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The role of aluminium in alkali-activated bentonites

机译：铝在碱活化膨润土中的作用

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摘要

In the pursuit of new sources of alumino-silicates for alkaline cement manufacture, the present paper reports on the compositional and mineralogical assessment of the reactive potential of several types of bentonites. A number of factors affect strength development in these materials, in particular their potentially reactive silica and aluminium content. While bentonites normally have a high SiO_2 content, the amount of reactive Al_2O_3 present is not always sufficient for the purpose at hand. The present study consequently also explored the effect of adding aluminium correctors (commercial sodium aluminate and bauxite) to the mix. The findings showed that de-hydroxylated bentonite reacted with an alkaline activator, yielding materials with cementitious properties. The addition of 10 % sodium aluminate raised mechanical strength, which was unaffected by the inclusion of bauxite. The primary reaction product was consistently found to be a (N,C)-A-S-H gel, with zeolites as the secondary products.
机译：在寻求用于碱性水泥生产的铝硅酸盐的新来源时，本论文报道了几种类型的膨润土的反应势的组成和矿物学评估。许多因素影响这些材料的强度发展，特别是它们潜在的反应性二氧化硅和铝含量。尽管膨润土通常具有较高的SiO_2含量，但存在的反应性Al_2O_3的量并不总是足以满足当前的目的。因此，本研究还探讨了向混合物中添加铝校正剂（商业铝酸钠和铝土矿）的效果。研究结果表明，脱羟基膨润土与碱性活化剂反应，生成具有胶凝性能的材料。添加10％的铝酸钠提高了机械强度，不受铝土矿含量的影响。始终发现主要反应产物是（N，C）-A-S-H凝胶，沸石为次要产物。

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