Rights statement: This is the author’s version of a work that was accepted for publication in Composites Part B: Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Composites Part B: Engineering, 199, 2020 DOI: 10.1016/j.compositesb.2020.108235
Accepted author manuscript, 6.57 MB, PDF document
Available under license: CC BY-NC-ND: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
Accepted author manuscript, 8.75 MB, PDF document
Available under license: CC BY-NC-ND: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Carrot-based covalently bonded saccharides as a new 2D material for healing defective calcium-silicate-hydrate in cement
T2 - Integrating atomistic computational simulation with experimental studies
AU - Chi, Yin
AU - Huang, Bo
AU - Saafi, Mohamed
AU - Ye, Jianqiao
AU - Lambert, Colin
N1 - This is the author’s version of a work that was accepted for publication in Composites Part B: Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Composites Part B: Engineering, 199, 2020 DOI: 10.1016/j.compositesb.2020.108235
PY - 2020/10/15
Y1 - 2020/10/15
N2 - 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-SH), 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 β-1-4 glycosidic (C-O-C) bond. The CNSs show remarkableaffinity 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 root 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-SH/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 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.
AB - 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-SH), 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 β-1-4 glycosidic (C-O-C) bond. The CNSs show remarkableaffinity 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 root 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-SH/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 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.
KW - Calcium silicate hydrate
KW - Carrot nanomaterial
KW - Molecular dynamics simulation
KW - Mechanical properties
KW - Cementitious nanocomposites
U2 - 10.1016/j.compositesb.2020.108235
DO - 10.1016/j.compositesb.2020.108235
M3 - Journal article
VL - 199
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
SN - 1359-8368
M1 - 108235
ER -