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首页> 外文期刊>Journal of Materials Science >Physical evolution of Na-geopolymer derived from metakaolin up to 1000 degrees C
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Physical evolution of Na-geopolymer derived from metakaolin up to 1000 degrees C

机译:偏高岭土衍生的Na-地聚合物的物理演化温度高达1000摄氏度

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摘要

The thermal shrinkage and weight loss of a systematic series of geopolymers with nominal composition of NaAlO2(SiO2) (z) center dot 5.5H(2)O (1.15 <= z <= 2.15) made by activation of metakaolin with sodium silicate solutions are presented. The thermal behaviour of Na-geopolymers are varied, but may be categorised into four regions of behaviour exhibited by all specimens. This investigation explores the effect of nominal Si/Al on the processes and mechanisms of thermal shrinkage and weight loss throughout constant heating of Na-geopolymer. The overall thermal shrinkage of Na-geopolymer increases with increasing nominal Si/Al, with the onset temperature of structural densification occurring at lower temperature with increasing Si/Al. Thermal shrinkage is observed to result from capillary strain, dehydroxylation and viscous sintering in different temperature regions, and is explored by use of dilatometry, thermogravimetry, nitrogen porosimetry and use of different constant heating rates.
机译:通过使用硅酸钠溶液活化偏高岭土制得的一系列系统化的地质聚合物的热收缩率和重量损失,这些地质聚合物的标称组成为NaAlO2(SiO2)(z)中心点5.5H(2)O(1.15 <= z <= 2.15)呈现。 Na-地聚合物的热行为是变化的,但是可以分为所有样品表现出的四个行为区域。这项研究探索了在持续加热Na-地质聚合物过程中名义Si / Al对热收缩和失重过程和机理的影响。 Na-地聚合物的总热收缩率随标称Si / Al的增加而增加,结构致密化的起始温度随Si / Al的增加在较低的温度下发生。观察到热收缩是由在不同温度区域的毛细应变,脱羟基作用和粘性烧结引起的,并且通过使用膨胀计,热重法,氮气孔隙率法和使用不同的恒定加热速率来探索热收缩。

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