Electromagnetic and mechanical properties of FA-GBFS geopolymer composite used for induction heating of airport pavement

Gu, Gonghui; Ma, Tao; Chen, Feng; Xu, Fang; Zhang, Jinglin

doi:10.1016/j.cemconcomp.2022.104503

Cited by 34 publications

(4 citation statements)

References 51 publications

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“…However, according to Loewenstein’s principle of aluminum incompatibility, Al–O–Al bonds cannot be produced during the synthesis of GPs. Too low Si/Al ratios thus result in the production of unreacted [SiO 4 ] 4– and [AlO 4 ] 5– tetrahedra, a reduced degree of geopolymerization, and an increased potential for efflorescence. ,,, Furthermore, higher Al contents, over a certain optimum value, can also lead to increased imprisonment of cations and, subsequently, increased rate of efflorescence . Hence, accurate optimization of the Si/Al and Al/M ratios is key to developing GPs with the required mechanical properties and high chemical durability.…”

Section: Factors Affecting the Properties Of Gpsmentioning

confidence: 99%

Review on Geopolymers as Wellbore Sealants: State of the Art Optimization for CO₂ Exposure and Perspectives

et al. 2023

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Wellbores used in underground production and storage activities, including carbon capture and storage (CCS), are typically sealed using sealants based on Ordinary Portland Cement (OPC). However, leakage along these seals or through them during CCS operations can pose a significant threat to long-term storage integrity. In this review paper, we explore the potential of geopolymer (GP) systems as alternative sealants in wells exposed to CO 2 during CCS. First, we discuss how key parameters control the mechanical properties, permeability, and chemical durability of GPs based on different starting materials as well as their optimum values. These parameters include the chemical and mineralogical composition, particle size, and particle shape of the precursor materials; the composition of the hardener; the chemistry of the full system (particularly the Si/Al, Si/(Na+K), Si/Ca, Si/Mg, and Si/Fe ratios); the water content of the mix; and the conditions under which curing occurs. Next, we review existing knowledge on the use of GPs as wellbore sealants to identify key knowledge gaps and challenges and the research needed to address these challenges. Our review shows the great potential of GPs as alternative wellbore sealant materials in CCS (as well as other applications) due to their high corrosion durability, low matrix permeability, and good mechanical properties. However, important challenges are identified that require further research, such as mix optimization, taking into account curing and exposure conditions and available starting materials; the development of optimalization workflows, along with building larger data sets on how the identified parameters affect GP properties, can streamline this optimization for future applications.

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Section: Factors Affecting the Properties Of Gpsmentioning

confidence: 99%

Review on Geopolymers as Wellbore Sealants: State of the Art Optimization for CO₂ Exposure and Perspectives

et al. 2023

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“…They found that Na 2 SO 4 content caused a relative prolongation of the induction period and resulted in volumetric expansion during the initial stages. Gu et al 23 researched FA-GBFS geopolymer and found that the synergistic effect between mineral polycondensation reactions and calcium silicate hydration reactions determines the mechanical and magnetic properties of this type of geopolymer. Although these studies exploring the microreaction mechanism of geopolymers have provided us with a large amount of theoretical data, the experiments are difficult to provide more detailed reaction information at the nanometre level due to the limitation of equipment conditions and the microreaction mechanism is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation of the initial stage induction of alkali-activated aluminosilicate minerals

Guo,

Chen,

Tang

et al. 2024

RSC Adv.

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“…Under the impact of alkali activation, part of the Si-O bonds with Al-O bonds in vitreous FA and GBFS break and condense into a three-dimensional mesh structure with a high degree of polymerization [24][25][26], which is an inorganic low-carbon non-metallic binding material. Not only is geopolymer more economical than ordinary Portland cement, but it also offers superior mechanical properties [27]. As a result, geopolymer is an effective way to improve PG s poor water stability and cure its heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting the Strength Formation Mechanism and Water Stability of Geopolymer Stabilized Phosphogypsum in Road Construction

Wu,

Zhang,

Lin

et al. 2023

Coatings

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By adjusting the content of geopolymer in geopolymer stabilized phosphogypsum (GSP) as roadbed filler, along with the mixing ratio, this paper mainly explores tendencies in the mechanical properties and water stability of GSP. This research is based on macro-mechanical properties such as unconfined compressive strength, resilience modulus, California bearing ratio and shear strength. It is also based on water stability tests, such as the water soaking test, dry and wet cycle test and expansion test, to explore changes in water stability. As for the durability of GSP, this paper is mainly based on the realization of a long time observation of mechanical properties and water stability. In the existing research, most of the stabilized phosphogypsum (PG) base material or roadbed filler consists of cement, lime, etc. In this paper, a new exploration is carried out on the composition of stabilized PG material, realized without the participation of cement. The 28 d compressive strength of GSP reaches 2.5 MPa, and over time this strength grows, which prevents the phenomenon of strength inversion that may occur in conventional cement-stabilized PG. In addition, a long-term soaking experiment was designed in this study based on the material after the strength was stabilized for up to 90 d. After the strength was steady, the GSP with the best water stability still had a softening coefficient of 80% after experiencing water immersion for 7 d. After determining the feasibility of the mechanical properties and water stability of GSP as roadbed filler, we further explored the strength formation mechanism of GSP by microscopic tests (XRD and SEM). This shows that geopolymer can stabilize PG in two main ways: one is the hydration reaction with PG to generate C-S-H gel and ettringite, and the other is to connect PG not involved in the chemical reaction to form a dense whole through generated hydration products. Geopolymer, stabilizing a high amount of PG, not only provides a new method for the consumption of PG, but also has more stable performance than cement, and has certain advantages in economy. In addition, the advantage of this study is that good performance can be achieved by simply sieving PG and adjusting the geopolymer ratio in practical engineering projects.

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Electromagnetic and mechanical properties of FA-GBFS geopolymer composite used for induction heating of airport pavement

Cited by 34 publications

References 51 publications

Review on Geopolymers as Wellbore Sealants: State of the Art Optimization for CO₂ Exposure and Perspectives

Review on Geopolymers as Wellbore Sealants: State of the Art Optimization for CO₂ Exposure and Perspectives

Molecular dynamics simulation of the initial stage induction of alkali-activated aluminosilicate minerals

Factors Affecting the Strength Formation Mechanism and Water Stability of Geopolymer Stabilized Phosphogypsum in Road Construction

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Electromagnetic and mechanical properties of FA-GBFS geopolymer composite used for induction heating of airport pavement

Cited by 34 publications

References 51 publications

Review on Geopolymers as Wellbore Sealants: State of the Art Optimization for CO2 Exposure and Perspectives

Review on Geopolymers as Wellbore Sealants: State of the Art Optimization for CO2 Exposure and Perspectives

Molecular dynamics simulation of the initial stage induction of alkali-activated aluminosilicate minerals

Factors Affecting the Strength Formation Mechanism and Water Stability of Geopolymer Stabilized Phosphogypsum in Road Construction

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Product

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Review on Geopolymers as Wellbore Sealants: State of the Art Optimization for CO₂ Exposure and Perspectives

Review on Geopolymers as Wellbore Sealants: State of the Art Optimization for CO₂ Exposure and Perspectives