Investigation to some Preliminary Geotechnical Properties of Soft Clay Stabilized by Fly Ash Based Geopolymers

Abbas, Jasim M.; Ibrahim, Amer M.; Shihab, Abdalla M Shihab M

doi:10.4028/www.scientific.net/kem.857.259

Cited by 4 publications

(2 citation statements)

References 12 publications

(13 reference statements)

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“…A more dense microstructure formed between soil particles with the use of a geopolymer binder, improving the soil's volume stability and mechanical characteristics [20], As a result, the geopolymer may be used for both shallow-and deep-depth soil stabilization (e.g., in the pavement's base or subbase, embankment, shallow foundations, airport building, etc.) [21][22][23][24]. According to the researcher's knowledge, geopolymer has not been used to enhance the properties of gypseous soil, the aim of this study is to improve the mechanical properties of gypseous soil by examining the compressibility, collapsibility, and strength characteristics of soil before and after undergoing geopolymer treatment.…”

Section: Introductionmentioning

confidence: 99%

Geotechnical Behaviour of Gypseous Soil Treated by Geopolymer Additives

Mahmood,

Hussein Hamed,

Ibrahim

2023

DJES

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Gypseous soil is well-known for its numerous engineering problems. When this soil is exposed to water, the gypsum in the soil dissolves, causing the buildings built on it to collapse; so, treating gypseous soil is important for improving its engineering characteristics. The present paper focuses on studying the effect of adding geopolymer on mechanical characteristics of gypseous soil. This study presents the results obtained from a series of experimental tests, including direct shear, consolidation, and collapsibility tests. Tests were conducted on samples of gypseous soil taken from depth 1.5 meters below ground level with gypsum content of 41%. The geopolymer was used in three different molarities for the collapse test (10M, 12M, and 14M) and a 14 molarity only for the shear and consolidation tests, where equal proportions of fly ash were combined with an alkaline activator that was composed of sodium hydroxide and sodium silicate. The binder (fly ash + alkaline) to the soil was added to the treated samples during mixing at a rate of 20% by weight. The findings showed that treating the soil with geopolymer leads to a notable enhancement in the angle of internal friction of the soil particles from (37 to 42) degrees. as well as a reduction in the soil compressibility and a reduction in the susceptibility of the soil to collapse, with an improvement degree of 64% when using a geopolymer with a molarity of 14 M. This improvement was achieved by using a geopolymer with a higher concentration of NaOH. The best results were achieved when a geopolymer with a molarity of 14 was used, which is the ideal ratio.

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Section: Introductionmentioning

confidence: 99%

Geotechnical Behaviour of Gypseous Soil Treated by Geopolymer Additives

Mahmood,

Hussein Hamed,

Ibrahim

2023

DJES

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“…Abbas et al [14] studied the stabilization of soft clay using FA-based geopolymer. Energy dispersive spectroscopy "EDS" and XRD examinations allowed for identifying the elemental composition and mineralogical content.…”

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confidence: 99%

A Review on Stabilization of Soft Soils with Geopolymerization of Industrial Wastes

Wassie¹,

Demir²

2023

IJEM

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Geopolymers are inorganic aluminosilicate polymers that solidify into ceramic-like substances at temperatures close to ambient. The elements in silicate oxide (SiO 2 ) and aluminum oxide (Al 2 O 3 ) are essential for the hardening of geopolymers because they combine with other elements to create N-A-S-H formation, which gives the material its distinctive strength. Geopolymers based on industrial wastes are increasingly being used to stabilize soft soils. Fly ash, GGBS, metakaolin, glass powders, and others are a few of the industrial wastes that aid in synthesizing geopolymers. Several experimental studies were carried out to determine the mechanical strength, durability, and microstructure improvement of soft soils stabilized with geopolymers. Some of the experiments include X-ray diffraction (XRD), scanning electron microscopy (SEM), unconfined compression testing (UCS), and durability testing. The main objective of this review was to assess the different types of binders, binder ratios, alkali activator types, alkali activator concentrations, and other parameters used in synthesizing geopolymers. The binder's proportion varies between 5% and 30% of the soil's dry weight. Researchers commonly use sodium silicate (Na 2 SiO 3 ) and sodium hydroxide (NaOH) solution for the alkali activator. Since the unconfined compression test is one of the quickest and least expensive ways to determine shear strength, most researchers were used to measure stabilized soils' mechanical strength. This paper highlights the most frequently used industrial wastes used to synthesize geopolymers. The review enables researchers to acquire essential and complementary inputs for future research.

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A Data-Driven Influential Factor Analysis Method for Fly Ash–Based Geopolymer Using Optimized Machine-Learning Algorithms

Cui

Huang

et al. 2022

J. Mater. Civ. Eng.

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Investigation to some Preliminary Geotechnical Properties of Soft Clay Stabilized by Fly Ash Based Geopolymers

Cited by 4 publications

References 12 publications

Geotechnical Behaviour of Gypseous Soil Treated by Geopolymer Additives

Geotechnical Behaviour of Gypseous Soil Treated by Geopolymer Additives

A Review on Stabilization of Soft Soils with Geopolymerization of Industrial Wastes

A Data-Driven Influential Factor Analysis Method for Fly Ash–Based Geopolymer Using Optimized Machine-Learning Algorithms

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