Stabilization of Clay Soils Using Fly Ash

Ünsever, Yeşim Sema; Diallo, Mamadou Lamine

doi:10.34248/bsengineering.564166

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Mixing fly ash, a byproduct of coal combustion, with the subsoil to improve its properties. Fly ash stabilises the soil through pozzolanic reactions (Afrin, 2017;Fluor & Roy, 2020;Kuswaya et al, 2018;Rahman et al, 2019;Ünsever & Diallo, 2019). An example of soil stabilisation with fly ash is shown in Figure 5.…”

Section: Fly Ash Soil Stabilisation Methodsmentioning

confidence: 99%

Review of Subgrade Soil Stabilised with Natural and Synthetic Fibres

Nathen,

Arshad,

Rais

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Subgrade soil is an essential component in the design of road structures as it provides lateral support to the roadway. One of the main reasons for pavement failure is subgrade settlement, which leads to a loss of subgrade strength. If the mechanical properties of subsoils are lower than required, a soil stabilisation method may be an option to improve the soil properties of the weak subsoil. Soil stabilisation is one of the techniques for improving poor subsoil, which results in significant improvement in tensile strength, shear strength and bearing capacity of subsoil. Soil stabilisation can be broadly divided into four types: thermal, electrical, mechanical, and chemical. The most common method of improving the physical and mechanical properties of soils is stabilisation with binders such as cement and lime. However, soil stabilisation with conventional methods using cement and lime has become uneconomical in recent years, so an alternative such as fibres may be sought. This review provides a comprehensive comparison of the effectiveness of natural fibres and synthetic fibres in stabilising subgrade soils.

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Section: Fly Ash Soil Stabilisation Methodsmentioning

confidence: 99%

Review of Subgrade Soil Stabilised with Natural and Synthetic Fibres

Nathen,

Arshad,

Rais

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…Additionally, although cement provides resistance to the stabilized soil, it can generate thermal expansion and contraction during its hydration. In this sense, the environmental and economic crisis that our surroundings are experiencing have forced a change in approaches such as soil stabilization, using materials that seek to improve their quality and resistance for use in construction, with a low impact on their carbon footprint and the optimization of natural resources [6][7][8][9]. Among the materials that meet these characteristics are the waste and by-products of the industry, such as ashes, slag, sludge, coal gangue, glass powder, and residues from chemical processes, among others [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Mechanical Properties of a Stabilized Subgrade Type Soil under a Sustainable Approach for Construction

Gallego-Quintana,

Ojeda-Farias,

Alvarez-Rosario

et al. 2023

Materials

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This article presents an experimental study to analyze the mechanical properties of a soil stabilized with ordinary Portland cement (OPC) under a sustainable approach consisting of a significant substitution of OPC for sugarcane bagasse ash (SCBA) to reduce the quantity of cement used in the stabilization, reaching the necessary mechanical requirements for its use as a subgrade layer. Soil specimens were elaborated with 3%, 5%, and 7% OPC as a stabilizing agent by weight of the soil. These mixtures were then partially substituted with 25%, 50%, and 75% SCBA, with these percentages being by weight of the stabilizer (OPC). Compaction, compressive strength, and California bearing ratio (CBR) tests were performed to evaluate the mechanical properties of the specimens. The results indicate that a 25% substitution of OPC by SCBA shows a similar performance to the mixture with only Portland cement, so a reduction in OPC use can be made. Further, with a substitution of 100% OPC by SCBA, the CBR of natural soil without stabilizers is improved.

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Effective use of Waste Materials: A Case Study of Utilization of Fly Ash in Flexible Pavement Structures

Gazder,

Arifuzzaman,

Abid

2024

Qeios

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Generation of energy through thermal processes is still dominant in many parts of the world. One of the by-products of this process is fly ash, whose safe disposal incurs monetary and environmental costs. To mitigate this issue, utilization of fly ash, as a construction material, has been increasing remarkably; however, evaluation and summarization of its use in pavement construction are not very common. This study reviews its utilization in construction from different aspects and attempts to fill the gap within the literature with a critical review of fly ash usage in pavement construction engineering for the last few decades. Further recommendations have also been suggested in this context. Class ‘C’ fly ash is used for soil stabilization and class ‘F’ is used in concrete. Review of the literature found the following results. Application of fly ash, in both flexible (asphalt) and rigid (concrete) pavement, is common in the form of a filler material. However, this paper only focuses on its use in flexible pavement layers. In the case of flexible pavement, fly ash is used can be used in surface, base, and sub-grade layers. The surface layer is made up of concrete, wherein it can be used as mineral filler or partial replacement of asphalt. The most common types of test performed on asphalt concrete are Marshall stability and tensile strength. However, there is a lack of field testing studies on asphalt concrete modified with fly ash. As for the other layers of flexible pavement, fly ash has been used with activators for their stabilization as these layers are made up of natural compact materials. Fly ash has shown promising results when used with cement, with both used within a proportion of 10%. The future research areas, identified through this review, are modeling of pavement layers modified with fly ash, and standardization of fly ash properties for use in pavement layers.

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Stabilization of Clay Soils Using Fly Ash

Cited by 3 publications

References 10 publications

Review of Subgrade Soil Stabilised with Natural and Synthetic Fibres

Review of Subgrade Soil Stabilised with Natural and Synthetic Fibres

Analysis of the Mechanical Properties of a Stabilized Subgrade Type Soil under a Sustainable Approach for Construction

Effective use of Waste Materials: A Case Study of Utilization of Fly Ash in Flexible Pavement Structures

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