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A platform for research: civil engineering, architecture and urbanism
Simulation of Thaumasite Sulfate Attack on Portland Cement Mixtures Using Synthesized Cement Phases
In this work, a simulation of thaumasite sulfate attack on portland cement mixtures was performed, using synthesized cement phases. Three model systems containing , , and alkali sulfate (, , and , respectively) and a fourth one consisting of ettringite and C−S−H, were designed, and several mixtures were prepared. and were optionally added. Specimens stored at 5°C and 20°C in an atmosphere saturated in water vapor for 75 months were investigated with X-ray diffraction analysis and scanning electron microscopy. Thaumasite formed in all samples without at 5°C, and at 20°C when sulfates were derived from . Solid solution of thaumasite and ettringite was detected in samples incorporating and or at 5°C. This was also observed at 20°C when was the source of sulfates, whereas ettringite formed in the case of . The absence of thaumasite and ettringite in specimens containing and was attributed to the alkali carbonation process. In the fourth system, decomposition of ettringite occurred in the specimens exempt of . The work is supposed to contribute to understanding the primary causes of concrete damage when the concrete is subjected to long-term sulfate attack.
Simulation of Thaumasite Sulfate Attack on Portland Cement Mixtures Using Synthesized Cement Phases
In this work, a simulation of thaumasite sulfate attack on portland cement mixtures was performed, using synthesized cement phases. Three model systems containing , , and alkali sulfate (, , and , respectively) and a fourth one consisting of ettringite and C−S−H, were designed, and several mixtures were prepared. and were optionally added. Specimens stored at 5°C and 20°C in an atmosphere saturated in water vapor for 75 months were investigated with X-ray diffraction analysis and scanning electron microscopy. Thaumasite formed in all samples without at 5°C, and at 20°C when sulfates were derived from . Solid solution of thaumasite and ettringite was detected in samples incorporating and or at 5°C. This was also observed at 20°C when was the source of sulfates, whereas ettringite formed in the case of . The absence of thaumasite and ettringite in specimens containing and was attributed to the alkali carbonation process. In the fourth system, decomposition of ettringite occurred in the specimens exempt of . The work is supposed to contribute to understanding the primary causes of concrete damage when the concrete is subjected to long-term sulfate attack.
Simulation of Thaumasite Sulfate Attack on Portland Cement Mixtures Using Synthesized Cement Phases
Sotiriadis, Konstantinos (author) / Mróz, Radosław (author)
2018-12-08
Article (Journal)
Electronic Resource
Unknown
Simulation of Thaumasite Sulfate Attack on Portland Cement Mixtures Using Synthesized Cement Phases
| British Library Online Contents | 2019
| British Library Online Contents | 2013