Abstract
Hybrid nanoSiO2 (HNS) modified cement pastes were explored as a kind of surface protection material (SPM). The carbonation resistance and mechanical properties of SPMs coated samples were tested. Thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscope (SEM), and mercury intrusion porosimetry (MIP) were further employed to evaluate the chemical composition and microstructure characteristics of SPM. Besides, thermodynamic modeling was adopted to simulate the changes in the phase assemblages of SPM under the carbonation process. The results showed that SPM with 1 wt% HNS could effectively enhance the carbonation resistance. The incorporation of HNS could densify the microstructure and refine the pore structure. Moreover, the thaumasite can be stable at ambient temperature with the addition of HNS, which is beneficial to maintain alkalinity under the carbonation process.
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Acknowledgments
The authors thank Jiangsu Research Institute of Building Science Co., Ltd and the State Key Laboratory of High-performance Civil Engineering Materials for funding this research project.
Funding
Funded by the National Natural Science Foundation of China (Nos.51808188, 52178202, 52108206) and the Fundamental Research Funds for the Central Universities (No.B210201041)
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Xia, K., Gu, Y., Jin, W. et al. Carbonation Resistance of Hybrid NanoSiO2 Modified Cementitious Surface Protection Materials. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 37, 855–862 (2022). https://doi.org/10.1007/s11595-022-2607-y
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DOI: https://doi.org/10.1007/s11595-022-2607-y