Mechanical Properties of SiO2/KH560 Modified Basalt Fiber Reinforced Concrete
To study the effect of silane coupling agent(KH560)and nano-SiO2 synergistically KH560 modified basalt fiber(BF)on the mechanical properties of concrete,KH560 was used to surface modify for BF to produce KH560-BF,and nano-SiO2 and KH560 were used to modify BF to produce SiO2-KH560-BF.Orthogonal tests were used to screene high-strength modified fibers,and the effects of mass fractions of nano-SiO2 dispersion,lubricant and KH560 on the filament bundle strength of SiO2-KH560-BF were investigated.The mechanical properties of modified concrete at 7 and 28 d were evaluated and the microstructure of the concrete was characterized by SEM and EDS.The results show that the optimal upper agent composition for SiO2-KH560-BF is nano-SiO2 dispersion 1.6％,lubricant 0.4％,and KH560 0.5％,and the degree of influence of the three factors is nano-SiO2 dispersion＞KH560＞lubricant.Compared with KH560-BF,the fiber tow strength of SiO2-KH560-BF increases by 8.62％,tensile strength increases by 4.41％,Si content increases by 24.9％,and there were fewer agglomerated buildups in the SEM images of SiO2-KH560-BF than those of KH560-BF.The 7 and 28 d compressive,split tensile,and axial compressive strength enhancement effects of the concrete with a moderate amount of SiO2-KH560-BF are higher than those of the concrete with KH560-BF.
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