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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Thermal evolution of metakaolin geopolymers: Part 1 - Physical evolution
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Thermal evolution of metakaolin geopolymers: Part 1 - Physical evolution

机译：偏高岭土地质聚合物的热演化：第1部分-物理演化

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摘要

The physical evolution of materials during heating is a critical factor in determining their suitability and performance for applications ranging from construction to refractories and adhesives. The effect of different cations (sodium and potassium) on the physical evolution of geopolymeric materials derived from metakaolin is investigated for a range of specimens with Si/Al ratios between 1.15 and 2.15. It is observed that the effect of potassium is to reduce the thermal shrinkage, while thermal shrinkage increases with increasing Si/Al ratio in the presence of each alkali type. The thermal shrinkage behavior of mixed-alkali specimens is observed to change from a mean of the sodium and potassium specimens at low Si/Al ratio to behave similarly to sodium specimens at high Si/Al ratios. It is clear from this investigation that alkali cations only have a significant effect on thermal shrinkage of geopolymer at low Si/Al ratios (<= 1.65), while both Si/Al ratio and alkali cation have little effect on the extent of thermal shrinkage at Si/Al >= 1.65. (c) 2006 Elsevier B.V. All rights reserved.
机译：材料在加热过程中的物理演变是决定其适用性和性能（从建筑到耐火材料和粘合剂）的关键因素。对于一系列硅/铝比为1.15和2.15的样品，研究了不同阳离子（钠和钾）对偏高岭土衍生的地聚合物材料物理演化的影响。观察到钾的作用是减少热收缩，而在每种碱类型的存在下，热收缩随着Si / Al比的增加而增加。观察到混合碱金属试样的热收缩行为从低Si / Al比率的钠和钾试样的平均值变化为与高Si / Al比率的钠试样相似。从这项研究中可以明显看出，在低Si / Al比（<= 1.65）下，碱金属阳离子仅对地质聚合物的热收缩有显着影响，而Si / Al比和碱金属阳离子对地聚合物的热收缩程度几乎没有影响。 Si /Al≥1.65。 （c）2006 Elsevier B.V.保留所有权利。

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