Study on experiment of concrete mixed with II degree flyash under the corrosion of freeze thawing

As an industrial waste, fly ash has been widely used in bulk and low strength concrete. Bridges have to endure numerous freeze-thaw cycles and the erosion of air pollution when exposed to air. Therefore, the durability investigation of fly ash concrete bridge in the extremely cold area is necessary. In this paper, the concrete (designated as C50 fly ash concrete) was prepared by mixing II degree fly ash with water, cement, and water reducing agent. The water-cement ratio was selected by contrast analyses of several samples. The strength of C50 fly ash concrete was tested after 150 freeze-thaw cycles and corrosion in Na 2SO 4 and HC1 solutions of different concentrations, respectively. The strength declination was achieved, which is similar to the ordinary concrete. As the erosion liquid concentration increased, its influence on strength of concrete also increased. The conclusions of this paper provide important reference data for the design and application of fly ash concrete in cold regions. © 2009 ASCE.