Stabilization of Silty Sand Soils with lime and Microsilica Admixture in presence of Sulfates

Masoud Karimi, Ali Ghorbani, Younes Daghigh, Saeed Kia Alhosseini, Parham Rabbani

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Ground Improvement/Remediation

ABSTRACT: In recent decades, using byproducts of industries to avoid accumulation and keep environment pure and safe is a necessity. Microsilica is one of such byproducts which are harmful for human health and environment. It contains approximately 95% silicon dioxide which can be used as a material in soil improvement in mixture with lime. Admixing Microsilica Fume and Lime into silty sand causes a reaction between silicon dioxide (SiO) of Microsilica and calcium hydroxide (Ca (OH) ) of Lime and makes calcium silicate crystal which is a hard insoluble material. Such process increases strength parameters of soils. The main objective of this research is evaluation of effects of Microsilica and Lime admixtures on shear strength and swelling of Jandagh-Garmsar railway subgrade. The railway track of iran is located in the central desert of country. Therefore to determine the best composition of Microsilica and Lime to improve mentioned soil, CBR tests have been performed. Results show that the addition of microsilica-lime to the silty sand soil increases the CBR strength and decreases swelling. So microsilica waste material can be successfully used to enhance silty sand soil resistance. RÉSUMÉ- Microsilice est l'un des sous-produits qui sont nocifs pour la santé humaine et l'environnement. Il contient environ 95% (SiO) qui peut être utilisé comme matériau dans l'amélioration du sol dans le mélange avec de la chaux. Mélangeant Microsilice fumées et de chaux dans le sable vaseux provoque une réaction entre (SiO) de microsilice et (Ca (OH) ) de chaux et de cristaux de silicate de calcium fait qui est un matériau dur insolubles. Un tel processus augmente paramètres de résistance des sols L'objectif principal de cette recherche est l'évaluation des effets de microsilice et adjuvants chaux sur la résistance au cisaillement du sol et du sol enflure des Jandagh-Garmsar routier et ferroviaire sous-fondation.

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Cite this article:
Masoud Karimi; Ali Ghorbani; Younes Daghigh; Saeed Kia Alhosseini; Parham Rabbani (2011) Stabilization of Silty Sand Soils with lime and Microsilica Admixture in presence of Sulfates in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper323,author = Masoud Karimi; Ali Ghorbani; Younes Daghigh; Saeed Kia Alhosseini; Parham Rabbani ,title = Stabilization of Silty Sand Soils with lime and Microsilica Admixture in presence of Sulfates,year = 2011}