Understanding the acceleration impact of load and flowing water on the chloride ion transport properties of fly ash-based geopolymer concrete

Abstract

In this study, the acceleration impact of load and flowing water on the Cl− transport properties of fly ash-based geopolymer concrete (FABGC) was studied for concrete in a complex environment. The results showed that when the erosion age remained unchanged, the concentration of Cl− gradually decreased, and the proportion of bound Cl− increased with an increase in depth from the FABGC surface. At a constant depth from the FABGC surface, Cl− mainly exists in the form of free Cl−. Both flowing water erosion and loading promoted the transport of Cl−, and their combined effect was the primary factor influencing ion transport in the tension zone. When its content in FABGC is high, Al will change the gel structure in FABGC, thus inhibiting the transport of Cl−. A Cl− transport model considering multiple factors (such as the bound Cl−, load, porosity, and flowing water) was established, and its rationality was verified.