Characterization of the white deposit on the surface of cement mortars by correlative light-electron microscopy (CLEM)

CEMENT Pub Date : 2022-12-01 DOI:10.1016/j.cement.2022.100046

Xianping Liu , Peiming Wang , Hanqing Gao , Herve Fryda , Linling Cai

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引用次数: 2

Abstract

This study focuses on the characterization of white deposit occurring after wet/dry cycles on the surface of cement mortars presenting large amount of AFt phase. Correlative light-electron microscopy (CLEM) was confirmed to be a powerful method in characterizing and identifying microscopic visible white deposit that causes macroscopic visible surface whitening in those cement mortars. It was discovered that the white deposit formed after wet/dry cycles was caused by solids precipitated on the surface of cement mortars during hydration and/or on drying, and those solids were composed of CaCO₃, AFt, AFm or their solid solutions. Due to the resolution limit of the human eye, there is a threshold size 100 μm for the microscopic visible white deposit or its cluster to become macroscopic visible surface whitening. Partial covering of red pigments by the newly formed solids on the surface of the cement mortars further confirmed the relationship between the size and quantity of microscopic visible white deposit and macroscopic visible surface whitening.

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水泥砂浆表面白色沉积物的相关光电子显微镜(CLEM)表征

本研究重点研究了水泥砂浆表面出现大量AFt相的干湿循环后白色沉积物的特征。相关光电子显微镜(CLEM)是表征和鉴别水泥砂浆中引起宏观可见表面白化的微观可见白色沉积物的有效方法。发现干湿循环后形成的白色沉积物是水泥砂浆水化和/或干燥过程中沉淀在其表面的固体，这些固体由CaCO3、AFt、AFm或它们的固溶体组成。由于人眼的分辨率限制，微观可见的白色沉积或其簇变为宏观可见的表面白化存在100 μm的阈值。水泥砂浆表面新形成的固体部分覆盖了红色颜料，进一步证实了微观可见白色沉积物的大小和数量与宏观可见表面增白之间的关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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CEMENT

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