Độ bền của đập bê tông dưới sự ăn mòn Sun-phát bên ngoài

Abstract

External sulfate attack (ESA) affects the durability and strength capacity of concrete, especially for concrete dams that are in constant contact with water containing high concentrations of sulfate ions. In this paper, a concrete example of external sulfate attack on Mequinenza concrete dam is given. The formation of thaumasite mineral is harmful to the mechanical properties of concrete. Simulation of the external sulfate attack for concrete dam was conducted with the help of geochemical model. The model was successful in confirming the formation of thaumasite in the crust of concrete along with increased porosity which peeled off the concrete crust. That was observed in real construction. Based on the ressults, geochemical model can help to predict the durability of concrete construction.