Effect of magnesium on the C-S-H nanostructure evolution and aluminate phases transition in cement-slag blend

Effect of magnesium on the C-S-H nanostructure evolution and aluminate phases transition in cement-slag blend
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镁对水泥-矿渣掺混物中C-S-H纳米结构演化和铝酸盐相变的影响

DOI:
10.1007/s11595-018-1794-z
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发表时间:
2018-01
期刊:
Journal of Wuhan University of Technology (Materials Science)
影响因子:
--
通讯作者:
侯东帅
侯东帅
中科院分区:
其他
文献类型:
--
作者:
丁庆军;杨军;张高展;侯东帅

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利用29 Si、27 Al NMR谱和XRD技术对浸泡在不同浓度Mg(NO3)2溶液中的水泥和水泥-矿渣浆体的微观结构进行了研究。结果表明,与水养护相比,在Mg(NO3)2溶液中养护的水泥浆体和水泥-矿渣浆体的水化延迟。此外,Mg ~(2+)离子还对水泥和水泥-矿渣浆体中的C-A-S-H具有脱钙脱铝作用,降低了C-A-S-H中的Ca/Si和Al[4]/Si比值。与纯水泥浆体相比,矿渣水泥浆体中C-A-S-H的脱铝作用得到缓解。C-A-S-H凝胶中解聚的钙离子和铝离子主要进入孔溶液中,分别维持TAH中的pH值和形成Al[6]。另一方面,Mg 2+离子对Al[6]物种之间的内转变产生影响,从AFm和水石榴石到类水滑石相。NO3-离子在层状镁铝结构中间层化,形成硝化类水滑石相(Mg 1-xAlx(OH)2(NO3)x·nH 2 O)。27 Al NMR和XRD数据的结果表明,钙矾石似乎不与Mg 2+离子反应。
The microstructural study was conducted on cement and cement-slag pastes immersed in different concentrations of Mg(NO3)2 solutions utilizing 29Si, 27Al NMR spectroscopy and XRD techniques. The results show that the hydration of both the cement and cement-slag pastes is delayed when the pastes are cured in Mg(NO3)2 solutions as compared to the pastes cured in water. Moreover, Mg2+ ions also exhibit an decalcifying and dealuminizing effect on the C-A-S-H in cement and cement-slag pastes, and thereby decrease Ca/Si and Al[4]/Si ratios of the C-A-S-H. The dealuminization of C-A-S-H is mitigated for cement-slag paste as compared to pure cement paste. The depolymerized calcium and aluminum ions from C-A-S-H gel mainly enter the pore solution to maintain the pH value and form Al[6] in TAH, respectively. On the other hand, Mg2+ ions exert an impact on the intra-transition between Al[6] species, from AFm and hydrogarnet to hydrotalcite-like phase. NO3- ions are interstratified in the layered Mg-Al structure and formed nitrated hydrotalcite-like phase (Mg1-xAlx(OH)2(NO3)x•nH2O). Results from both 27Al NMR and XRD data show that ettringite seems not to react with Mg2+ ions.
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