete with a compressive strength of 35MPa or more has high resistance to scaling. By integrating the results of the multiple regression analysis of surveyed data and affectors multiplied by weighting factors, we propose a scaling progression index (γ). Breakwaters with a logγ of approximately 0 or more show large scaling, confirming its effectiveness as a deterioration prediction method. This paper also discussed important points regarding the assessment of internal damage of concrete structure.