Effect of Silica Fume Addition on the Behavior of Silty-Clayey Soils | ||
| Journal of Engineering and Sustainable Development | ||
| Article 1, Volume 16, Issue 1, March 2012, Pages 92-105 | ||
| Authors | ||
| Muhammed A. Abdul Sattar; Khalida A. Daud; Adel A. Al-Azzawi | ||
| Abstract | ||
| The aim of this research is to investigate the effect of silica fume addition on the behavior of soil subgrades which has inadequate natural stability. Natural silty-clay soil and silty-clayey soil-silica fume mixtures were compacted at the optimum moisture content and subjected to various laboratory tests.. The test results showed a significant improvement on swelling pressure and compressive strength of composite samples with silica fume. The swelling pressure decreased by 87% with increasing silica fume contents from 5% to 15% for all samples and the compressive strength of clay samples increased by 4% with increasing silica fume contents from 5% to 10% and after that it decreased. It is observed that the permeability of soil increased with increasing silica fume content. The coefficient of permeability increased by 100% with increasing silica fume content to 15%. Also, the results show that the silica fume decreases the development of cracks on the surface of compacted clay samples through reducing crack width by 75%. The investigation showed that the silica fume is a valuable material to modify the properties of soil subgrade to make them suitable for construction. | ||
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