Durability of basalt fiber-reinforced polymer bars in wet-dry cycles alkali-salt corrosion

Abstract

Basalt fiber-reinforced polymer (BFRP) bars have been increasingly applied to offshore structures, which are subjected to seawater corrosion and wet-dry cycles during their service time. This study evaluated the alkali-salt resistance performance of BFRP bars with different resin matrix types under wet-dry cycles. The tensile and shear strength of BFRP bars were tested. As a comparison, experiments of BFRP bars under continuous immersion were also conducted. The mechanisms of the two different conditions were analyzed by scanning electron microscopy (SEM). A relationship was established between the degradations under continuous immersion and wet-dry cycling. The results demonstrated that the alkali-salt resistance of vinyl resin matrix BFRP bars was superior to that of epoxy resin matrix BFRP bars under wet-dry cycles. Furthermore, according to the data obtained under continuous immersion, a time shift factor for predicting the durability of BFRP bars under wet-dry cycles was proposed.

Bond behavior between basalt fiber‐reinforced polymer rebars and coral‐reef‐sand concrete conditioned in saline solution

“…As shown in Figure , The type of conditioning has only a slight effect on the bond behavior. In general, wet‐dry cycling has less effects on materials than continuous immersion does . Thus, wet‐dry cycling also has negligible effects on the bond behavior of 12‐mm BFRP rebar and steel rebar.…”

“…In general, wet-dry cycling has less effects on materials than continuous immersion does. 35 Thus, wet-dry cycling also has negligible effects on the bond behavior of 12-mm BFRP rebar and steel rebar. For the steel rebars, the bond strength shows a larger increase under continuous immersion conditioning compared with that under wet-dry cycling conditioning, which indicates that continuous immersion provides more sufficient prolonged maturation of concrete.…”

“…In general, wet-dry cycling has less effects on materials than continuous immersion does. 35 Thus, wet-dry cycling also has negligible effects on the bond behavior of 12-mm BFRP rebar and steel rebar. For the steel rebars, the bond strength shows a larger increase under F I G U R E 1 1 Bond strength of conditioned basalt fiber-reinforced polymer (BFRP) and steel rebars F I G U R E 1 2 Bond strength of basalt fiber-reinforced polymer (BFRP) rebars after conditioned at different temperatures continuous immersion conditioning compared with that under wet-dry cycling conditioning, which indicates that continuous immersion provides more sufficient prolonged maturation of concrete.…”

Behavior of Basalt Fibers in an Alkaline Environment

“…Such a film has poor adhesion to the fiber itself; therefore, when stretched, the fiber stops working as a reinforcing component [14][15]. The experimental results of the authors of works [16][17] also confirm that basalt fibers have a relatively high resistance to water and salt corrosion, but are highly susceptible to destruction in an alkaline solution. It is also worth noting that the production of basalt fibers is associated with the need to dispose of a large amount of waste [19][20], which not only has a negative economic effect, but also has a harmful effect on the environment.…”