Chloride ingress into concrete under different conditions of temperature and marine zones

Abstract

Steel reinforcement corrosion due to chloride penetration into concrete is one of the main causes of degradation of marine structures, being the subject of many researches. Among the various factors that influence the chloride penetration into concrete are the environmental factors, such as temperature and exposure condition. In this context, the present study evaluated the chloride penetration in three different exposure regions (atmospheric, tidal variation and underwater) at the temperatures of 15°C, 20°C, 25°C, and 30°C over 18 months, collecting samples every 6 months, at depths of 1mm to 5mm. The environmental conditions were simulated in the laboratory. The results show a higher concentration of chlorides underwater. Moreover, the chloride concentration increases more intensively from 6 to 12 months and the temperature is more effective from 20°C. This article also shows that temperature effects are higher for advanced ages.