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Carbonation of sulphoaluminate cement with layered double hydroxides |
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| Authors: | Haining Geng Ping Duan Wei Chen Zhonghe Shui |
| Affiliation: | 1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China 2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China 3. Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China |
| Abstract: | The increasing importance of the ecologically minded production of building materials makes it necessary to develop reasonable alternatives to the CO2-intense production of ordinary Portland cement (OPC). The development of new or modified concrete is an important part of existing strategies to improve performance and minimize life-cycle costs. Therefore, we investigated carbonation resistance properties of sulphoaluminate cement (SAC) concrete incorporating layered double hydroxides (LDHs). X-ray diffraction (XRD) and IR-spectroscopy were employed to characterize the component and structural changes of LDHs and cement paste before and after carbonation test. Carbonation resistance of concrete was experimentally evaluated. Finally, carbonation of Portland cement and SAC concrete was compared. The experimental results show that carbonation depth decreases remarkably with the addition of LDHs, especially the calcinated LDHs. Carbonation depth of SAC concrete is smaller than that of PC concrete regardless of curing time. |
| Keywords: | sulphoaluminate cement carbonation layered double hydroxides |
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