Review of Dolomite as Precursor of Geopolymer Materials

Azimi, Emy Aizat; Yun-Ming, Liew; Cheng-Yong, Heah; Kamarudin, Hussin; Aziz, Ikmal Hakem

doi:10.1051/matecconf/20167801090

Cited by 31 publications

(4 citation statements)

References 35 publications

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“…Furthermore, vermiculite in MT, dolomite in FA and mullite in PF were absent in the mineralogy after geopolymerization. Vermiculite is known to transform to a phyllosilicate mica structure type in basic condition ( Medri et al., 2015 ) while dolomite is known to dissolve during alkali activation regardless of the concentration of the activators ( Azimi et al., 2016 ). This indicates their participation during polymerization and polycondensation.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of coal fly ash and palm oil fuel ash modified artisanal and small-scale gold mine (ASGM) tailings based geopolymer using sugar mill lime sludge as Ca-based activator

Opiso

Tabelin

Maestre

et al. 2021

Heliyon

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The continuous accumulation of artisanal and small-scale gold mining (ASGM) tailings in the Philippines without adequate storage and disposal facility could lead to human health and environmental disasters in the long run. In this study, ASGM tailings was simultaneously stabilized and repurposed as construction material via geopolymerization using coal fly ash, palm oil fuel ash and a powder-based alkali activator. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) identified iron sulfides in the tailings containing arsenic (As), cadmium (Cd), copper (Cu), lead (Pb) and zinc (Zn), which could be released via weathering. The average unconfined compressive strengths (UCS) of tailings-based geopolymers at 14 days curing were 7.58 MPa and 7.7 MPa with fly ash and palm oil fuel ash, respectively. The tailings-based geopolymers with palm oil fuel ash had higher UCS most likely due to CASH reaction product formation that improved strength formation. The toxicity characteristic leaching procedure (TCLP) results showed very low leachabilities of As, Pb and Fe in the geopolymer materials suggesting ASGM tailings was effectively encapsulated within the geopolymer matrix. Overall, the geopolymerization of ASGM tailings is a viable and promising solution to simultaneously stabilize mining and industrial wastes and repurpose them into construction materials.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of coal fly ash and palm oil fuel ash modified artisanal and small-scale gold mine (ASGM) tailings based geopolymer using sugar mill lime sludge as Ca-based activator

Opiso

Tabelin

Maestre

et al. 2021

Heliyon

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“…Dolomite is a primary sediment mineral and is widely distributed geologically. Calcium carbonate minerals, such as dolomite are also usually applied to geopolymers to improve the mechanical properties of geopolymers [ 8 ]. Coppola et al, [ 9 ] investigated the role of composition and processing of carbonate-containing alkali activated materials, such as granite, albite, diatomite combines with metakaolin and fly ash.…”

Section: Introductionmentioning

confidence: 99%

Chemical Distributions of Different Sodium Hydroxide Molarities on Fly Ash/Dolomite-Based Geopolymer

et al. 2022

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Geopolymers are an inorganic material in an alkaline environment that is synthesized with alumina–silica gel. The structure of geopolymers consists of an inorganic chain of material and a covalent-bound molecular system. Currently, Ordinary Portland Cement (OPC) has caused carbon dioxide (CO2) emissions which causes greenhouse effects. This analysis investigates the impact on fly ash/dolomite-based-geopolymer with various molarities of sodium hydroxide solutions which are 6 M, 8 M, 10 M, 12 M and 14 M. The samples of fly ash/dolomite-based-geopolymer were prepared with the usage of solid to liquid of 2.0, by mass and alkaline activator ratio of 2.5, by mass. After that, the geopolymer was cast in 50 × 50 × 50 mm molds before testing after 7 days of curing. The samples were tested on compressive strength, density, water absorption, morphology, elemental distributions and phase analysis. From the results, the usage of 8 M of NaOH gave the optimum properties for the fly ash/dolomite-based geopolymer. The elemental distribution analysis exposes the Al, Si, Ca, Fe and Mg chemical distribution of the samples from the selected area. The distribution of the elements is related to the compressive strength and compared with the chemical composition of the fly ash and dolomite.

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“…Geopolymers exhibit a nanoporous matrix gel as reported in Figure 1 [8,[12][13][14]. This porous matrix assists in increasing the surface area and the physicochemical adsorption of micropollutants.…”

Section: Geopolymers For Construction and Water Treatmentmentioning

confidence: 97%

Introductory Chapter: Case Studies of Functional Geopolymers

Alshaaer¹

2020

Geopolymers and Other Geosynthetics

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Review of Dolomite as Precursor of Geopolymer Materials

Cited by 31 publications

References 35 publications

Synthesis and characterization of coal fly ash and palm oil fuel ash modified artisanal and small-scale gold mine (ASGM) tailings based geopolymer using sugar mill lime sludge as Ca-based activator

Synthesis and characterization of coal fly ash and palm oil fuel ash modified artisanal and small-scale gold mine (ASGM) tailings based geopolymer using sugar mill lime sludge as Ca-based activator

Chemical Distributions of Different Sodium Hydroxide Molarities on Fly Ash/Dolomite-Based Geopolymer

Introductory Chapter: Case Studies of Functional Geopolymers

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