Stabilization of an Expansive Soil Using Alkali Activated Fly Ash Based Geopolymer

Parhi, Partha Sarathi; Garanayak, Lasyamayee; Mahamaya, Mahasakti; Das, Sarat Kumar

doi:10.1007/978-3-319-61931-6_4

Cited by 34 publications

(26 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At between higher wave numbers of 1600 cm -1 ,1751 cm -1 and 2762 cm -1 , 4000 cm -1 for both of S1F and S1FR two main broad peaks of 1651 cm -1 and 3622 cm -1 with low intensities of 2% were observed indicating stretching and deformation vibrations of OH and H-O-H groups from the weakly bound water molecules, which were adsorbed on the surface or trapped in the cavities between the framework bonds of the activated specimen. These observations were similar to those reported by plenty of researchers [7][8][9][10][11][12][13][14][15][16][17].…”

Section: Microstructural Analysessupporting

confidence: 92%

“…Variety of research works have addressed the feasibility of introducing the aforesaid binder to remediate problematic soils. Their results drawn confirmed high stiffness and durability of treated soft soils [7][8][9][10][11][12][13][14][15]. Though, the alkaline activator used by the above mentioned trials was either Sodium hydroxide, a mix of Sodium hydroxide and Sodium silicate or a mix of Potassium hydroxide and Potassium silicate.…”

Section: Introductionmentioning

confidence: 70%

“…Although a Si/Al ratio above 2 was reported to indicate an optimum compressive strength gain [10], the rate of strength evolution over 28 days is substantial. The reason behind might be the increasing fly ash content present in the matrix, that contributed to a drastic increase in the compressive strength of the treated soil [8][9][10][11][12][13][14]. Fourier transform infrared spectroscopy (FTIR) was conducted to characterize the different bonds with short-range structural order for KSF as depicted in fig.…”

Section: Microstructural Analysesmentioning

confidence: 99%

See 2 more Smart Citations

Alkaline Activation of Clayey Soil Using Potassium Hydroxide & Fly Ash

Elkhebu

Zainorabidin

Bujang

et al. 2018

IJIE

View full text Add to dashboard Cite

In this paper the potential of introducing alkali activated fly ash to a clayey soil as stabilizing agent was investigated. As alkaline activator Potassium hydroxide of 12 M was introduced to the soil fly ash mixtures. Unconfined compressive strength tests were carried out. Four different fly ash/solid ratios were proposed to be 10 %, 20 %, 30 % and 40 % at two curing regimes of 7 & 28 days. The highest unconfined compressive strength was of 40 % mixture recorded at 3.68 MPa after 28 days. Alkaline activation of clayey soil using KOH solution as an activator proved to be a feasible alternative for soft soil stabilization.

show abstract

Section: Microstructural Analysessupporting

confidence: 92%

Section: Introductionmentioning

confidence: 70%

Section: Microstructural Analysesmentioning

confidence: 99%

See 1 more Smart Citation

Alkaline Activation of Clayey Soil Using Potassium Hydroxide & Fly Ash

Elkhebu

Zainorabidin

Bujang

et al. 2018

IJIE

View full text Add to dashboard Cite

show abstract

“…The stabilization of soft and expansive subgrade soils using activated fly ash has shown significant improvement in reaction kinetics and strength gain [22,64,71,77]. The effectiveness of geopolymerized fly ash in terms of the durability properties of rammed earth was also evaluated in some recent research [65,[78][79][80][81].…”

