Effect of Salt Spray Corrosion on Durability Performance of Fiber Concrete Based on GM（1，1）-Markov Model

Abstract:

Taking the volume fraction of basalt-polycinyl alcohol（PVA） fiber as the variable parameter， the indoor salt spray accelerated corrosion test was carried out. The damage and deterioration was evaluated and analyzed from the macro and micro aspects through the compressive corrosion resistance coefficient K_f， relative quality evaluation parameter ξ₁， relative dynamic elastic modulus evaluation parameter ξ₂ and scanning electron microscope （SEM） images， and the life of the fiber concrete was predicted based on GM（1，1）-Markov model. The results show that the K_f of the fiber concrete increases first and then decreases in the salt spray environment， ξ₁ fluctuates greatly， and ξ₂ can be used as the decisive factor for evaluate the damage and deterioration of fiber concrete. The data based on GM（1，1）-Markov model agrees well with the test data. The optimum volume fraction of basalt and PVA fiber is 0.10% and 0.01% respectively. The specimen with the optimum volume fraction has the longest service time under the salt spray environment， reaching 680 d.