Recently, the widespread use of high‑potassium limestone has led to a sharp increase in the KO 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 CS-α′/CS-β and the ratio of CA-o/CA-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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不同硅模量下高钾水泥熟料凝固及水化释放行为研究


近年来，高钾石灰石的广泛使用导致熟料中KO含量急剧增加，从而产生了高钾水泥熟料。当高钾水泥熟料与水混合时，会在短时间内释放大量钾离子，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离子的凝固和水化速率。本研究旨在探讨高钾熟料中不同硅模量对钾离子固溶和水化释放速率的影响，以及对高钾熟料矿物成分和水化性能的影响。结果表明，二氧化硅模量的增加导致熟料中K离子固溶度降低，导致CS-α′/CS-β比值和CA-o/CA-c比值降低。此外，二氧化硅模量的增加延迟了硫酸盐消耗峰，延迟了K离子的释放，抑制了AFt向Ms的转变，并最终增加了28天时的抗压强度。