Silica Fume-Red Mud Based Geopolymer Stabilized Organic Soil

Rezaul Islam Choudhury; Monowar Hussain

doi:10.4028/p-vdLer9

Paper Titles

The Influence of Cow’s Bone Calcium Concentration on the Mechanical Characteristics of a Mg-Al Alloy
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Phase Prediction, Microstructure, and Microhardness of Sintered Nickel-Based Superalloy
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Process Optimization of Spark Plasma Sintered Parameters for Ti-Al-Cr-Nb-Ni-Cu-Co High Entropy Alloy by Response Surface Methodology
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Durability Studies of Conventional Cement Concrete and Geopolymer Concrete
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Effect of Particle Size and Molarity of Hardening Solution on the Mechanical Properties of New Geopolymeric Mortars Manufactured from Mine Tailings
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Silica Fume-Red Mud Based Geopolymer Stabilized Organic Soil
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Corrosion Resistance and Thermal Stability Enhancement of Green Layered Clay/Epoxy Coating
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Use of Domestic Waste Polyethylene as a Bitumen Modifier in Bituminous Pavement Applications
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Identification of Waste Potential from Maritime Activity - Incorporating Polyethylene Cables into Building Construction
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Silica Fume-Red Mud Based Geopolymer Stabilized Organic Soil

Abstract:

Organic soil presents significant challenges for construction due to its unsuitability as a soil type, often necessitating stabilization using conventional agents like cement. The Silica Fume (SF)-Red Mud (RM) binder mix emerges as a promising alternative stabilizer due to its low carbon footprint coupled with its superior strength-enhancing properties. In this study,we explore the feasibility of employing SF-RM based geopolymer to stabilize organic soil. To activate the collected samples, a solution of sodium hydroxide (NaOH) with molarity (M) of 6, 9, and 12 were utilized, as well as binder (SF + RM) proportions of 10%, 20%, 30%, and 40% relative to dried organic soil and alkali-to-binder (A/B) proportions of 0.5, 0.7, and 0.9, respectively. The experimental results reveal that a variety of factors, including NaOH molarity, A/B proportions, pH, and curing duration, have an effect on the unconfined compressive strength (UCS) of treated organic soil. The best combination was obtained with a binder concentration of 30%, a NaOH molarity of 9M, and an A/B proportion of 0.7. After 28 days of curing, the UCS of the treated organic soil (1714 kPa) was found to be 168 times that of the untreated organic soil (10.2kPa). Further, the production of compounds such as aluminium silicate, sodium aluminosilicate, and potassium aluminosilicate, which have been found by X-ray diffraction (XRD) research, can be ascribed to the increase in strength. Furthermore, when subjected to analysis through Field Emission Scanning Electron Microscopy (FESEM), it becomes evident that these items play a pivotal role in filling the voids within the soil-binder composite. As a consequence, they facilitate the creation of a more smoother, compact and denser structure.