Influence of Activators on Mechanical Properties of Modified Fly Ash Based Geopolymer Mortars

Prochoń, Piotr; Zhao, Zengfeng; Courard, Luc; Piotrowski, Tomasz; Michel, Frédéric; Garbacz, Andrzej

doi:10.3390/ma13051033

Cited by 34 publications

(18 citation statements)

References 72 publications

(84 reference statements)

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“…The highest compressive strength values were achieved for the samples MK5/MH5. This is in line with the literature data [21], which indicates that the higher the silicon content in the activator, the higher the strength parameters. It is related to the content of the amorphous phase, that is, the higher the glassy content, the more visually homogenous gel structure (Figures 4 and 5), which have possibly contributed to its high strength after the activation.…”

Section: Characterization Of Alkali-activated Clayssupporting

confidence: 93%

Alkaline Activation of Kaolin Group Minerals

et al. 2020

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Zeolites can be obtained in the process of the alkali-activation of aluminosilicate precursors. Such zeolite–geopolymer hybrid bulk materials merge the advantageous properties of both zeolites and geopolymers. In the present study, the effect of the type and concentration of an activator on the structure and properties of alkali-activated metakaolin, and metahalloysite was assessed. These two different kaolinite clays were obtained by the calcination of kaolin and halloysite, and then activated with sodium hydroxide and water glass. The phase compositions were assessed by X-ray diffraction, the microstructure was observed via scanning electron microscope, and the structural studies were conducted on the basis of the infrared spectra. The structure and properties of the obtained alkali-activated materials depend on both the type of a precursor and the type of an activator. The formation of zeolite phases was observed when the activation was carried out with sodium hydroxide alone, or with a small addition of water glass, regardless of the starting material used. The higher proportion of silicon in the activator solution does not give crystalline phases, but only an amorphous phase. Geopolymers based on metahalloysite have better compressive strength as the result of the better reactivity of metahalloysite compared to metakaolin.

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Section: Characterization Of Alkali-activated Clayssupporting

confidence: 93%

Alkaline Activation of Kaolin Group Minerals

et al. 2020

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“…The Derivative Thermogravimetry (DTG) curves in Fig. 7 The TG curve remains steady after 650°C due to the swelling of the high silicate secondary phases [29]. The DTA curves reveal the transformation of amorphous aluminum phosphate phase into crystal phases (e.g.…”

Section: Tg-dta Resultsmentioning

confidence: 97%

Comparative Analysis Between Fly Ash Geopolymer and Reactive Ultra-Fine Fly Ash Geopolymer

Lin

Korniejenko

et al. 2021

Int. j. eng. technol. innov.

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This study investigates novel geopolymers by combining Reactive Ultra-fine Fly Ash (RUFA) with 4M sodium hydroxide as an alkali activator. Comparing with general fly ash geopolymers, RUFA geopolymer pastes are characterized in terms of compressive strength, microstructure, and crystalline phases. The RUFA geopolymer is successfully obtained as alumina-silicate bonding materials with the same properties as the general fly ash-based geopolymer. The high compressive strength of the RUFA-based geopolymer samples (13.33 MPa) can be attributed primarily to Ca-based alumino-silicate hydration products and Na-based alumino-silicate complexes. This research presents an innovative application for geopolymers using RUFA. In the follow-up study, the influence of synthesis and concentration of alkali activator can be considered in RUFA-based geopolymers.

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“…Fly-ash based geopolymer concretes have been synthesised from different power stations, resulting in substantially different particle size, morphology, and composition due to the different coal powders and combustion conditions in those plants [ 2 , 30 , 33 , 34 , 35 , 36 , 37 , 38 ]. Fly-ash is excellent for improving early strength and durability, rendering it suitable as the primary source materials in the synthesis of geopolymer concrete [ 2 , 33 , 36 , 37 , 38 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

Properties of a New Insulation Material Glass Bubble in Geopolymer Concrete

et al. 2021

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This paper details analytical research results into a novel geopolymer concrete embedded with glass bubble as its thermal insulating material, fly ash as its precursor material, and a combination of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) as its alkaline activator to form a geopolymer system. The workability, density, compressive strength (per curing days), and water absorption of the sample loaded at 10% glass bubble (loading level determined to satisfy the minimum strength requirement of a load-bearing structure) were 70 mm, 2165 kg/m3, 52.58 MPa (28 days), 54.92 MPa (60 days), and 65.25 MPa (90 days), and 3.73 %, respectively. The thermal conductivity for geopolymer concrete decreased from 1.47 to 1.19 W/mK, while the thermal diffusivity decreased from 1.88 to 1.02 mm2/s due to increased specific heat from 0.96 to 1.73 MJ/m3K. The improved physicomechanical and thermal (insulating) properties resulting from embedding a glass bubble as an insulating material into geopolymer concrete resulted in a viable composite for use in the construction industry.

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Influence of Activators on Mechanical Properties of Modified Fly Ash Based Geopolymer Mortars

Cited by 34 publications

References 72 publications

Alkaline Activation of Kaolin Group Minerals

Alkaline Activation of Kaolin Group Minerals

Comparative Analysis Between Fly Ash Geopolymer and Reactive Ultra-Fine Fly Ash Geopolymer

Properties of a New Insulation Material Glass Bubble in Geopolymer Concrete

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