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Cleaner one-part geopolymer prepared by introducing fly ash sinking spherical beads: Properties and geopolymerization mechanism
Journal of Cleaner Production ( IF 11.1 ) Pub Date : 2019-02-13 , DOI: 10.1016/j.jclepro.2019.02.116
Shenglai Guo , Cong Ma , Guangcheng Long , Youjun Xie

One-part geopolymeric binders which are considered as cleaner non-Portland cementitious materials are prepared by first mixing the aluminosilicate materials with the solid alkaline activators before adding water, which makes the mixing method of the geopolymer being the same as Portland cement. In this paper, sinking spherical beads (SSB) is introduced into the raw materials containing fly ash (CFA) and ground granulated blast furnace slag (GGBS) to synthesize a ternary one-part geopolymer. A systematic investigation of the effect of SSB on the geopolymer pastes and mortars is performed through measuring the fluidity, final setting time, compressive strength and flexural strength. It is found that SSB can significantly improve the fluidity and mechanical properties of geopolymer due to its high reactive effect and remarkable morphological effect. The action mechanism of SSB for improving the performance of the geopolymer was also dissected. It is interesting to note that SSB has little influence on the initial heat flow and increases the cumulative heat relating to the strength development. The changes in the formation of C-A-SH and N-A-SH gels after the introduction of SSB are well captured by the XRD and EDX analysis. It clearly appears that the N-A-SH gel with the optimal Na/Si ratio of 0.5 can be generated by optimizing the rational proportion of raw materials and alkaline activators. This study not only demonstrates the superiority of SSB in synthesizing a ternary one-part geopolymer, but also develops a method to design the novel non-Portland cement only by using industrial wastes.



中文翻译:

引入粉煤灰沉降球形珠粒制备的清洁型单组分地质聚合物:性能和地质聚合机理

通过在添加水之前首先将铝硅酸盐材料与固体碱性活化剂混合来制备被认为是更清洁的非波特兰水泥质材料的单组分地质聚合物粘合剂,这使得地质聚合物的混合方法与波特兰水泥相同。本文将沉没的球形珠粒(SSB)引入到包含粉煤灰(CFA)和磨碎的高炉矿渣(GGBS)的原料中,以合成三元一件式地质聚合物。通过测量流动性,最终凝固时间,抗压强度和抗弯强度,对SSB对地质聚合物浆料和砂浆的影响进行了系统的研究。发现SSB由于其高反应活性和显着的形态学效果而可以显着改善地聚合物的流动性和机械性能。还探讨了SSB改善地质聚合物性能的作用机理。有趣的是,SSB对初始热流几乎没有影响,并且会增加与强度发展有关的累积热量。CAS形成的变化XRD和EDX分析可以很好地捕获SSB引入后的H和NAS H凝胶。显然,可以通过优化原材料和碱性活化剂的合理比例来生成具有最佳Na / Si比为0.5的NAS H凝胶。这项研究不仅证明了SSB在合成三元一元地质聚合物中的优越性,而且还开发了一种仅通过使用工业废物来设计新型非硅酸盐水泥的方法。

更新日期:2019-02-13
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