Phase dissolution and improving properties of completely decomposed granite through alkali fusion method

Dassekpo, Jean-Baptiste Mawulé; Miao, Lixin; Bai, Jing; Gong, Qianyi; Shao, Ning Ning; Dong, Zhijun; Xing, Feng; Ye, Jianqiao

doi:10.1016/j.cemconcomp.2022.104407

Cited by 23 publications

(3 citation statements)

References 49 publications

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“…The M-I is often used to prepare one-part geopolymers. 18 , 38 , 48 − 50 Table 6 summarizes some literature about one-part geopolymer preparation via the M-I. Regardless of whether the alkali content used in the alkali fusion process was higher than that in this study, the compressive strength of the geopolymers was far higher than that in this study.…”

Section: Resultsmentioning

confidence: 62%

Effect of Alkali Fusion Methods on the Preparation of One-Part Geopolymer From Coal Gasification Slag

Chen,

Sasaki,

Tian

et al. 2023

ACS Omega

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This study investigated the one-part geopolymer synthesis by coal gasification slag through a calcination treatment. Two preparation methods, the traditional alkali fusion method (M-I) and the alkali fusion and modification method (M-II), were compared to illustrate the more suitable way for coal gasification slag-based one-part geopolymer (CGS-based geopolymer) synthesis. The reaction products and structure of the geopolymer were tested by XRD, FTIR, TG-DTG, and SEM. The results showed that the compressive strength of geopolymers prepared by M-I was raised as the NaOH amount increased, and the maximum compressive strength of geopolymers was achieved at 8.44 MPa. The low compressive strength suggested that M-I failed to be used for CGS-based geopolymer synthesis. When solid NaOH was selected for one-part geopolymer synthesis by M-II, the geopolymer possessed a compressive strength of 25.52 MPa and exhibited a well-combined and dense matrix. More Si and Al species in F-SH could be released for geopolymerization, and the coal gasification slag additive could be partially dissolved and act as the filler in the geopolymer matrix, which enhanced the geopolymerization degree. The M-II has been proven to be more suitable for preparing CGS-based geopolymers than the M-I.

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Section: Resultsmentioning

confidence: 62%

Effect of Alkali Fusion Methods on the Preparation of One-Part Geopolymer From Coal Gasification Slag

Chen,

Sasaki,

Tian

et al. 2023

ACS Omega

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“…The resulting fused materials are then ground and activated by using an alkali silicate activator. It should be noted that, during this step, geopolymerization does not take place via dissolution but rather through transportation and polycondensation steps. ,, Laboratory assessments of granite as GP precursors show that they provide high reactivities, sufficient strength development, and workable setting times …”

Section: Gp Systemsmentioning

confidence: 99%

“…It should be noted that, during this step, geopolymerization does not take place via dissolution but rather through transportation and polycondensation steps. 30,105,106 Laboratory assessments of granite as GP precursors show that they provide high reactivities, sufficient strength development, and workable setting times. 107 Aplite is a Na-rich, granitic rock with high concentrations of SiO 2 and Al 2 O 3 , which mainly contains alkali-feldspars, quartz, muscovite, oligoclase, and, more rarely, biotite.…”

Section: Gp Systemsmentioning

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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High‐performance geopolymer from brick wastes and metakaolin: Alkali treatment optimization, phase transformation, and property analysis

Moujoud,

Sair,

Ousaleh

et al. 2024

Structural Concrete

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This study presents a cost‐effective and eco‐friendly method to produce aluminosilicate materials using red brick waste (RBW) and metakaolin (MK) as silica and alumina precursors. RBW was subjected to alkaline fusion to increase its dissolution for geopolymerization reaction. Response surface methodology was used to investigate the effect of NaOH concentration and fusion temperature on the leaching of silica and alumina from RBW. The microstructure of the alkali‐fused RBW was analyzed using x‐ray diffraction and Fourier‐transform infrared spectroscopy. Response surface methodology confirmed and revealed that higher NaOH concentration (14 M) and a temperature of 660°C favored solubilized phase development, resulting in 85% and 50% leached silica and alumina, respectively. These optimized parameters were then employed to prepare geopolymer materials with different proportions of alkali‐fused RBW and MK, using NaOH and Na2SiO3 as the alkaline solution. The elaborated geopolymer binders were characterized using various techniques such as x‐ray diffraction (DRX), Fourier‐transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermal conductivity (λ), and fire resistance. The results showed that geopolymers containing 30 wt.% of alkali‐fused RBW exerted good mechanical and thermal insulation properties compared to conventional cement materials. However, excessive RBW addition causes negative effects. In addition, it was found that the blended geopolymers exhibited an increase in heat release rate (HRR), resulting in reduced fire resistance due to the presence of unreacted NaOH. Overall, these findings confirmed the potential sustainable use of RBW to partially replace MK in geopolymer as a material for building construction.

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Phase dissolution and improving properties of completely decomposed granite through alkali fusion method

Cited by 23 publications

References 49 publications

Effect of Alkali Fusion Methods on the Preparation of One-Part Geopolymer From Coal Gasification Slag

Effect of Alkali Fusion Methods on the Preparation of One-Part Geopolymer From Coal Gasification Slag

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

High‐performance geopolymer from brick wastes and metakaolin: Alkali treatment optimization, phase transformation, and property analysis

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Phase dissolution and improving properties of completely decomposed granite through alkali fusion method

Cited by 23 publications

References 49 publications

Effect of Alkali Fusion Methods on the Preparation of One-Part Geopolymer From Coal Gasification Slag

Effect of Alkali Fusion Methods on the Preparation of One-Part Geopolymer From Coal Gasification Slag

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

High‐performance geopolymer from brick wastes and metakaolin: Alkali treatment optimization, phase transformation, and property analysis

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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