PCE结构对硅酸三钙结构和形貌的影响

发布时间：2018-04-18 08:39

本文选题：X射线光电子能谱 + 扫描电子显微镜　；参考：《建筑材料学报》2016年06期

【摘要】：为了进一步了解减水剂与水泥矿物相的相互作用,分别采用X射线光电子能谱(XPS)和扫描电子显微镜(SEM)研究了聚醚型聚羧酸减水剂(PCE)结构对硅酸三钙(C_3S)水化产物表面电子状态和形貌的影响.结果表明:在吸附了PCE的样品中,C—H的C1s谱峰明显增强,并出现C—O的C1s谱峰,而Si2p谱峰明显减弱,PCE在C_3S表面的吸附膜厚度为0.94~1.40nm;由于Ca元素填充于PCE吸附膜中,导致C_3S表面的Ca2p谱峰强度变化较小;PCE结构对Si2p,Ca2p谱峰的化学位移影响显著,即PCE的羧酸根密度越大,样品的化学位移越明显;PCE结构不同,抑制C_3S水化的程度也不同,并且PCE还可阻止C_3S的水化产物相互黏结.
[Abstract]:In order to further understand the interaction between water reducer and cement mineral phase,The effects of the structure of polyether polycarboxylic acid superplasticizer (PCEE) on the surface electronic state and morphology of the hydration products of tricalcium silicate C3S were studied by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM).The results show that the C1s peak of C-H in the adsorbed PCE is obviously enhanced, and the C1s peak of C-O appears, while the Si2p peak weakens obviously. The thickness of the adsorbed film on C3s surface is 0.94nm2.Because Ca is filled in the PCE adsorption film,As a result, the intensity change of Ca2p peak on C _ 3s surface is smaller. The chemical shift of Si _ 2p _ 2O _ (Ca _ 2p) peak is significantly affected by the structure of the Ca2p peak. That is, the larger the carboxylic acid radical density of PCE, the more obvious the chemical shift of the sample is, and the different degree of inhibition of C _ 3s hydration.Moreover, PCE can also prevent the hydration products of C _ 3s from bonding to each other.
【作者单位】：华东理工大学体育新材料研发中心;上海三瑞高分子材料股份有限公司;上海建筑外加剂工程技术研究中心;
【基金】：上海建筑外加剂工程技术研究中心能力提升项目(15DZ2282500)
【分类号】：TU528.042.2

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