Using Graphene Sulfonate Nanosheets to Improve the Properties of Siliceous Sacrificial Materials: An Experimental and Molecular Dynamics Study
| Autor: | Danqian Wang, Wang Lanxin, Ju Siyi, Yu Zhang, Fengjuan Wang, Zifei Wang, Chu Hongyan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
pore structure Composite number 0211 other engineering and technologies 02 engineering and technology mechanical properties lcsh:Technology Article graphene sulfonate nanosheets (GSNs) chemistry.chemical_compound ablation behavior Differential scanning calorimetry Flexural strength 021105 building & construction General Materials Science Porosity lcsh:Microscopy lcsh:QC120-168.85 Cement lcsh:QH201-278.5 sacrificial materials lcsh:T 021001 nanoscience & nanotechnology Compressive strength chemistry Chemical engineering lcsh:TA1-2040 Calcium silicate lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering Mortar 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
| Zdroj: | Materials, Vol 13, Iss 4824, p 4824 (2020) Materials Volume 13 Issue 21 |
| ISSN: | 1996-1944 |
| Popis: | The fabrication of high-performance cement-based materials has benefited greatly from the extensive use of graphene and its derivatives. This paper studies the effects of graphene sulfonate nanosheets (GSNSs) on sacrificial cement paste and mortar (the tested materials) and other siliceous sacrificial materials, especially their ablation behaviors and mechanical properties. Decomposition temperatures and differential scanning calorimetry were used to examine how different contents of GSNSs determines the corresponding decomposition enthalpy of the tested materials and their ablation behaviors. Molecular dynamics was also used to clarify the mechanism how the GSNSs work in the CSH (calcium silicate hydrated)/GSNSs composite to increase the resistance to high temperature. The experimental results show that: (1) the contents of GSNSs at 0.03 wt.%, 0.1 wt.%, and 0.3 wt.% brought an increase of 10.97%, 22.21%, and 17.56%, respectively, in the flexural strength of siliceous sacrificial mortar, and an increase of 1.92%, 9.16%, and 6.70% in its compressive strength (2) the porosity of siliceous sacrificial mortar was decreased by 5.04%, 9.91%, and 7.13%, respectively, and the threshold pore diameter of siliceous sacrificial mortar was decreased by 13.06%, 35.39%, and 24.02%, when the contents of GSNSs were 0.03 wt.%, 0.1 wt.%, and 0.3 wt.%, respectively (3) a decline of 11.16%, 28.50%, and 61.01% was found in the ablation velocity of siliceous sacrificial mortar, when the contents of GSNSs were 0.03 wt.%, 0.1 wt.%, and 0.3 wt.%, respectively (4) when considering the ablation velocities and mechanical properties of siliceous sacrificial materials, 0.1 wt.% GSNSs was considered to be the optimal amount (5) the GSNSs contribute to the reinforced effect of GSNSs on CSH gel through the grab of dissociated calcium and water molecules, and the chemical reaction with silicate tetrahedron to produce S&ndash O&ndash Si bonds. These results are expected to promoting the development of new kinds of siliceous sacrificial materials that contain GSNSs. |
| Databáze: | OpenAIRE |
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