Hydration of MgO/SiO2 and Portland cement mixtures: A structural investigation of the hydrated phases by means of X-ray diffraction and solid state NMR spectroscopy

作者：Martini Francesca; Tonelli Monica; Geppi Marco; Ridi Francesca^*; Borsacchi Silvia^*; Calucci Lucia

来源：Cement and Concrete Research, 2017, 102: 60-67.

DOI：10.1016/j.cemconres.2017.08.029

• Magnesium silicate hydrate (M-S-H)
• Calcium silicate hydrate (C-S-H) (B)
• MgO (D)
• Portland cement (D)
• Solid state NMR
• X-ray diffraction (B)

The phases formed during the hydration of several MgO/SiO2 and Portland cement mixtures were investigated by performing X-ray diffraction and Si-29 and Al-27 solid state NMR experiments on samples hydrated for 1, 7 and 28 days. The structural properties and relative amount of magnesium silicate hydrate (M-S-H) and calcium silicate hydrate (C-S-H) gels, which form as separate phases, were found to significantly depend on the initial composition of the mixtures. Faster hydration kinetics was observed for all mixtures with respect to the "pure" MgO/SiO2 and Portland cement samples, pH and excess of silica playing a major role. Moreover, the addition of the MgO/SiO2 mixture to Portland cement affects the formation of aluminum-containing hydrated phases.

• 出版日期2017-12