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Change from MOC reaction system to start to prepare nanoscale active silicon dioxide (L-RHA) crops by some low-temperature combustion, and magnesium oxychloride cement was modified. Studies have shown that, L-RHA to improve the magnesium oxychloride cement water resistance has a very significant role, it may be the strength of the MOC after flooding significantly increased, softening coefficient multiplied. Thus, from the phase structure oxychloride cement solves the problem of poor water resistance of magnesium.

Keywords: Nano-active silicon dioxide; magnesium oxychloride cement; softening coefficient; phase structure

MOC is the basic material of all magnesium products, which is a rigid gas cementitious materials. MOC has a normal temperature condensation fast, strong bond, light weight, high strength, easy molding process, not combustion, environmental protection and other advantages. MgO-MgCl2-H2O ternary system is the basic magnesium oxychloride cement, at room temperature to 100 degrees and an appropriate molar ratio, ternary system (MgO-MgCl2-H2O) reacts  phase [5Mg ( OH) 2 · MgCl2 · 8H2O] and 3 · 1 · 8 phase [3Mg (OH) 2 · MgCl2 · 8H2O] gel and crystallization, 5.1 and 1.8 with 3.1 3.8 phase is the strength of magnesium products The main sources.

A lot of practice and research showed that the main crystalline magnesium oxychloride cement hardened phase relative phase unstable in water, resulting in reduced strength magnesium oxychloride cement, surface brine back to the Pan-cream. Alone MOC basic ternary system (MgO-MgCl2-H2O) is unable to improve product water resistance problems. Adding an inorganic, organic modifiers While improving its water resistance has a role, but there are high costs, the effect is not very clear, we can not completely solve the low softening coefficient, brine back to the Pan-cream and other issues. Thus, magnesium oxychloride cement poor water resistance has become a fatal flaw.

Add to active silicon dioxide in oxychloride cement reaction system can be changed so as to generate a water-insoluble crystalline phase, which was confirmed in theory and practice. However, the quality of active silicon dioxide, the source is the biggest problem plagued producers.

After much research I test found ash from crop nanoscale active silicon dioxide, and a large number were studied. The results showed that low crop ash (L-RHA) to improve the magnesium oxychloride cement has a significant effect on water resistance, softening coefficient doubled.



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