Full
WANG Xuechuan (1991-), male, Master, Engineer. E-mail: aritwxc@163.com
Outline
To study the promotion process of cement hydration by polycarboxylate superplasticizers modified calcium silicate hydrate (C-S-H/PCE) and understand the mechanism of C-S-H/PCE seeds promotion of cement hydration. Acrylic acid-based polycarboxylate superplasticizer (PCE-1) and silane-based polycarboxylate superplasticizer (PCE-2) were used to surface modify the hydrothermal synthesized calcium silicate hydrate (C-S-H/Unmodified) seeds, resulting in the polycarboxylate superplasticizer modified C-S-H seeds (C-S-H/PCE-1 and C-S-H/PCE-2). Subsequently, these three C-S-H seeds were added to the cement paste. The compressive strength, phase composition, and heat release curve of cement paste and the surface tension of C-S-H seeds were tested. The results showed that the surface modification of PCE-1 and PCE-2 resulted in an increase in the surface contact angle of C-S-H seeds from 36.9° to 41.1° and 42.9°, resulting in lattice mismatch of the sedimentary phase (hydration product) on the surface of the substrate material (C-S-H seeds) and inhibiting the epitaxial growth of cement hydration products on the surface of C-S-H seeds. PCE modification reduced the promoting effect of C-S-H seeds on the hydration process of Portland cement. Moreover, the degree of reduction in the hydration promoting effect of C-S-H/PCE-2 on Portland cement is significantly greater than that of C-S-H/PCE-1 crystal nucleus. Tests of the adsorption equilibrium of PCE in the pore solution indicated that the C-S-H/PCE seeds did not directly introduce new crystal nucleation sites but exposed new C-S-H surfaces through the desorption of PCE on the surface of C-S-H/PCE seeds. The desorption degree of PCE on the surface of C-S-H/PCE seeds determined the promoting effect of C-S-H/PCE seeds on cement hydration.
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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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