Preparation, characterization, and determination of mechanical and thermal stability of natural zeolite-based foamed geopolymers
Preparation, characterization, and determination of mechanical and thermal stability of natural zeolite-based foamed geopolymers
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DOI：
10.1016/j.conbuildmat.2018.03.253
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发表时间：
2018-05
影响因子：
7.4
通讯作者：
J. L. Lynch;H. Baykara;M. Cornejo;Guillermo Soriano;Nestor Ulloa
中科院分区：
文献类型：
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作者：
J. L. Lynch;H. Baykara;M. Cornejo;Guillermo Soriano;Nestor Ulloa
本研究是第一次尝试评估两种发泡剂，铝粉和过氧化氢（30 wt%水溶液）对沸石基地聚合物的影响，以及根据厄瓜多尔技术标准将其用作建筑材料的可能性。以厄瓜多尔天然沸石凝灰岩为原料，分别用NaOH（10 M）、Ca(OH)2和Na4Si5O12进行碱活化，并使用两种不同的发泡剂制备了这些泡沫地聚合物。以铝粉为例，试验范围为0.05 ~ 0.25 wt%；另一方面，过氧化氢的含量为0.5 ~ 4.0%。采用定量x射线衍射（QXRD）、热重（TGA）、傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）等技术对泡沫地聚合物样品进行表征。两种发泡剂在沸石基地聚合物中的应用结果均符合厄瓜多尔技术标准NTE INEN 643和NTE INEN 638；而以铝粉为发泡剂的发泡材料孔径分布较好，性能较好。在此基础上，泡沫地聚合物是一种适合用于住宅砌筑墙体的建筑材料。
This study is the first attempt to evaluate the effect of two foaming agents, aluminum powder and hydrogen peroxide (30 wt% water solution) on zeolite-based geopolymers and their possible use as building material according to Ecuadorian technical standards. These foamed geopolymers were prepared by alkali activation of an Ecuadorian natural zeolitic tuff and by alkali activation using NaOH (10 M), Ca(OH)2and Na4Si5O12, with the use of two different foaming agents mentioned. In the case of aluminum powder, the experimental range was between 0.05 and 0.25 wt%; on the other hand, the percentages of hydrogen peroxide ranged from 0.5 to 4.0%. For characterization of the foamed geopolymer samples, quantitative X-ray diffraction (QXRD), thermogravimetric (TGA), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) techniques were used. The results of both foaming agents in zeolite-based geopolymers met Ecuadorian technical standards NTE INEN 643 and NTE INEN 638; nevertheless, the use of aluminum powder as foaming agent exhibited a better pore size distribution, suggesting a better performance. On the basis of these results, foamed geopolymers are suitable construction materials for the application of manufactured for masonry wall in houses.