复合盐-冻侵蚀下玄武岩纤维混凝土的寿命预测OA

To explore the influence of basalt fiber on the mechanical properties and durability of con-crete,indoor rapid freeze-thaw tests were conducted to simulate the actual erosion environment.The evolution laws of mechanical properties of basalt fiber(BF)concrete with different volume fractions under freeze-thaw erosion in two media,namely clear water solution and 3％(mass fraction)NaCl+5％Na2SO4 composite salt solution,were analyzed.The deterioration laws of the microstructure of basalt fiber concrete were also analyzed by combining nuclear magnetic resonance and ultrasonic tests.Simultaneously,a life prediction model was established to predict the maximum service life of ba-salt fiber concrete structures.The research results show that the mechanical properties and microstruc-ture of the specimens are much more damaged during freeze-thaw in composite salt solution than in clear water.The mechanical properties of concrete with basalt fiber are all improved,and the salt-freeze resistance of concrete is the best when the fiber volume fraction is 0.15％.The life prediction re-sults of the grey prediction model and the Weibull model are roughly similar,among which the Weibull prediction model can accurately predict the service life of concrete.The research results can provide a theoretical basis for the study of concrete durability performance and the maintenance of hydraulic structures in cold and arid regions.