Abstract
This study introduces a multi-scale reinforced lightweight engineering geopolymer composite (LW-EGC) with functionalized multi-walled carbon nanotubes (MWCNTs) and PVA fibers. Ten groups of LW-EGCs with different functionalized MWCNTs and PVA fiber contents were designed. The flowability, mechanical properties, chemical characterization, and microstructure of the LW-EGCs were analyzed. The tensile strain was predicted by mid-span displacement. The results showed that LW-EGC-2.5–0.15 containing 2.50% PVA fibers and 0.15% functionalized MWCNTs had the maximum flexural and compressive strength (10.08 MPa and 36.78 MPa, respectively). Compared with the reference group, they increased by 208.57% and 22.60%, respectively. LW-EGC-2.0-0.15 had the maximum tensile strain capacity (7.52%), and the corresponding initial cracking strength and peak strength were 2.00 MPa and 2.61 MPa, respectively. It had excellent crack control ability, and the crack width was only 45.26 μm. In addition, the calculation results of bending toughness indexes and the residual bending strength indexes showed that LW-EGC had high bending toughness. EDS analysis showed that C-A-S-H and N-A-S-H were the main geopolymer products.
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