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Surface whitening mechanism of ettringite rich decorative mortar
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2025-01-16 , DOI: 10.1016/j.cemconres.2025.107786
Xianping Liu, Hanqing Gao, Hervé Fryda, Peiming Wang
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2025-01-16 , DOI: 10.1016/j.cemconres.2025.107786
Xianping Liu, Hanqing Gao, Hervé Fryda, Peiming Wang
This study investigates the surface whitening mechanism of ettringite rich decorative mortars. Surface whitening was triggered through an exaggerated test scenario with a highly porous simplified mortar and a series of wet/dry cycles. Based on correlative light-electron microscopy observation, soak solution and mineralogical composition analyses, a mechanism is proposed: surface whitening is due to large agglomerates (>100 μm) of further hydrates (AFt phase and AFm phase) being formed in the large pores of the mortar surface during the drying process. The degree of surface whitening does not follow a continuous increase over cycle numbers, but rather evolves to a maximum after which more cycles lead to reduced surface whitening. This surface clearing and reduced whitening is explained by the disappearance of the hydrate agglomerates caused by full carbonation of AFt phase and AFm phase, transforming to small crystals of CaCO3 and secondary Al(OH)3 , releasing the color of the pigments.
中文翻译:
一种富含钙矾石的装饰砂浆表面美白机理
本研究探讨了富含钙矾石的装饰砂浆的表面白化机理。表面白化是通过一个夸张的测试场景触发的,该场景具有高度多孔的简化砂浆和一系列湿/干循环。基于相关光电显微镜观察、浸泡溶液和矿物成分分析,提出了一种机制:表面白化是由于干燥过程中砂浆表面的大孔中形成大量水合物(AFt 相和 AFm 相)的进一步水合物(>100 μm)。表面白化的程度不是随着循环次数的持续增加而演变的,而是演变到最大值,之后更多的循环会导致表面白化减少。这种表面透明和减少的白化是由于 AFt 相和 AFm 相完全碳化引起的水合物团聚物消失,转化为 CaCO3 和仲级 Al(OH)3 的小晶体,释放颜料的颜色。
更新日期:2025-01-16
中文翻译:
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一种富含钙矾石的装饰砂浆表面美白机理
本研究探讨了富含钙矾石的装饰砂浆的表面白化机理。表面白化是通过一个夸张的测试场景触发的,该场景具有高度多孔的简化砂浆和一系列湿/干循环。基于相关光电显微镜观察、浸泡溶液和矿物成分分析,提出了一种机制:表面白化是由于干燥过程中砂浆表面的大孔中形成大量水合物(AFt 相和 AFm 相)的进一步水合物(>100 μm)。表面白化的程度不是随着循环次数的持续增加而演变的,而是演变到最大值,之后更多的循环会导致表面白化减少。这种表面透明和减少的白化是由于 AFt 相和 AFm 相完全碳化引起的水合物团聚物消失,转化为 CaCO3 和仲级 Al(OH)3 的小晶体,释放颜料的颜色。