摘要
Abstract
To investigate the mechanism by which nano-silica affects the performance of low-carbon,early-strength hydraulic concrete and to enhance its early mechanical and durability properties,ferric aluminate cement is used to partially replace or-dinary portland cement to improve the early strength of hydraulic concrete.Additionally,nano-silica is externally added to opti-mize the microstructure of the concrete and enhance its overall performance.It was found that although the replacement of some ordinary portland cement with ferroaluminate cement could improve the early strength and corrosion resistance of hy-draulic concrete,it would also cause ettringite aggregation,which would adversely affect the later mechanical properties.The added nano-silica adsorbed on the surface of C3A to delay its hydration,making the ettringite more uniform.Meanwhile,nano-silica could also fill pores,optimize the pore structure,effectively reduce the adverse effects of iron aluminate cement,promote the steady growth of the mechanical properties of low-carbon early-strength hydraulic concrete,and improve the resistance of low-carbon early-strength hydraulic concrete to sulfate erosion and impermeability.关键词
水工混凝土/铁铝酸盐水泥/纳米二氧化硅/钙矾石/孔隙结构Key words
hydraulic concrete/iron aluminate cement/nano-silica/ettringite/pore structure分类
水利科学
