The current study investigates the performance of concrete incorporating ground granulated blast-furnace (GGBF) slag in the presence of colloidal nano-silica. A control group of concrete mixtures is compared with a group of mixtures with 50% slag replacement, with each group examined at two different ratios of colloidal nano-silica (3% and 6% of the total cementitious material). Subsequently, the relative performance of the two groups is compared with ordinary Portland cement concrete in relation to strength and durability properties. Evaluation included experimental examination of compressive and tensile strength, rapid chloride penetration, and porosimetry using mercury intrusion tests. Furthermore, the microstructure of the cementitious matrix was evaluated using scanning electron microscopy imaging. Results of the tested concrete mixtures indicated that nano-silica particles can improve the properties of concrete containing GGBF slag. Improvement in high early strength as well as reduction in permeability are observed. Furthermore, nano-silica caused a refinement of the pore structure and an improvement to the interfacial transition zone (ITZ) as seen through mercury intrusion porosimetry (MIP) results and scanning electron microscopy imaging, respectively.

当前的研究调查了在胶态纳米二氧化硅存在下掺入磨碎的高炉矿渣（GGBF）的混凝土的性能。将对照组的混凝土混合物与一组替代了50％炉渣的混合物进行比较，每一组均以两种不同的胶态纳米二氧化硅比例（分别占胶凝材料总量的3％和6％）进行检查。随后，在强度和耐久性方面，比较了两组与普通硅酸盐水泥混凝土的相对性能。评估包括抗压强度和拉伸强度，快速的氯化物渗透以及使用压汞试验的孔隙率法的实验检查。此外，使用扫描电子显微镜成像评价胶结基质的微观结构。测试的混凝土混合物的结果表明，纳米二氧化硅颗粒可以改善含GGBF渣的混凝土的性能。观察到高早期强度的改善以及渗透性的降低。此外，如分别通过压汞法（MIP）和扫描电子显微镜成像所见，纳米二氧化硅引起孔结构的细化和界面过渡区（ITZ）的改善。