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Salt migration and capillary absorption characteristics of cement mortar partially immersed in NaCl solution by Bing Li; Qinglin Meng; Jean-Marc Tulliani; Roberto Giordano; Chuanrui Li; Jing Zhao; Peng Ren is a Engineering article available to read on EtoBox.

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Salt crystallization represents a major reason for the damage observed for porous building materials in humid coastal areas. Despite the several theories developed to explain the process, no unanimous opinion has been proposed for the mechanism underlying the damage. A better understanding of the migration, crystallization, and distribution of salts in porous building materials in the presence of water is thus warranted to improve the durability for cultural heritages and new buildings. This paper reports an experimental study of crystal distribution, micromorphology, chloride ion migration, pore structures, and capillary absorption behaviors of cement-mortar specimens (side-coated and side-uncoated) at three different water-cement ratios (0.4, 0.6, and 0.8) after 120-day partial immersion in 5 wt% NaCl solution. Results showed that the different pore characteristics and side-coating treatment of the specimens governed not only capillary absorption, but also salt migration and distribution. The specimens with a large average pore diameter and greater porosity yielded more external salt crystals, while those with a small average pore diameter and dense surfaces demonstrated the reve

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Author

Bing Li; Qinglin Meng; Jean-Marc Tulliani; Roberto Giordano; Chuanrui Li; Jing Zhao; Peng Ren

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)