Abstract This work reports the evolution of the phase assemblage, pore solution, porosity, and mechanical resistance of Belite-Ye'elimite-Ferrite (BYF) cement pastes. Different water-to-cement (w/c) ratios were considered and the addition of fly ash (FA) evaluated. The initial 1-day hydration of BYF cement paste was characterized by the ye'elimite hydration accompanied by a pronounced alkalinity increase controlled mainly by the molar ratio of calcium sulfate to ye'elimite. Throughout the 1-year test, the phase assemblages of 0.50 and 0.67 w/c samples were similar, composed of ettringite, AFm, stratlingite, silicious hydrogarnet, and C-S-H. The hydration of the 0.40 w/c cement paste was almost complete within a month. Additions of 25 wt% FA increased the fraction of stratlingite and ettringite without long-term strength losses compared to plain BYF cement paste with the same water-to-binder ratio. Results from different characterization techniques for both liquid and solid phases at early-age (first 24 h) were complemented by thermodynamic calculations.

中文翻译：

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Belite-Ye'elimite-Ferrite (BYF) 水泥浆的水化作用：水灰比和粉煤灰存在的影响

摘要 这项工作报告了 Belite-Ye'elimite-Ferrite (BYF) 水泥浆的相组合、孔隙溶液、孔隙率和机械阻力的演变。考虑了不同的水与水泥 (w/c) 比并评估了粉煤灰 (FA) 的添加。BYF 水泥浆最初 1 天水化的特点是 ye'elimite 水化伴随着显着的碱度增加，主要由硫酸钙与 ye'elimite 的摩尔比控制。在整个 1 年的测试中，0.50 和 0.67 w/c 样品的相组合相似，由钙矾石、AFm、Stratlingite、硅质水石榴石和 CSH 组成。0.40 w/c 水泥浆的水化在一个月内几乎完成。与具有相同水胶比的普通 BYF 水泥浆相比，添加 25 wt% FA 增加了Stratlingite 和钙矾石的比例，而不会造成长期强度损失。热力学计算补充了早期（最初 24 小时）液相和固相的不同表征技术的结果。