A novel chemically bonded phosphate ceramics derived from metakaolin and monocalcium phosphate monohydrate for restoration of stone relics

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2025-06-04 DOI:10.1016/j.clay.2025.107880

Shu Jiang , Jinhua Wang , Jiaqi Chen , Xiaotong Huo , Yongkang Cao

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引用次数: 0

Abstract

Choosing proper cementitious material for the restoration of stone relics with high strength is challenging. In this study, a novel chemically bonded phosphate ceramics (CBPCs) was prepared based on acid-base reaction adopting metakaolin (MK) and monocalcium phosphate monohydrate (Ca(H₂PO₄)₂·H₂O, MCPM). The reaction products mainly consist of brushite (CaHPO₄·2H₂O) and phosphorus‑aluminum silicate gel phase. In which, the appropriate amount of brushite can fill the gap in the gel phase, favoring more densified microstructure and higher mechanical performance. Notably, the activated alumina in metakaolin is the key reaction component, and the P/Al molar ratios affect the compositions and properties. Besides, the physicochemical properties of the product are comparable to stone matrix. Further, the concentration of the undesirable soluble salt ions is less than 7 % of ordinary Portland cement, which can effectively avoid salt damage and guarantee the applicational safety of the stone relics.

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一种由偏高岭土和一水磷酸钙合成的新型化学键合磷酸盐陶瓷，用于石质文物修复

为高强度石质文物的修复选择合适的胶凝材料是一个挑战。本研究以偏高岭土（MK）和一水磷酸一钙（Ca(H2PO4)2·H2O， MCPM）为原料，通过酸碱反应制备了新型化学键合磷酸盐陶瓷（CBPCs）。反应产物主要由刷石（CaHPO4·2H2O）和磷铝硅酸盐凝胶相组成。其中，适量的刷石可以填补凝胶相的空白，有利于更致密的微观结构和更高的力学性能。偏高岭土中的活性氧化铝是反应的关键组分，P/Al摩尔比影响反应的组成和性能。此外，该产品的物理化学性质可与石材基质相媲美。此外，不良可溶性盐离子浓度小于普通硅酸盐水泥的7%，可有效避免盐损伤，保证石质文物的使用安全。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...