The effect of micelles with random pH-sensitive/hydrophobic structure on the workability, hydration process and microstructure of cement paste
The effect of micelles with random pH-sensitive/hydrophobic structure on the workability, hydration process and microstructure of cement paste
复制标题
随机pH敏感/疏水结构胶束对水泥浆体和易性、水化过程及微观结构的影响
DOI：
10.1039/c6ra26643f
复制
发表时间：
2017-03
期刊：
影响因子：
3.9
通讯作者：
Yu Q. J.
中科院分区：
文献类型：
--
作者：
Zhu Y. Y.;Hu J.;Ma Y. W.;Xie H. B.;Guo W. H.;Wei J. X.;Yu Q. J.
在这项研究中，工作性，两种具有随机pH敏感/疏水结构的嵌段共聚物胶束对水泥浆体水化速率和微观结构的影响（聚（聚乳酸甲基丙烯酸酯-co-甲基丙烯酸叔丁酯）-b-聚（聚乙二醇甲基醚甲基丙烯酸酯）分别研究了P（PLAMA-co-tBMA）-b-PPEGMA和聚乙二醇甲醚-b-（聚乳酸-co-聚（β-氨基酯））（MPEG-b-（PLA-co-PAE））共聚物。在新拌水泥浆体中，胶束被有效地吸附在水泥颗粒上，虽然由于胶束浓度较低，对水泥颗粒的平均zeta电位影响不大，但在高水灰比下，吸附的胶束改变了部分水泥颗粒的zeta电位，从而改善了水泥浆体的和易性。在硬化水泥浆体中，胶束在水化早期延缓了C3 S的水化速率，但在后期加快了水泥浆体的水化速率，使水泥基体致密，力学性能提高。最合理的机理与聚合物胶束的成核效应、分子结构和吸附性能有关。
In this study, the workability, hydration rate and microstructure of cement paste in the presence of the micelles prepared by two different diblock copolymers with random pH sensitive/hydrophobic structure (poly(polylactide methacrylate-co-tert-butyl methacrylate)-b-poly(poly(ethylene glycol) methyl ether methacrylate) (P(PLAMA-co-tBMA)-b-PPEGMA) and poly(ethylene glycol) methyl ether-b-(poly-lactic acid-co-poly(β-amino esters)) (MPEG-b-(PLA-co-PAE)) copolymers, respectively) were investigated. In fresh cement paste, the micelles were efficiently adsorbed on cement particles; although the average zeta potential of cement particles was not significantly changed in the presence of the micelles due to their low concentrations, with a high water to cement ratio, the adsorbed micelles altered the zeta potential of partial cement particles, leading to a better workability of cement paste. In hardened cement paste, the micelles retarded the hydration rate of C3S at very early hydration age, but accelerated the hydration rate of cement paste at later stages, resulting in a denser cement matrix and increased mechanical property. The most plausible mechanisms are related to the nucleation effect, molecular structure and adsorption performance of the polymeric micelles.
登录
查看更多内容
影响因子：
2.7
作者：
Xiongyi Peng;Xia Li;Dong-Dong Chen-Dong;Deyun Ma
通讯作者：
Xiongyi Peng;Xia Li;Dong-Dong Chen-Dong;Deyun Ma
影响因子：
--
作者：
Washburn, EW
通讯作者：
Washburn, EW
影响因子：
56.9
作者：
Savic, R;Luo, LB;Maysinger, D
通讯作者：
Maysinger, D
影响因子：
16.6
作者：
Fernández-Carneado, J;Kogan, MJ;Giralt, E
通讯作者：
Giralt, E
影响因子：
3.9
作者：
C. Zhang;Wensheng Wu;Na Yao;Bin Zhao;Lijuan Zhang
通讯作者：
C. Zhang;Wensheng Wu;Na Yao;Bin Zhao;Lijuan Zhang