Improvement in fluidity loss of magnesia phosphate cement by incorporating polycarboxylate superplasticizer
Improvement in fluidity loss of magnesia phosphate cement by incorporating polycarboxylate superplasticizer
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添加聚羧酸高效减水剂改善磷酸镁水泥的流动性损失
DOI：
10.1016/j.conbuildmat.2017.12.214
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发表时间：
2018-03
影响因子：
7.4
通讯作者：
Xiaohai Liu
中科院分区：
文献类型：
--
作者：
Hongbo Tan;Xun Zhang;Yulin Guo;Baoguo Ma;Shouwei Jian;Xingyang He;Zhenzhen Zhi;Xiaohai Liu
研究了聚羧酸减水剂（PCE）对磷酸镁水泥（MPC）浆体流动性的影响。用微坍落度评价流动性和流动性损失。通过凝结时间、水化热、X射线衍射（XRD）、扫描电镜（SEM）和电导率等测试手段分析了PCE存在下MPC的水化过程。采用总有机碳分析仪、电感耦合等离子体发射光谱仪和X射线光电子能谱仪研究了四氯乙烯和三氯乙烯在氧化镁悬浮液中的吸附行为。结果表明，PCE对MPC糊的增塑作用不大，但能明显提高MPC糊的30 min流动度。PCE分散效果不佳的原因是MPC中的MgO不仅会阻碍PCE的吸附，而且会使PCE吸附在MgO颗粒表面。固化时间、水化热、XRD和SEM分析结果表明，PCE对MPC水化有一定的延缓作用，从而改善了MPC的30 min流动度。其主要原因是PCE能增强镁基硼酸盐层的稳定性，并通过吸附作用阻碍鸟粪石的形成和生长。研究结果可为MPC新型缓凝剂的设计提供指导，也为实际工程中MPC浆体流动性的控制提供有益的经验。
Effect of polycarboxylate superplasticizer (PCE) on fluidity of magnesia phosphate cement (MPC) paste was investigated. The fluidity and fluidity loss were assessed with mini slump. Hydration process of MPC in the presence of PCE was analyzed with setting time, hydration heat, X-ray diffraction (XRD), scanning electron microscope (SEM), and conductivity. Adsorption behavior of PCE and borax in MgO suspension was studied with total organic carbon analyzer, inductive coupled plasma emission spectrometer, and X-ray photoelectron spectroscopy. The results show that PCE has almost no effect on plasticizing MPC paste, but can obviously increase the 30 min fluidity. The ineffectiveness of dispersion of PCE is because borax in MPC can significantly obstruct adsorption of PCE as well as invalid PCE adsorbed on the surface of MgO particles. The improvement in 30 min fluidity is due to the retarding effect of PCE on hydration of MPC, which can be illustrated from the results of setting time, hydration heat, XRD and SEM. The main reason for retardation is because PCE can enhance the stability of magnesium-based borate layer and can also hinder the formation and growth of struvite by adsorption. Such results would be expected to provide guidance on the design of new type of retarder for MPC and also offer useful experience for controlling the fluidity of MPC paste over time in practical engineering.
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DOI：
10.1007/s11595-014-0917-4
发表时间：
2014-04
影响因子：
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