Section: Valorization Of Pulp and Paper Mill Fly Ashmentioning

confidence: 99%

Pulp and Paper Mill Fly Ash: A Review

Cherian

Siddiqua

2019

Sustainability

View full text Add to dashboard Cite

The continual growth of pulp and paper industry has led to the generation of tremendous volumes of fly ash as byproducts of biomass combustion processes. Commonly, a major part of it is landfilled; however, updated environmental regulations have tended to restrict the landfilling of fly ash due to rising disposal costs and the scarcity of suitable land. The pulp and paper industries are therefore urgently seeking energy-efficient mechanisms and management for the beneficial use of fly ash in an ecological and economical manner. This paper offers a comprehensive review of existing knowledge on the major physicochemical and toxicological properties of pulp and paper mill fly ash to assess its suitability for various bound and unbound applications. The current state of various methods used for the valorization of pulp and paper mill fly ash into more sustainable geomaterials is briefly discussed. This paper also presents promising and innovative applications for pulp and paper mill fly ash, with particular reference to agriculture and forestry, the construction and geotechnical industries, and the immobilization of contaminants. It was identified from a literature review that modified pulp and paper mill fly ash can be environmentally and economically advantageous over commercial coal-based fly ash in various sustainable applications.Sustainability 2019, 11, 4394 2 of 16 use of compost products, etc., are drawbacks of composting [10]. Contaminant-free PPFA has great significance as a soil liming agent and fertilizer in agriculture and forestry [6,11]; however, its direct application requires safety precautions due to its undesirable handling and spreading characteristics and associated health risks [12,13]. Further, high pH and electrical conductivity values of pore water in wood ash might have perturbing effects on the microbial community [14]. In order to withstand extreme conditions, the bacteria may enter a dormant stage, thereby decreasing the microbial population and diversity and ultimately disturbing the ecological balance. PPFA and value-added materials also have multifunctional engineering applications, such as supplementary cementitious material (SCM) in concrete systems, aggregate in pavement construction, binder for soil stabilization, and adsorbent for the immobilization of toxic heavy metals [15][16][17][18][19][20][21][22][23]. Based on a statistical survey conducted on the management and utilization of boiler ashes generated at Canadian pulp and paper mills, it was reported that more than 50% of ash is landfilled, 20-25% is used as a soil amendment (direct application or compost), and less than 20% is used for other beneficial applications such as the construction of embankment fills, the stabilization of pavement layers, and the solidification of wastes. [1,2].This paper reviews the existing knowledge on physicochemical and toxicological properties of PPFA in order to assess its suitability as a sustainable geomaterial for various bound and unbound applications. The bound applications of fly ash in...

show abstract

“…Besides the common modifiers such as lime and fly ash, some advanced methods like alkali activation method [31] and biological method [32] also have been studied. Each method has its applicable scope.…”

Section: Introductionmentioning

confidence: 99%

Study on Physical‐Mechanical Properties and Microstructure of Expansive Soil Stabilized with Fly Ash and Lime

Zhou

Zhang

et al. 2019

Advances in Civil Engineering

View full text Add to dashboard Cite

Fly ash and lime have been frequently employed to reduce the swelling potential of expansive soils. Laboratory experiments, scanning electron microscopy (SEM), and X-ray diffraction (XRD) were used in this study to investigate the stabilizing effect of fly ash and lime on expansive soils in the Jianghuai undulating plain area. The comparison was drawn between the variation laws of physical parameters, mechanical properties, microstructure, and mineral composition of expansive soil before and after being stabilized. Experimental results suggest that, after 5% lime is added based on fly ash, the plasticity index of the expansive soil decreases by 64.9%, the free swelling ratio is reduced to about 10%, the unloading swelling ratio is reduced to nearly 4%, and the stabilized soil no longer exhibits the expansive property. The unconfined compressive and tensile strengths of the stabilized soil increase first and then decrease with the rising in fly ash content. After the addition of 5% lime, both the unconfined compressive and tensile strengths increase significantly. The optimum modifier mixture ratio is obtained as 10% fly ash + 5% lime. The SEM images reveal that the microstructures of the stabilized expansive soil vary from an irregular flake-like and flocculent structures to blocky structures, and the soil samples compactness is enhanced. XRD results indicate that quartz is the main component of the stabilized soil. These are the underlying causes of the rise in the strength. The conclusions of this study can be referenced for the engineering design and construction of expansive soil in Jianghuai undulating plain area.

show abstract

Stabilization of an Expansive Soil Using Alkali Activated Fly Ash Based Geopolymer

Cited by 34 publications

References 12 publications

Alkaline Activation of Clayey Soil Using Potassium Hydroxide & Fly Ash

Alkaline Activation of Clayey Soil Using Potassium Hydroxide & Fly Ash

Pulp and Paper Mill Fly Ash: A Review

Study on Physical‐Mechanical Properties and Microstructure of Expansive Soil Stabilized with Fly Ash and Lime

Contact Info

Product

Resources

About