醋酸锌作为磷酸镁钾水泥的缓凝剂

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-05-15 DOI:10.1016/j.cemconcomp.2025.106114

Biwan Xu , Frank Winnefeld , Barbara Lothenbach

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引用次数: 0

摘要

开发缓凝效率高的无毒缓凝剂是高性能磷酸镁钾水泥基材料可持续发展的关键。醋酸锌是一种很有前途的MKP水泥缓凝剂。在Mg/PO4摩尔比为8的情况下，研究了醋酸锌对MKP水泥性能和水化性能的影响。在相同用量下，醋酸锌的缓凝作用比硼砂强得多，但其流动性降低，干燥收缩率增大，强度增长缓慢。锌和醋酸离子的共同作用导致pH降低，k -鸟粪石的形成延迟。k -鸟粪石、无定形含镁（和/或锌）磷酸盐、含醋酸盐相和部分水镁石在硬化后期形成。锌离子被固定在水化膏体基质中，保证了醋酸锌作为缓凝剂在MKP水泥中的安全使用。

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Zinc acetate as a set retarder for magnesium potassium phosphate cements

The development of not-toxic retarders with a high retardation efficiency is crucial for a sustainable development of high-performance magnesium potassium phosphate (MKP) cement-based materials. Zinc acetate is such a promising new set retarder for MKP cements. The impact of zinc acetate on the properties and hydration of the MKP cements at a Mg/PO₄ molar ratio of 8 was investigated up to 5 years. Zinc acetate had a much stronger retardation effect than borax at the same dosage, but also decreased flowability, increased drying shrinkage and led to a slower strength gain. The combined effect of zinc and acetate ions led to a lowered pH and the delayed formation of K-struvite at very early hydration times. K-struvite, amorphous magnesium (and/or zinc)-containing phosphates, an acetate-containing phase and some brucite were formed in the hardened matrix at late ages. The zinc ions were immobilized in the hydrated paste matrix, ensuring the safe use of zinc acetate as a retarder for MKP cements.

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.