Effect of aluminum dihydrogen phosphate in enhancing mechanical properties and water resistance of magnesium phosphate cement

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-02-24 DOI:10.1016/j.cemconres.2025.107849

Xingyu Gan , Haiming Zhang , Zeyu Lu , Kai Ma , Xiaowen Chen , Lingchao Lu , Laibo Li

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引用次数: 0

Abstract

Incorporating aluminum dihydrogen phosphate into magnesium phosphate cement (MPC), including magnesium ammonium phosphate cement (AMAPC) and magnesium potassium phosphate cement (AMKPC), significantly enhances both compressive strength and water resistance. The results show that AMAPC-3 exhibited a remarkable increase in compressive strength, maintaining a compressive strength retention ratio of 0.83 after 60 days. The addition of aluminum dihydrogen phosphate introduced extra phosphate ions that facilitated the hydration of unreacted MgO, resulting in an increased formation of hydration products such as struvite and k-struvite. Furthermore, it participated in independent hydration reactions, generating new phase Al(OH)₃ gel and Al(PO₄)·2H₂O gel, which contributed to a denser microstructure. Microstructural analysis confirmed a refined pore structure and reduced porosity in the modified cements. These findings position aluminum dihydrogen phosphate as an effective modifier for enhancing the water resistance and mechanical properties of MPCs.

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在磷酸镁铵水泥（AMAPC）和磷酸镁钾水泥（AMKPC）等磷酸镁水泥（MPC）中掺入磷酸二氢铝可显著提高抗压强度和耐水性。结果表明，AMAPC-3 的抗压强度显著提高，60 天后的抗压强度保持率为 0.83。磷酸二氢铝的添加引入了额外的磷酸根离子，促进了未反应氧化镁的水化，从而增加了水化产物（如硬石膏和 k-硬石膏）的形成。此外，它还参与了独立的水化反应，生成了新相 Al(OH)3 凝胶和 Al(PO4)-2H2O 凝胶，从而使微观结构更加致密。微观结构分析证实，改性水泥中的孔隙结构更加细化，孔隙率降低。这些研究结果表明，磷酸二氢铝是一种有效的改性剂，可提高 MPC 的耐水性和机械性能。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.