Thermodynamic and kinetic study of LC3 cement during sulfate attack

Document Type : Research Article

Authors

1 Shahid Rajaee Teacher Training University

2 Shahid RajaeeTeacher Training University

3 Department of Geotechnical Engineering and Water Engineering, Shahid Rajaee Teacher Training University

Abstract

Concrete is the most common materials for the construction. One of the most important issues about the concrete construction design is the service life of structure. The concrete sulfate attack as the well-known concrete deterioration problem reduces the service life of concrete structures. In this study, LC3 cement (limestone calcined clay cement) as an eco-friendly cement due to the reduction of clincker demand, and also as an effective solution for the increasing the cement durability in sulfate-rich environments has been studied. A thermodynamic simulation has been conducted to evaluate the performance of LC3 cement (limestone calcined clay cement) against the sulfate attack, with the consideration of the time parameter, using a thermodynamic software. The simulation results are compared with experimental and modeling results to the confirmation of present model accuracy. The comparison of result shows the suitable conformity. In this study, different kinetics level for ettringite and gypsum (as the main products of sulfate attack) formation has been introduced. Analyzing kinetics diagrams show that high Calcined Clay/ Calcined Clay + Limestone ratio leads to reduction of ettringite and gypsum formation amount and formation rate during the sulfate attack, however Calcined Clay/ Calcined Clay + Limestone ratio of 0.6 could be consider as the optimal ratio because of better kinetics performance.

Keywords

Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 56, Issue 6
2024
Pages 729-748

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