QUANTITATIVE ESTIMATION OF SURFACE CHLORIDE CONCENTRATION OF CONCRETE COMBINED WITH COASTAL GEOGRAPHICAL CONDITIONS

Abstract

 Airborne chlorides from sea surface consists of small particle of seawater, generated by interaction of wave, wind and coastal structures. Airborne chlorides, which is transported by wind sticks to the surface of structures, harms long-term durability of the structures. In this study, field observation of surface chloride concentration from sea surface were carried out in the coast where the wave-dissipating concrete blocks were installed. Prediction model for surface chloride concentration, based on geographical condition in the coast, is also developed. From the results, it was shown that the amount of the surface chloride is related to the geographical condition that wave-dissipating concrete blocks installed in the coast. The increased amount of surface chloride is estimated by classifying and quantifying a locations of the wave-dissipating concrete blocks. It was confirmed that calculation results of surface chloride concentration of concrete agree with the field measurements data.