Recently, the widespread use of high‑potassium limestone has led to a sharp increase in the K2O content in clinker, resulting in high‑potassium cement clinker. When mixed with water, high‑potassium cement clinker releases a significant amount of K+ ions in a short period, adversely affecting the performance of cement. Changes in the silica modulus can modify the proportion of silicate minerals and flux minerals that act as carriers of K+ ions, which in turn affects the solidification and the hydration rate of K+ ions. This study aims to investigate the influence of varying silica modulus in high‑potassium clinkers on the solid solution and hydration release rate of K+ ions and its influences on the mineral composition and hydration performance of high‑potassium clinkers. The results indicate that an increase in silica modulus leads to a decrease in the solid solubility of K+ ions in clinkers, resulting in a reduction in the ratio of C2S-α′L/C2S-β and the ratio of C3A-o/C3A-c. Additionally, an increase in the silica modulus delays the sulfate depletion peak, retards the release of K+ ions, inhibits the transformation of AFt to Ms, and ultimately increases the compressive strength at 28 days.

中文翻译：

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不同二氧化硅模量下高钾水泥熟料中 K+ 离子的固化和水化释放行为研究


近年来，高钾石灰石的广泛使用导致熟料中 K2O 含量急剧增加，导致高钾水泥熟料。当与水混合时，高钾水泥熟料会在短时间内释放出大量的 K+ 离子，对水泥的性能产生不利影响。二氧化硅模量的变化可以改变作为 K+ 离子载体的硅酸盐矿物和熔剂矿物的比例，进而影响 K+ 离子的凝固和水合速率。本研究旨在探讨高钾熟料中二氧化硅模量变化对 K+ 离子固溶体和水合释放速率的影响，及其对高钾熟料矿物组成和水化性能的影响。结果表明，二氧化硅模量的增加导致 K+ 离子在熟料中的固溶度降低，导致 C2S-α′L/C2S-β 的比值和 C3A-o/C3A-c 的比值降低。此外，二氧化硅模量的增加会延迟硫酸盐消耗峰，延缓 K+ 离子的释放，抑制 AFt 向 Ms的转变，并最终增加 28 天时的抗压强度。