We study here the imbibition of a nanosilica-based product in a hardened cement-based material along with the consequences of the product on transport properties. We use X-ray microtomography to assess the liquid ingress in the cement-based matrix as a function of time. We moreover measure the consequences of the nanosilica treatment on water absorption and chloride penetration. Our results suggest that nano-silica imbibition in cement-based materials involves some deep particle clogging and, in turn, some phase separation in the porous cement-based material. As a consequence, the effective local concentration of nano-silica increases in a clogged zone located between a critical clogging depth and the surface. In this zone, the silica concentration level in the porosity allows for the formation of a physical barrier inside the material, which can, in turn, affect transport properties.

我们在这里研究了基于纳米二氧化硅的产品在硬化的水泥基材料中的吸收以及该产品对传输特性的影响。我们使用 X 射线显微断层扫描来评估水泥基基质中的液体进入随时间的变化。此外，我们还测量了纳米二氧化硅处理对吸水性和氯化物渗透的影响。我们的结果表明，水泥基材料中的纳米二氧化硅渗吸涉及一些深层颗粒堵塞，进而导致多孔水泥基材料中的一些相分离。因此，纳米二氧化硅的有效局部浓度在位于临界堵塞深度和表面之间的堵塞区域中增加。在这个区域，孔隙中的二氧化硅浓度水平允许在材料内部形成物理屏障，这可以，