期刊
COMPOSITES PART B-ENGINEERING
卷 199, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2020.108235
关键词
Calcium silicate hydrate; Carrot nanomaterial; Molecular dynamics simulation; Mechanical properties; Cementitious nanocomposites
资金
- European Commission Horizon 2020 Marie Sklodowska-Curie Research Grant (BSMART) [799658]
- China International Collaboration Fund [G20190017133]
- Marie Curie Actions (MSCA) [799658] Funding Source: Marie Curie Actions (MSCA)
Concrete is currently produced at a rate of 20 billion tonnes per year and contributes 5-10% of mankind's CO2 production. If the strength of the calcium-silicate-hydrate (C-S-H), the main binding material of concrete, could be improved, the volume of cementitious material needed for a given structure would be reduced and its environmental impact would be decreased. Here, we show that the constitutive behavior of C-S-H can be improved significantly by complexation with carrot-based cellulose nanosheets (CNSs). This environmentally friendly, reinforcing material heals the defective microstructure of C-S-H, which is responsible for structural deformation and failure at larger length scales. CNSs are built from repeating saccharide units that are covalently linked by a beta-1-4 glycosidic (C-O-C) bond. The CNSs show remarkable affinity to C-S-H due to the interfacial Ca-O coordination and H-bond interaction. The functional groups on the surface of the CNS sheet act as a mot network, cross-linking the neighboring silicate calcium layers and inhibiting the water dynamics at the silicate nanochannel, thereby significantly improving the interfacial properties of the C-S-H/CNS hybrid structure. The macro experimental results show that the mechanical properties of the composites increase with increasing the concentration of CNSs up to 0.4-wt%. At 28 days and CNS concentration of 0.20-wt%, the flexural strength increases by about 23.2% and the compressive strength increases by about 17.5%. The developed atomic-scale molecular dynamics simulations, combined with top-down experimental measurements of their mechanical properties reveal that the proposed C-S-H/CNS composites show significant enhancement in strength, stiffness and ductility, and provide a foundation for the development of new high-performance construction materials with lower carbon footprint.
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