DEGRADATION PROMOTION EXPOSURE TESTS TO IMPROVE PRECISION OF AGING PREDICTION IN FISHING PORT FACILITIES

Abstract

 The function diagnosis for fishing port facilities has a lot of issues such as simplifying use and improving accuracy of results and degradation prediction. In addition, concrete parts of the facilities have been exposing and deteriorating by hydrosulfate in seawater. It is pointed out that an intermittent long term survey is necessary, because its deterioration become worse over time.
 We aimed to contribute improving accuracy of nondestructive inspection technique in this research; checking out changings of the shape and compressive strength in long-term seawater exposure, and comparing with the dynamic elastic modulus, the surface of P wave speed, and the mechanical impedance value measured by the non-destructive inspection.
 The result showed that exposed concretes by seawater were consistent with reported results. Also, deterioration (skinned) on concrete surface was caused by magnesium sulfate.
 As a result, weight of the test-piece was decreased, and adding magnesium sulfate led acceleration of deterioration in the dynamic elastic modulus and compressive strength.