Coupling effects of fiber and slag-based nano-geopolymer in improving the geo-mechanical performance of highly expansive soils

Articles in Press

Document Type : Research Article

Authors

1 Department of Civil Eng., College of Eng., Arak Branch, Islamic Azad University, Arak, Iran

2 2Department of Civil Engineering, College of Engineering, Hamedan Branch, Islamic Azad University, Hamedan, Iran

Abstract

This study assessed the effectiveness of an innovative nano-geopolymer (SNZBG) enhanced by fiber in improving the geo-mechanical performance and durability of highly expansive clays. The experimental results showed that the addition low contents of lime alone may have a relatively favorable influence in controlling the swelling potential of soil; however, the improvement of mechanical parameters requires considerable amounts of additives and long times of curing. It was also appeared that harsh conditions (including frequent periods of freezing and thawing, F-T) will lead to the deterioration of engineering properties. On the contrast, the application of proposed geopolymer not only could diminish the required lime and time of curing for successful modification of soil but also may significantly increase the durability of composites. The better performance upon the SNZBG application can be ascribed to increasing the solidification processes and reducing the tendency of clay surfaces to absorb water due to the more formation of geopolymeric nanostructures as well as the generation of physical clogged fabric. In this system, there was a dramatic reduction in the strength against the increase in external loadings. Inclusion of fibers plays a significant role in enhancing the ductility of soil-geopolymer matrix. The combined effect of SNZBG and fibers leads to an increase in the tensile capacity as well as a strong reduction in the degree of damage upon the F-T action. In general, it can be concluded that the treatment of swelling clayey soil with SNZBG/fiber is an effective approach compared to the traditional stabilization method.

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Amirkabir Journal of Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 03 October 2024

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