Abstract
Reinforced-concrete slabs were cast and tested for durability for a period of fifteen months. The slabs were partially immersed in a 2.0% chloride ion solution. Three types of concrete were tested. These were normal-weight medium strength (NWMS), lightweight high-strength (LWHS), and normal-weight high strength (NWHS) concrete. The main tests consisted of measurement of corrosion potential, corrosion current and chloride ion penetration. It has been found that the values of corrosion potential and current were substantially different in the three different types tested. Extremely low values of corrosion current were detected in high strength concrete slabs whether made of lightweight or normal-weight concrete. Large amount of cementitious materials and very low ratio of water to cementitious materials are believed to strongly contribute to produce very low corrosion current. However, LWHS slabs exhibited very high values of corrosion potential while corrosion current values for these slabs were extremely low. The paper presents the results and discusses likely explanation of these observations.
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