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Assessment of mechanical and microstructural properties of geopolymers produced from metakaolin, silica fume, and red mud
International Journal of Applied Ceramic Technology ( IF 2.1 ) Pub Date : 2020-09-24 , DOI: 10.1111/ijac.13635
Beatryz Mendes 1 , Igor Klaus Andrade 1 , José Maria de Carvalho 1 , Leonardo Pedroti 1 , André de Oliveira Júnior 1
Affiliation  

Geopolymers have been studied as viable alternative to traditional Portland cement‐based products, given the use of industrial by‐products as raw materials. This work evaluated the mechanical and microstructural properties of geopolymeric mortars produced with sodium hydroxide solution, metakaolin, silica fume, and red mud. The mixtures were produced by means of dosages with different molar ratios and curing conditions. The raw materials were characterized by granulometry, chemical, mineralogical, and thermal analysis. The characterization of mortars was performed by scanning electron microscopy (SEM) and axial compressive strength tests. The precalcination at 850°C of the red mud was sufficient to make it more reactive and suitable for use in geopolymers. Noteworthy, the best mechanical strengths of metakaolin mortars for curing at 50°C, and with the lowest SiO2/Al2O3 ratios. In the mortars with incorporated red mud, there was a decrease of strength at thermal curing conditions and with the increase of residue content, whose microstructure indicates the formation of more pores in the geopolymer matrix. The thermal curing promoted the formation of sodalite crystals, and the significant presence of Na particles on the surface suggests that part of the added NaOH did not react with the precursors.

中文翻译:

评估由偏高岭土,硅粉和赤泥生产的地聚合物的机械和微观结构性质

考虑到以工业副产品为原料,地聚合物被认为是传统波特兰水泥基产品的可行替代品。这项工作评估了用氢氧化钠溶液,偏高岭土,硅粉和赤泥生产的地聚合物砂浆的机械和微观结构性能。通过具有不同摩尔比和固化条件的剂量生产混合物。通过粒度分析,化学,矿物学和热分析来表征原材料。砂浆的表征通过扫描电子显微镜(SEM)和轴向抗压强度测试进行。赤泥在850°C下的预煅烧足以使其更具反应性,适合用于地质聚合物中。值得注意的是,偏高岭土砂浆在50°C下固化的最佳机械强度,2 / Al 2 O 3的比率。在掺入赤泥的砂浆中,在热固化条件下强度降低,并且残余物含量增加,其微观结构表明在地质聚合物基质中形成了更多的孔。热固化促进了方钠石晶体的形成,并且表面上Na颗粒的显着存在表明部分添加的NaOH不与前体反应。
更新日期:2020-09-24
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