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首页> 外文期刊>Journal of Ceramic Processing Research. (Text in English) >Investigation of natural crack healing phenomena on historical masonry mortars
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Investigation of natural crack healing phenomena on historical masonry mortars

机译：历史砌筑砂浆天然裂缝愈合现象的研究

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摘要

Cementitious materials have been often observed for many years to have a natural crack healing capability due in part to the re-hydration of previously unhydrated cement within the matrix upon re-submersion in water. However, the natural phenomena such a crack self-healing is very limited, because self-healing capability of crack depends on various environmental conditions. This study aims to clarify the natural healing phenomena of crack in cementitious materials and develop crack self-healing cementitious materials based on the natural healing mechanisms. In this research, secondary phases of newly-formed products in historical masonry mortars were investigated in old bridges in the Netherlands. Moreover, in order to understand the precipitation conditions of calcium salts in the cracks, morphology, the shape and size of re-hydration products in the old mortar and brick, microscopy and SEM (EDS) analysis were also conducted. From these results, modified C-A-S-H phases as well as the formation of calcite were found, which increase the self-healing capability of old masonry mortar by both dissolution and chemical weathering effects of K-feldspar minerals in cracks or pores.
机译：多年来，人们经常观察到胶凝材料具有天然的裂缝愈合能力，这部分是由于重新浸没在水中后基质中先前未水合的水泥重新水化所致。但是，由于裂纹的自愈能力取决于各种环境条件，因此这种裂纹自愈的自然现象非常有限。本研究旨在弄清胶结材料中裂缝的自然愈合现象，并基于天然修复机理开发裂缝自修复胶结材料。在这项研究中，对荷兰历史悠久的砖石砂浆中新形成的产品的第二相进行了研究。此外，为了了解钙盐在裂缝中的沉淀条件，还对旧砂浆和砖中的水合产物的形态，形态和大小进行了显微镜和SEM（EDS）分析。从这些结果中，发现了改性的C-A-S-H相以及方解石的形成，它们通过裂缝或孔隙中钾长石矿物的溶解和化学风化作用增强了旧砌筑砂浆的自愈能力。

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