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Abstract
Foamed cement paste has been increasingly used as backfilling material in practice. The unique porous structure characteristic significantly influences the mechanical properties of foamed cement paste. This study conducted a series of laboratory tests to investigate the mechanical properties of nano-silica modified foamed cement paste. Foamed cement paste specimens with densities of 0.6 g/cm3 1.1 g/cm3 1.5 g/cm3 were prepared, incorporating nano-silica in varying concentrations from 1 g/L to 5 g/L. The density test and uniaxial compression test were conducted. The results show that the nano-silica improved the density inhomogeneity of the foamed cement paste and increased the peak strength. The optimal nano-silica content was 3 g/L in this study. This study offers a practical approach for enhancing the performance of foamed cement paste in engineering applications.
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Details
1 Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, and Department of Geotechnical Engineering, Tongji University , Shanghai , China