Mechanical Properties and Freeze-Thaw Durability of Basalt Fiber Reactive Powder Concrete

Basalt fiber has a great advantage on the mechanical properties and durability of reactive powder concrete (RPC) because of its superior mechanical properties and chemical corrosion resistance. In this paper, basalt fiber was adopted to modified RPC, and plain reactive powder concrete (PRPC), basalt fiber reactive powder concrete (BFRPC) and steel fiber reactive powder concrete (SFRPC) were prepared. The mechanical properties and freeze-thaw durability of BFRPC with different basalt fiber contents were tested and compared with PRPC and SFRPC to investigate the effects of basalt fiber contents and fiber type on the mechanical properties and freeze-thaw durability of RPC. Besides, the mass loss rate and compressive strength loss rate of RPC under two freeze-thaw conditions (fresh-water freeze-thaw and chloride-salt freeze-thaw) were tested to evaluate the effects of freeze-thaw conditions on the freeze-thaw durability of RPC. The experiment results showed that the mechanical properties and freeze-thaw resistance of RPC increased as the basalt fiber content increase. Compared with the fresh-water freeze-thaw cycle, the damage of the chloride-salt freeze-thaw cycle on RPC was great. Based on the freeze-thaw experiment results, it was found that SFRPC was sensitive to the corrosion of chloride salts and compared with the steel fiber, the improvement of basalt fiber on the freeze-thaw resistance of RPC was great.