GAO Nanxiao (1984-), female, Master, Senior Engineer. E-mail: gaonanxiao@cnjsjk.cn
A series of cationic sacrificial agents (CSA) were synthesized via free radical copolymerization of unsaturated quaternary ammonium salt monomer and unsaturated nonionic (anion) monomer. The effect of sacrificial agent on the dispersion of polycarboxylate superplasticizer in cement mixed with montmorillonite (MMT) was evaluated via the fluidity of cement paste. Also, the effects of monomer polymerization ratio, quaternary ammonium salt monomer type and nonionic (anionic) monomer type on the action effect of the sacrificial agent were investigated by organic carbon analysis, thermogravimetry, X-ray diffraction, and scanning electron microscopy. Trimethyl allyl ammonium bromide-acrylamide (ATMA-AM 2∶1) was determined as an optimum structure, and its action mechanism was also analyzed. The fluidity of PCE in cement paste mixed with MMT increases from 156 mm to 225 mm at 1.0% of ATMA-AM (2∶1). The adsorption capacity of PCE on MMT and the holes on the surface of MMT all reduce, thus effectively preventing the polyether side chain of PCE molecule from entering the interlayer of MMT and enhancing MMT effect on the dispersion property of PCE.
| 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 |