Uniaxial Compression Characteristics of Basalt Fiber Reinforced Foam Concrete in Freeze-Thaw Environments
To study the effects of density,fiber content,and freeze-thaw cycles on the uniaxial compressive properties of basalt fiber reinforced foam concrete(BFRFC),the pore structure of the specimens was examined by X-CT technology and analyzed by Avizo software.Uniaxial compression tests for BFRFC samples were conducted with various density levels(i.e.,800 kg/m3 and 1 000 kg/m3)and fiber contents(i.e.,0%,0.15%,0.30%,0.45%)under different freeze-thaw environments.The uniaxial compressive properties of BFRFC under different influencing factors were analyzed,and the relationship between each factor and compressive strength was assessed using grey relational analysis.A machine learning algorithm model was employed to predict compressive strength.The results indicate that the incorporation of basalt fibers effectively enhances the freeze-thaw resistance of foamed concrete.The strength loss rates after 80 freeze-thaw cycles for specimens with 0.15%,0.30%,and 0.45%fiber content were 75.2%,46.2%,and 37.8%,respectively.The density level has the highest correlation with compressive strength,with the grey relational degree of 0.799,followed by fiber content with the correlation coefficient of 0.723.The long short-term memory network model optimized by the grey wolf algorithm demonstrates good predictive performance for the compressive strength of basalt fiber reinforced foam concrete.
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