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Molecular dynamics method is adopted to investigate the effect of different NaCl solutions concentrations on the bonding properties of the calcium silicate hydrate/γ-FeOOH(C-S-H/γ-FeOOH) interface. The effect mechanism of NaCl solution concentration is revealed from the interface ion evolution, radial distribution function, particle strength distribution, interaction energy and mechanical properties. The results show that as the concentration of NaCl solution increases, interlayer ions separate from the surface of C-S-H and diffuse to the interlayer solution, Na+ ions enter the C-S-H layer. ions adsorb Cl- ions in the solution, resulting in the ion clusters of and Cl- on the surface of C-S-H. In addition, the γ-FeOOH surface hydroxyl oscillation provides adsorption points for ions, resulting in the increase of Na+ ions on the γ-FeOOH surface. When the NaCl solution concentration increased, the RDF peak of Cah—Os gradually decreased and the radial distribution function(RDF) peak of Cah—Ow, Cah—Cl, and Na—Os gradually increases, consistent with the ionic strength distribution. Where, Os is the oxygen on the silicon chain in C-S-H, and Ow is the oxygen in the interlayer solution water. ions form ionic bonds with Ow in water, leading to a reduction of Cah—Os ionic bonds on the C-S-H surface. Since the strength and stability of Cah—Os ionic bond are better than that of Cah—Ow,therefore, the C-S-H/γ-FeOOH interfacial interaction energy and peak stress both show a decreasing trend with the increase of NaCl solution concentration.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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