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Green reaction-type nucleation seed accelerator prepared from coal fly ash ground in water environment
Construction and Building Materials ( IF 7.4 ) Pub Date : 2021-09-17 , DOI: 10.1016/j.conbuildmat.2021.124840
Jin Yang 1, 2 , Mingjian Yang 1 , Xingyang He 1, 2 , Mengyang Ma 3 , Mengtian Fan 1 , Ying Su 1, 2 , Hongbo Tan 4
Affiliation  

Fly ash is the main waste generated from coal production. The application of fly ash in building materials helps reduce pollution. In the present work, a novel reaction-type nucleation seed accelerator with D50 of 512 nm was prepared from coal fly ash using wet-grinding technology, denoted as WFA seed. The physical and chemical performances of WFA seed and its promotion effect on hydration, strength and microstructure of Portland cement (PC) were studied. With the addition of WFA seed, compressive strength was significantly increased by 50% and 16% at 12 h and 28 days. The hydration heat peak was also clearly increased by WFA seed. The hydration and strength promotion by WFA seed is attributed to the dual function of secondary reaction (which occurs as early as 12 h) and nucleation induction, which is different from the single function of nucleation site effect of some existing nano-materials. Furthermore, the main chain length and Al/Si ratio of C-S-H gel were increased, and the pore structure of cement was refined by the addition of WFA seed.



中文翻译:

水环境粉煤灰制备绿色反应型成核种子促进剂

粉煤灰是煤炭生产过程中产生的主要废弃物。粉煤灰在建筑材料中的应用有助于减少污染。在目前的工作中,一种具有 D 50的新型反应型成核种子加速器使用湿法研磨技术从粉煤灰制备 512 nm 的粒子,表示为 WFA 种子。研究了WFA种子的理化性能及其对硅酸盐水泥(PC)水化、强度和微观结构的促进作用。添加 WFA 种子后,抗压强度在 12 小时和 28 天时分别提高了 50% 和 16%。WFA 种子也明显增加了水合热峰。WFA种子的水化和强度提升归因于二次反应(最早发生在12小时)和成核诱导的双重作用,这与现有一些纳米材料的成核位点效应的单一作用不同。此外,WFA种子的加入增加了CSH凝胶的主链长度和Al/Si比,细化了水泥的孔隙结构。

更新日期:2021-09-17
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