Effect of Sodium Sulfate and C–S–H Seeds on the Reaction of Fly Ash with Different Amorphous Alumina Contents,ACS Sustainable Chemistry & Engineering

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Effect of Sodium Sulfate and C–S–H Seeds on the Reaction of Fly Ash with Different Amorphous Alumina Contents
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-15 , DOI: 10.1021/acssuschemeng.9b06779
Fubing Zou _{1,

2} , Kunjie Shen _{1,

2} , Chuanlin Hu ₁ , Fazhou Wang _{1,

2} , Lu Yang ₁ , Shuguang Hu _{1,

2}

Affiliation

Fly ash (FA) is one of the largest industrial wastes in the world, and its storage is still accumulating. To meet this challenge, one of the most effective and promising ways is to increase the dosage of fly ash in cement-based materials. However, the slow reaction of FA restricts the high content substitution of cement by FA. Therefore, a better knowledge for enhancing the reaction of FA is essential toward achieving a green and sustainable cementitious binder. Previous research demonstrated the synergistic effect on enhancing the reaction of FA with the combined application of sodium sulfate (SS) and calcium–silicate–hydrates (C–S–H) seeds, while the mechanism of the synergistic effect is unclear. In this study, the effect of SS and C–S–H seeds on the reaction of FA with different amorphous alumina contents is systematically investigated. The results show that the effect of SS and C–S–H seeds on the reaction of FA is closely related to the amorphous alumina content and the reaction time. Moreover, the underlying mechanism is revealed and may provide guidance for the massive utilization of FA and other Al-rich mineral admixtures.

中文翻译：

硫酸钠和C–H–H种子对不同非晶态氧化铝含量的粉煤灰反应的影响

粉煤灰（FA）是世界上最大的工业废物之一，其储存仍在积累中。为了应对这一挑战，最有效和最有前途的方法之一是增加水泥基材料中粉煤灰的用量。然而，FA的缓慢反应限制了FA对水泥的高含量替代。因此，对增强FA反应的更好了解对于实现绿色和可持续的胶结粘结剂至关重要。先前的研究表明，结合使用硫酸钠（SS）和水合硅酸钙（C–S–H）种子可增强FA反应的协同作用，但协同作用的机理尚不清楚。在这项研究中，系统地研究了SS和C–S–H种子对FA与不同非晶态氧化铝含量的反应的影响。结果表明，SS和C–S–H种子对FA反应的影响与无定形氧化铝含量和反应时间密切相关。此外，揭示了其潜在机理，并可能为大量利用FA和其他富含Al的矿物掺合料提供指导。

更新日期：2020-01-15

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