科研之友
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摘要
In the mining of natural limestone, the phenomenon of calcium-magnesium accompaniment is very common. According to our previous study, Mg2+ can enter the crystal lattice of calcium silicate hydrates. In this study, the mineralogy of a CaO-MgO-SiO2-H2O system was characterized and the micro-mechanical properties were evaluated using nano-indentations to clarify the effect of magnesium on the mechanical properties of quartz sand-lime autoclaved products. The results showed that magnesium facilitated the formation of C-S-H with lower alkalinity and accelerated the transformation of C-S-H (I) into tobermorite, thereby improving its crystallinity. Petal-like Mg-tobermorite was generated from the original flaky tobermorite, and the amount of binding Mgtobermorite reached 2.5% under an autoclaved temperature of 180 degrees C. Furthermore, the content of ultrahigh-density C-S-H increased when 5% magnesium was added to the system.
