Study on the workability and early mechanical properties of carbon nanotube-coated fly ash modified cement-based grouting materials

• DOI: 10.1016/j.conbuildmat.2024.137327
• Publication Date: 2024-07-10T21:23:51Z
• Authors: Guansheng Han; Shaozhen Dai; Jiqing Zhang; Yuan Gao; Yanming Liu
• Keywords: Cementitious; Consolidation; Hydration reaction

Carbon nanotube (CNTs) reinforced cementitious composites have obvious advantages over traditional building materials in strength and impermeable durability. However, the material question has not been widely employed grouting engineering due to limitations posed by dispersion issues. This study introduces a novel method of using amino functional groups coat carbon nanotubes on surface fly ash improve dispersion. The objective is produce high-quality industrial-grade slurry facilitate transition from small-scale research large-scale applications. results show that mixing 14.3 wt% 0.023 CNTs can replace an equivalent proportion cement. Compared cement-based material, modified exhibit 21.6 % increase fluidity, 7.9 7-day consolidation strength, 11.9 reduction porosity consolidation. with large specific area provide sites for cement hydration reaction, accelerate hydration, form dense products. Additionally, interaction between products within microcracks matrix forms 'bridging role' enhances mechanical properties. effectiveness incorporating reducing micro-damage during loading process consolidation, enhancing integrity, improving material's resistance was further proved acoustic emission, scanning electron microscopy, fractal analysis fracture surface.