The Effect of Fly Ash Based Geopolymer on the Strength of Problematic Subgrade Soil with High CaO Content

Kwad, Nawfal Farooq; Abdulkareem, Ahmed H.; Ahmed, Taher M.

doi:10.1007/978-3-030-48679-2_51

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…Past studies have shown that the recommended NH concentration for geopolymerization purposes is 12 M [67][68][69] or even at 10 M NH concentration [97,106]. However, lower NH concentrations are also effective, and an 8 M NH concentration was adopted by several researchers [59,[107][108][109]. Very high NH concentrations, such as 15 M, should be avoided, as they create a semi-plastic geopolymer compound [39] that cannot be mixed properly due to the reduced workability.…”

Section: Alkali Activator Type Concentration and Ratiomentioning

confidence: 99%

A Review of Advances in Peat Soil Stabilisation Technology: Exploring the Potential of Palm Oil Fuel Ash Geopolymer as a Soil Stabiliser Material

Amaludin,

Asrah,

Mohamad

2023

Civ Eng J

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This study aims to highlight the latest developments in the field of peat soil stabilisation technology via chemical stabilisation. The review examines the use of traditional stabilisers such as OPC and various non-traditional stabiliser materials, i.e., Palm Oil Fuel Ash (POFA)-OPC blends, chemical solutions, and geopolymer materials, to enhance the Unconfined Compressive Strength (UCS) characteristics of peat soils based on the ASTM D 4609 requirements. OPC, POFA-OPC blends, and alkaline solutions mostly produced stabilised soil samples that fell short of the ASTM requirements. Existing studies on the use of waste-derived geopolymers to treat peat soils are limited, while the use of POFA geopolymer materials has mostly focused on the improvement of clayey and silty soils. The results of soil stabilisation with geopolymer were very encouraging, as the strength gains were in line with the ASTM soil strength requirements. As a result of this review, it can be concluded that POFA geopolymer is a viable soil stabiliser material with the addition of Ground Granulated Blast Furnace Slag, and that the use of POFA-GGBFS geopolymer to enhance the strength properties of peat soils should be investigated. Doi: 10.28991/CEJ-2023-09-08-017 Full Text: PDF

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Section: Alkali Activator Type Concentration and Ratiomentioning

confidence: 99%

A Review of Advances in Peat Soil Stabilisation Technology: Exploring the Potential of Palm Oil Fuel Ash Geopolymer as a Soil Stabiliser Material

Amaludin,

Asrah,

Mohamad

2023

Civ Eng J

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“…Due to its impact on the soil's compressibility behavior, swelling characteristics, and shear strength, compaction is essential to creating fly ash geopolymer-stabilized soil. The compaction qualities of soil were shown to be improved by the addition of fly ash [36]. The dry unit weight of the soil exhibited an upward trend as the fly ash concentration rose, reaching a peak at a specific percentage.…”

Section: Introductionmentioning

confidence: 99%

Compaction Properties of the Fly-Ash Based Geopolymer on Silt Soil

Hartono

2024

GEOMATE

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This study investigates the effect of varying the alkali ratio and the molarity of NaOH on the compaction properties of silt stabilized with fly ash-based geopolymers. Geopolymers offer an ecologically sound alternative to traditional cementitious materials and show promise in soil stabilization applications. Fly ash is a frequently utilized precursor in producing geopolymers. Although the benefits of utilizing fly ash as a precursor for geopolymer creation and its potential for stabilizing soil have been recognized, there has been insufficient exploration into refining alkali ratios and NaOH molarities to obtain the desired compaction characteristics. This study examines the compaction characteristics of stabilized silt soil by studying the effects of alkali ratio and NaOH molarity. The standard Proctor compaction test has determined the optimum moisture content (OMC) and maximum dry density (MDD). The results indicate that the utilization of fly ash geopolymer stabilization can improve the compaction characteristics of soil by increasing its MDD and decreasing its OMC. The observed MDD reached its highest value of 16.23 kN/m 3 . The fly ash geopolymer stabilization MDD was reached with 14 molars of sodium hydroxide and a ratio of 2 for the alkali activator. The OMC value of 9.12% was also reached in the same conditions. The alkali ratio and NaOH molarity had a significant impact on the compaction parameters of geopolymer-stabilized silt soil. Understanding the impact of these factors is crucial for the success of soil stabilization projects.

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“…Reference [11] stabilized the base as well as subbase layers by mixing RAP materials with fly ash. The mechanical and physical characteristics of subgrade soil were improved by adding 10, 20, 30, 40 and 50% RAP to this soil [12].…”

Section: Introductionmentioning

confidence: 99%

The Effect of CKD and RAP on the Mechanical Properties of Subgrade Soils

saeed¹,

Abdulkareem²,

Abd³

2022

AJES

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The construction of pavement layers on subgrade soil with good characteristics decreases the thickness of these layers, which in turn lowers the cost of building and maintaining roadways. However, it is impossible to avoid constructing pavements on unsuitable subgrade due to a number of limitations. Using conventional additives like lime and cement to improve subgrade properties results in additional costs. As a result, utilizing by-products (cement kiln dust and reclaimed asphalt pavement) in this field has benefits for the environment, economy, and technology. Large amounts of cement kiln dust (CKD), a by-product material, are produced in Portland cement factories. On the other hand, large amounts of reclaimed asphalt pavement (RAP) are accumulated as a result of the rehabilitation of old roads. This paper discusses using CKD and RAP to improve the characteristics of poor subgrade layers by conducting a series of Unconfined Compressive Strength (UCS) and California Bearing Ratio (CBR) tests on samples of natural soil and soil stabilized with different percentages of CKD and RAP with different curing times to investigate their impacts on soil properties. The curing was carried out by wrapping the stabilized samples with several layers of nylon and then placing them in plastic bags at room temperature. The compaction results illustrated that the addition of CKD increases OMC and decreases MDD, in contrast to RAP, which decreases OMC and increases MDD. The addition of CKD and RAP led to a significant and unexpected increase in the CBR values. The results show that the soaked and unsoaked CBR values improve from 3.4% and 12.1% for natural soil to 220.1% and 211%, respectively, after adding 20% CKD and curing the samples for 28 days. Also, the addition of 25% RAP to soil-20% CKD blend increased the soaked and unsoaked CBR values to 251% and 215%, respectively. All the additions resulted in a significant reduction in swelling.

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The Effect of Fly Ash Based Geopolymer on the Strength of Problematic Subgrade Soil with High CaO Content

Cited by 10 publications

References 18 publications

A Review of Advances in Peat Soil Stabilisation Technology: Exploring the Potential of Palm Oil Fuel Ash Geopolymer as a Soil Stabiliser Material

A Review of Advances in Peat Soil Stabilisation Technology: Exploring the Potential of Palm Oil Fuel Ash Geopolymer as a Soil Stabiliser Material

Compaction Properties of the Fly-Ash Based Geopolymer on Silt Soil

The Effect of CKD and RAP on the Mechanical Properties of Subgrade Soils

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