Resistance and swelling of Tabriz marl soils stabilised using nano-silica and nano-alumina

The effects of nano-silica (NS) and nano-alumina (NA) additions on problematic marl soil in Tabriz, Iran were investigated. Marl soils constitute the foundations for most projects in Tabriz. Due to water absorption, these soils are liable to volume change, leading to instability risks in the foundat...

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Bibliographic Details
Published in:Proceedings of the Institution of Civil Engineers. Geotechnical engineering 2022-01, Vol.176 (4), p.326-339
Main Authors: Alipour, Rasoul, Heshmati R, Ali Akbar, Karimiazar, Jafar, Esazadefar, Narges, Asghari-Kaljahi, Ebrahim, Bahmani, Sayed Hessam
Format: Article
Language:English
Subjects:
Additives
Aluminum oxide
Atterberg limits
California bearing ratio
Electron microscopy
Emission analysis
Environmental effects
Field emission microscopy
Foundations
Lime soil stabilization
Marl
Penetration tests
Portland cement
Portland cements
Scanning electron microscopy
Silica
Silicon dioxide
Soil
Soil investigations
Soil lime
Soil stabilization
Soil swelling
Soil water
Soils
Swelling pressure
Water absorption
X ray powder diffraction
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Summary:The effects of nano-silica (NS) and nano-alumina (NA) additions on problematic marl soil in Tabriz, Iran were investigated. Marl soils constitute the foundations for most projects in Tabriz. Due to water absorption, these soils are liable to volume change, leading to instability risks in the foundations. Various physical and chemical methods have been employed to stabilise these soils. In the present study, for the first time, reconstructed samples of Tabriz marl were stabilised with various percentages of NS and NA, which have fewer negative environmental effects compared with ordinary additives such as Portland cement or lime. Soil swelling behaviours were evaluated experimentally using tests for Atterberg limits, density, free swelling, swelling pressure, California bearing ratio (CBR) and direct shear. Field emission scanning electron microscopy and X-ray powder diffraction analyses were conducted at curing times of 1, 7 and 28 days. It was found that NA had a greater effect on reducing the swelling of stabilised samples than NS. However, NS had a greater effect on increasing the strength (CBR).
ISSN:1353-2618
1751-8563
DOI:10.1680/jgeen.21.00016