Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Stabilization of silty sand using bentonite‑magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization
https://orcid.org/0000-0002-3808-0670
Abstract This paper investigates the mechanical, physicochemical, and microstructural characterization of treated silty sand using a novel additive. The additive from a mixture of bentonite, magnesium chloride, and alkaline solution was introduced for stabilization of soil. Atterberg limits, compaction, pH, and unconfined compressive strength (UCS) tests were used to assess the mechanical and physicochemical properties of the stabilized soil. Further investigation results on the optimum designed sample are discussed based on microstructural analysis using X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), Energy Dispersive Spectroscopy (EDS), and Fourier transform infrared spectroscopy (FTIR). Two curing types: unheated and heated at 60 °C for 24 h, were observed at 7, 14, 28 and 60 days in ambient temperature. Overall, it was found that the chemical additive improved the compressive strength of the soil and the heated curing tests showed significant strength improvement. The mechanical and physicochemical results revealed an optimum mix to improve silty sand strength using the addition of 40% bentonite with an alkaline activator (SS/SH) ratio of 0.5, an alkaline activator-to-MgCl2 (L/S) ratio of 0.7, and 3% MgCl2 by dry weight of the soil under heat curing condition at 60 °C for 24 h. The microstructure analysis confirmed the formation of the cementitious products, such as calcium aluminium silicate hydrate (C-(A)-S-H) and magnesium silicate hydrate (M-S-H) in the treated sample.
Highlights A mixture of bentonite, magnesium chloride, and alkaline activator solution was used to develop a new additive. Mechanical and physicochemical properties of the stabilized soil were studied. Optimum designed sample are discussed based on microstructural analysis. The microstructure analysis confirmed the formation of the C-(A)-S-H and M-S-H products in the treated samples.
Stabilization of silty sand using bentonite‑magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization
https://orcid.org/0000-0002-3808-0670
Abstract This paper investigates the mechanical, physicochemical, and microstructural characterization of treated silty sand using a novel additive. The additive from a mixture of bentonite, magnesium chloride, and alkaline solution was introduced for stabilization of soil. Atterberg limits, compaction, pH, and unconfined compressive strength (UCS) tests were used to assess the mechanical and physicochemical properties of the stabilized soil. Further investigation results on the optimum designed sample are discussed based on microstructural analysis using X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), Energy Dispersive Spectroscopy (EDS), and Fourier transform infrared spectroscopy (FTIR). Two curing types: unheated and heated at 60 °C for 24 h, were observed at 7, 14, 28 and 60 days in ambient temperature. Overall, it was found that the chemical additive improved the compressive strength of the soil and the heated curing tests showed significant strength improvement. The mechanical and physicochemical results revealed an optimum mix to improve silty sand strength using the addition of 40% bentonite with an alkaline activator (SS/SH) ratio of 0.5, an alkaline activator-to-MgCl2 (L/S) ratio of 0.7, and 3% MgCl2 by dry weight of the soil under heat curing condition at 60 °C for 24 h. The microstructure analysis confirmed the formation of the cementitious products, such as calcium aluminium silicate hydrate (C-(A)-S-H) and magnesium silicate hydrate (M-S-H) in the treated sample.
Highlights A mixture of bentonite, magnesium chloride, and alkaline activator solution was used to develop a new additive. Mechanical and physicochemical properties of the stabilized soil were studied. Optimum designed sample are discussed based on microstructural analysis. The microstructure analysis confirmed the formation of the C-(A)-S-H and M-S-H products in the treated samples.
Stabilization of silty sand using bentonite‑magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization
https://orcid.org/0000-0002-3808-0670
Abstract This paper investigates the mechanical, physicochemical, and microstructural characterization of treated silty sand using a novel additive. The additive from a mixture of bentonite, magnesium chloride, and alkaline solution was introduced for stabilization of soil. Atterberg limits, compaction, pH, and unconfined compressive strength (UCS) tests were used to assess the mechanical and physicochemical properties of the stabilized soil. Further investigation results on the optimum designed sample are discussed based on microstructural analysis using X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), Energy Dispersive Spectroscopy (EDS), and Fourier transform infrared spectroscopy (FTIR). Two curing types: unheated and heated at 60 °C for 24 h, were observed at 7, 14, 28 and 60 days in ambient temperature. Overall, it was found that the chemical additive improved the compressive strength of the soil and the heated curing tests showed significant strength improvement. The mechanical and physicochemical results revealed an optimum mix to improve silty sand strength using the addition of 40% bentonite with an alkaline activator (SS/SH) ratio of 0.5, an alkaline activator-to-MgCl2 (L/S) ratio of 0.7, and 3% MgCl2 by dry weight of the soil under heat curing condition at 60 °C for 24 h. The microstructure analysis confirmed the formation of the cementitious products, such as calcium aluminium silicate hydrate (C-(A)-S-H) and magnesium silicate hydrate (M-S-H) in the treated sample.
Highlights A mixture of bentonite, magnesium chloride, and alkaline activator solution was used to develop a new additive. Mechanical and physicochemical properties of the stabilized soil were studied. Optimum designed sample are discussed based on microstructural analysis. The microstructure analysis confirmed the formation of the C-(A)-S-H and M-S-H products in the treated samples.
Stabilization of silty sand using bentonite‑magnesium-alkalinization: Mechanical, physicochemical and microstructural characterization
Muhammad, Nurmunira (Autor:in) / Siddiqua, Sumi (Autor:in)
Applied Clay Science ; 183
04.10.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Physical and mechanical properties of a compacted silty sand with low bentonite fraction
| British Library Online Contents | 1998
Physical and mechanical properties of a compacted silty sand with low bentonite fraction
| Online Contents | 1998
Stabilization of Silty Sand with Nontraditional Additives
| British Library Online Contents | 2001
Stabilization of Silty Sand with Nontraditional Additives
| British Library Conference Proceedings | 2002