高性能水泥基纳米胶凝材料渗透性能及孔径分布试验研究

EXPERIMENTAL STUDIES ON PERMEABILITY PROPERTY AND PORE SIZE DISTRIBUTION OF HIGH PERFORMANCE NANO-BINDER CEMENTITIOUS COMPOSITES

摘要: 为解决混凝土脆性开裂引发的结构渗漏问题,该文提出一种新型高性能纳米改性水泥基复合材料(简称HPNCC)。借助砂浆抗渗仪和压汞仪,着重研究HPNCC材料在恒定水压作用下的渗透性能和微观孔隙分布。试验结果表明,HPNCC材料的相对渗透系数仅为3.64×10^-9cm/h,其抗渗性能是传统纤维增强水泥基复合材料(UHTCC)及普通混凝土的1000倍以上,微观孔隙尺寸更小,结构更为致密,具有优异的抗渗性能。

Abstract: To solve the seepage of concrete from brittle cracking, the paper introduced a new type of materials, named high performance nano-binder cementitious composites (HPNCC). The permeability property and pore size distribution of HPNCC were investigated through an impermeability instrument and a mercury porosimeter respectively. The experimental results indicated that the relative permeability coefficient of HPNCC with compact microstructures and smaller pore size exhibits only 3.64e-9cm/h. The impermeability of HPNCC is 1000 times better than that of fiber reinforced cementitious composites (UHTCC) and concrete.