The application of geopolymerization method to modify the yellow marl soil of Tabriz

Document Type : Research Article

Authors

1 Department, of civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz , Iran

2 Department, of civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz , Iran.

3 Department of civil Engineering, Islamic Azad university, Tabriz Branch

Abstract

Geopolymers produced by the reaction between solid aluminosilicate and an alkaline metal solution have been classified as the third-generation binders after lime and Portland cement. In the present study, the application of the above method to modify the behavior of the yellow marl soil of Tabriz has been evaluated by unconfined compression tests. For this purpose, zeolite and metaclay have been used as sources of silica-alumina, and sodium hydroxide solution have been used as an alkaline activator. The most important variables studied in this research include the weight percentages of main materials containing alumina silicate (zeolite and metaclay), the molarity of alkaline solution (NaOH), and the curing time. The results of the tests have shown the very appropriate effect of the geopolymerization mechanism in the treatment of the resistance structure of carbonated clay soil. Meanwhile, the zeolite geopolymer samples have higher resistance than the metaclay ones in all combinations and curing times. The effect of alkaline solution concentration on the strength of zeolite and metaclay geopolymer samples was not the same so that in the metaclay samples, increasing the molarity of alkali had a negative effect on the results. Also, the results show that the rate of change of resistance with respect to time depends on the concentration of alkaline solution so that the treatment effect reduces with the inhancement of alkali content. In the optimal sample of zeolite geopolymer (15% zeolite, 12 M alkaline), the uniaxial resistance is about 90.2 kg/cm2, which is about 26 times yellow marl one whereas the optimal metaclay geopolymeric matrix (15% metaclay, 4 M alkaline solution) has obtained an unconfined compression strength of about 17.86 kg/cm2. Also in the geopolymer samples, the failure strain has declined by 50% compared to the pure soil.

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References

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Amirkabir Journal of Civil Engineering
Volume 56, Issue 4
2024
Pages 457-476

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