The Chloride Ion Penetration Mechanism in Basalt Fiber Reinforced Concrete under Compression after Elevated Temperatures

Abstract

Chloride ion penetration frequently leads to steel corrosion and reduces the durability of reinforced concrete. Although previous studies have investigated the chloride ion permeability of some fiber concrete, the chloride ion permeability of the basalt fiber reinforced concrete (BFRC) has not been widely investigated. Considering that BFRC may be subjected to various exposure environments, this paper focused on exploring the chloride ion permeability of BFRC under the coupling effect of elevated temperatures and compression. Results demonstrated that the chloride ion content in concrete increased linearly with temperature. After exposure to different elevated temperatures, the chloride ion content in BFRC varied greatly with increasing stress. The compressive stress ratio threshold for the chloride ion penetration was measured. A calculation model of BFRC chloride ion diffusion coefficient under the coupling effect of elevated temperatures and mechanical damage (loading test) was proposed.

Increasing the Corrosion Resistance and Durability of Geopolymer Concrete Structures of Agricultural Buildings Operating in Specific Conditions of Aggressive Environments of Livestock Buildings

“…So, according to the results of experimental studies, the best chloride diffusion resistance properties for 50% GGBFS and 30% FA in HPC were established with a coefficient of 0.37, showing the minimum value, and the effective porosity values decrease as follows: 9.89% for HPC, 7.30% for 30% FA in HPC, and 7.33% for 50% GGBFS in HPC. Furthermore, the assessment of the effect of class F fly ash on the durability of concrete, as carried out in [17], confirms the positive effect of this additive on the durability of concrete. Thus, concrete with the addition of fly ash showed lower water absorption and permeability for chlorides and a significant drop in sorption capacity and permeability for chlorides during the hardening period of 28-180 days [16][17][18].…”

“…Furthermore, the assessment of the effect of class F fly ash on the durability of concrete, as carried out in [17], confirms the positive effect of this additive on the durability of concrete. Thus, concrete with the addition of fly ash showed lower water absorption and permeability for chlorides and a significant drop in sorption capacity and permeability for chlorides during the hardening period of 28-180 days [16][17][18].…”