Mechanical Properties of SiO2/KH560 Modified Basalt Fiber Reinforced Concrete

Abstract

Abstract: 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.

Key words: nano-silica, basalt fiber, fiber reinforced concrete, silane coupling agent, orthogonal test, mechanical property

CLC Number:

TU528

YANG Xin, YU Kui, JI Fengchun, NIE Tangzhe, LI Ke, BAI Tian. Mechanical Properties of SiO₂/KH560 Modified Basalt Fiber Reinforced Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 102-112.

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Mechanical Properties of SiO₂/KH560 Modified Basalt Fiber Reinforced Concrete

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