Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Study of the evolution of properties of mortar under sulfate attack at different concentrations
In this study, the samples of ordinary Portland cement mortar were fully immersed in sodium sulfate solutions of different concentrations (0%, 5% and 15%) for up to 270 d. The evolution of the properties of the samples (compressive strength, static modulus of elasticity, stress-strain behaviour, hardened density, water permeability coefficient and length change) was monitored. The surface deterioration of the samples was also observed and the morphological features of the products were investigated using scanning electron microscopy. Water immersion was found to improve for the properties of the samples and reduce the water permeability coefficient. Moreover, at the initial stage of sodium sulfate attack, the presence of sulfate ions had a positive effect on the evolution of the properties due to the formation of ettringite and gypsum. Afterwards, the samples immersed in sodium sulfate solution showed a degradation in the properties, induced by the expansion of expansive products and the generation of micro-cracks. Furthermore, the mortar immersed in sodium sulfate solution showed higher expansion and a larger hardened density than the mortar immersed in water. An increase in the concentration of the sodium sulfate solution was found to reduce the time needed to reach peak properties and to accelerate deterioration of the properties at the late stage.
Study of the evolution of properties of mortar under sulfate attack at different concentrations
In this study, the samples of ordinary Portland cement mortar were fully immersed in sodium sulfate solutions of different concentrations (0%, 5% and 15%) for up to 270 d. The evolution of the properties of the samples (compressive strength, static modulus of elasticity, stress-strain behaviour, hardened density, water permeability coefficient and length change) was monitored. The surface deterioration of the samples was also observed and the morphological features of the products were investigated using scanning electron microscopy. Water immersion was found to improve for the properties of the samples and reduce the water permeability coefficient. Moreover, at the initial stage of sodium sulfate attack, the presence of sulfate ions had a positive effect on the evolution of the properties due to the formation of ettringite and gypsum. Afterwards, the samples immersed in sodium sulfate solution showed a degradation in the properties, induced by the expansion of expansive products and the generation of micro-cracks. Furthermore, the mortar immersed in sodium sulfate solution showed higher expansion and a larger hardened density than the mortar immersed in water. An increase in the concentration of the sodium sulfate solution was found to reduce the time needed to reach peak properties and to accelerate deterioration of the properties at the late stage.
Study of the evolution of properties of mortar under sulfate attack at different concentrations
Yu, Xiaotong (Autor:in) / Zhu, Yuwen / Liao, Yingdi / Chen, Da
2016
Aufsatz (Zeitschrift)
Englisch
Study on the evolution of dynamic mechanics properties of cement mortar under sulfate attack
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Study on the evolution of dynamic mechanics properties of cement mortar under sulfate attack
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Numerical modelling of mechanical deterioration of cement mortar under external sulfate attack
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Numerical modelling of mechanical deterioration of cement mortar under external sulfate attack
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Influence of Sulfate Attack and Drying-Wetting Cycle on Properties of Mortar
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