Optimization of alkali-activated binders using natural minerals and industrial waste materials as precursor materials

Al-Duais, Ibrahim N. A.; Ahmad, Shamsad; Al‐Osta, Mohammed A.; Maslehuddin, Mohammed; Saleh, Tawfik A.; Al‐Dulaijan, Salah U.

doi:10.1016/j.jobe.2023.106230

Cited by 7 publications

(4 citation statements)

References 64 publications

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“…The second mechanism is the pozzolanic reaction, which further produces magnesium aluminate silicate hydrate gel. This occurs when magnesium and silica react with aluminium present in the precursor (POFA) [41,64]. It was demonstrated that the Mg interaction is time-dependent and that the bonding of soil particles with POFA-based MgO develops over time.…”

Section: Resultsmentioning

confidence: 99%

Numerical Analysis of Time-Dependent Strength and Stiffness in Palm Oil Fuel Ash-Stabilized Soil: Early and Long-Term Effects

Al-Dalain,

Ezreig,

Ismail

2024

Civ Eng J

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Over the years, investigating the behavior of soft soil, stabilized using different techniques, has been recognized as a critical priority for geotechnical engineers. Numerous soil constitutive models have been utilized to simulate stabilized soil behavior, improve strength and ductility, and analyze load-deformation responses. However, further investigation is required to study stabilized soil's time-dependent strength and stiffness, especially at an early curing age. Early strength and stiffness development is crucial in engineering construction for improving building quality and efficiency and minimizing crack risk. Furthermore, estimating UCS from an early age aid in safety evaluation and ground-improvement analysis. Researchers are increasingly recognizing palm oil fuel ash (POFA) as an eco-friendly alternative to traditional soil stabilizers due to its abundant availability. This study proposes an advanced concrete constitutive model to simulate the time-dependent strength and stiffness of POFA-stabilized and cement-stabilized soil due to pozzolanic interactions. The model accurately measures strength and stiffness improvement from an early curing age to 28 days using finite element analysis (FEA) before then comparing the experimental results. Based on the experimental results, the UCS values of palm oil fuel ash-stabilized soil grew to 3.18 MPa and 3.89 MPa after seven and 28 days with an optimum content of 30% (POFA): 10% Magnesium Oxide (MgO). It exhibited a significant increase in early strength with 64.02% compared with cement-stabilized soil. For stiffness results, a slight increment of 9.26% was observed. Employing FEM, the sensitivity of the parameters to stress-strain behavior was investigated. Finally, the validity of the concrete constitutive model to predict the time-dependent strength and stiffness of stabilized soil was proved. Doi: 10.28991/CEJ-SP2024-010-05 Full Text: PDF

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Section: Resultsmentioning

confidence: 99%

Numerical Analysis of Time-Dependent Strength and Stiffness in Palm Oil Fuel Ash-Stabilized Soil: Early and Long-Term Effects

Al-Dalain,

Ezreig,

Ismail

2024

Civ Eng J

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“…The resulting samples exhibited 28-day compressive strengths ranging from 28.5 to 32 MPa, 24.15 to 31.8 MPa, 24.2 to 33.1 MPa, 15.33 to 31.16 MPa, and 19.7 to 34.1 MPa. This study's outcomes facilitated the identification of the optimal proportions of selected precursor materials and the ideal combination of A/P ratio, NS/NH ratio, NH molarity, and W/P ratio for producing high-performance AABs (Al-Duais et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Research on cement-free composites based on alkaline-activated waste materials

Nalewajko

2023

EiS

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The article presents a review of research conducted on cement-free concretes based on alkaline-activated waste materials. Research is conducted in order to create concretes that are in line with the doctrine of sustainable development. Their main assumption is the reuse of recycled materials in newly produced building materials without compromising their properties. In addition, attempts are made to eliminate Portland cement, replacing it partially or completely with fly ashes or metakaolin. Another modification of concrete consists of replacing natural aggregate with artificial aggregate. The research conducted on lightweight concretes based on fly ashes, and alkali-activated porous ash aggregate is also presented.

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“…The primary parameters influencing the characteristics of the AACs are the chemical, mineralogical, and morphological characteristics of FA and GGBS, the type of alkali-activator solution (AAS), and the curing regimes. Particularly when compared to FA-based AAC, the degree of reaction is greater in GGBS-based AAC at both low and high temperatures [6][7][8]. It has been shown that under heat curing conditions, a denser structure occurs from an increase in reaction intensity and kinetic energy [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Particularly when compared to FA-based AAC, the degree of reaction is greater in GGBS-based AAC at both low and high temperatures [6][7][8]. It has been shown that under heat curing conditions, a denser structure occurs from an increase in reaction intensity and kinetic energy [8,9]. Additionally, to make alkali activated binders, silicate-and oxide-based solutions are often used separately as alkali activator solutions [3,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructure of High-Strength Alkali-Activated Concrete Including High-Volumes of Waste Brick Powder Using Response Surface Methodology

Alkhurainej,

Tahwia,

Mahdy

2024

Journal of Al-Azhar University Engineering Sector

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The current study aims to produce and design high-strength alkali-activated concrete (AAC), containing carbon fiber (CF) and the optimum content of waste brick powder (WBP) as source materials. A response surface method (RSM) was empolyed to design and optimize the properties of AAC. Three main parameters selected for this study were WBP content, Na2SiO3/KOH ratio, and CF content. Seventeen AAC mixtures were generated by activating the source materials with an alkaline-activation solution of KOH and Na2SiO3. The fresh properties, compressive, flexural strengths and density of the AACs were evaluated. The fresh AAC mixtures containing less than 40% WBP were highly workable with a diameter of 195-215 mm. The compressive, flexural strengths and density responses ranged from 22 and 121.22MPa, from 2.10 and 9.6MPa and from 2116 to 2366 kg/m 3 . From expermental work, the optimum mix of WBP (5%), Na2SiO3/KOH ratio (1.90), and CF (1.0%) was found to develop the AAC with the optimum of WBP. According to microscopic investigation, the optimum mixture had a nonporous and dense microstructure compared other mixtures incorporated with WBP, which had best mechanical properties (111.15MPa, 8.3MPa and 2316kg/m 3 ). Finaly, it is possible to produce high strength AAC (70 MPa) with 40% waste brick powder content.

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Optimization of alkali-activated binders using natural minerals and industrial waste materials as precursor materials

Cited by 7 publications

References 64 publications

Numerical Analysis of Time-Dependent Strength and Stiffness in Palm Oil Fuel Ash-Stabilized Soil: Early and Long-Term Effects

Numerical Analysis of Time-Dependent Strength and Stiffness in Palm Oil Fuel Ash-Stabilized Soil: Early and Long-Term Effects

Research on cement-free composites based on alkaline-activated waste materials

Mechanical Properties and Microstructure of High-Strength Alkali-Activated Concrete Including High-Volumes of Waste Brick Powder Using Response Surface Methodology

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