Microstructure of renovation plasters and their resistance to salt
| Autor: | Wacław Brachaczek |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science Moisture 0211 other engineering and technologies Salt (chemistry) 02 engineering and technology Building and Construction Porosimetry 010501 environmental sciences Microstructure 01 natural sciences Durability law.invention chemistry law 021105 building & construction General Materials Science Mortar Crystallization Composite material Porosity 0105 earth and related environmental sciences Civil and Structural Engineering |
| Zdroj: | Construction and Building Materials. 182:418-426 |
| ISSN: | 0950-0618 |
| DOI: | 10.1016/j.conbuildmat.2018.06.068 |
| Popis: | One of the most important factors which decide about the durability of the renovation plasters is the resistance to crystallization of salt which dissolves under the influence of moisture. This paper demonstrates the results of the research on the influence of the microstructure of pores in cement-lime mortars and their resistance to various cyclical salts. Six plasters differing in porosity and microstructure were selected for the study. The purpose of the study was to alternatively soak samples with three solutions of salts: NaCl at a concentration of 25.9%, Na2SO4 at 18.3% and NaNO3 at 45%, and then crystallize the salts. It was found that salts solutions have a various intensity of destructive effect on renovation plasters. It was demonstrated that the durability of plasters depends to a greater extent on the pore size distribution than on the total porosity Pc. Salts solutions do not have a destructive effect on plasters with a large variety of pores, whereas plasters with low porosity and monomodal pore size distribution were destroyed under the influence of Na2SO4 and NaNO3 solutions. Porosimetry and electron microscopy were used in the studies. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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