Effects of metakaolin addition on geopolymer prepared from natural kaolinitic clay

Selmani, Samira; Sdiri, Ali; Bouaziz, Samir; Joussein, Emmanuel; Rossignol, Sylvie

doi:10.1016/j.clay.2017.06.019

Cited by 52 publications

(26 citation statements)

References 26 publications

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“…The paint and paper industries utilize the color and plate-like morphology (Figure 1) of the metakaolin in coating applications [9], while ceramics benefit from metakaolin's pozzolanic activity [10]. Today, the literature is abundant with the benefits of using metakaolin as a SCM in concrete mixtures.…”

Section: Introductionmentioning

confidence: 99%

“…Today, the literature is abundant with the benefits of using metakaolin as a SCM in concrete mixtures. Furthermore, the production of metakaolin, compared to Portland cement, requires much lower calcining temperature and emits less CO2 than Portland cement [10]. Metakaolin is an aluminous and siliceous natural pozzolan that conforms to ASTM C618, and is the product of thermally or mechanically activating kaolin clay.…”

Section: Introductionmentioning

confidence: 99%

“…Today, the literature is abundant with the benefits of using metakaolin as a SCM in concrete mixtures. Furthermore, the production of metakaolin, compared to Portland cement, requires much lower calcining temperature and emits less CO 2 than Portland cement [10]. cement produced approximately 0.82 tons of carbon dioxide are released into the atmosphere [3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sustainable Materials for Transportation Infrastructures: Comparison of Three Commercially-Available Metakaolin Products in Binary Cementitious Systems

et al. 2018

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Abstract:Metakaolin is the only major natural pozzolan to be specified for use as a supplementary cementitious material in the United States. As a result, the metakaolin market for concrete has grown dramatically in the past 20 years. As of now, the specifications of up to 16 state departments of transportation allow for the use of commercially-available and high-reactivity metakaolin products. However, to the best of the authors' knowledge, no study has been performed to evaluate whether these products are comparable in their performance. Three commercially-available (U.S.) metakaolin products, each replacing 10%, 15%, and 20% of the cement content in concrete and mortar mixtures are studied. Concrete mixtures contained a cementitious content of 422 kg/m 3 , a coarse aggregate fraction of 985 kg/m 3 , and a water-to-cementitious ratio equal to 0.43. Varying levels of a superplasticizer were used to maintain a uniform workability between mixtures. Each mixture was subjected to the following tests: compression, split-cylinder tension, modulus of rupture, dynamic elastic modulus, rapid chloride-ion penetrability, alkali-silica reactivity, sulfate resistance, the coefficient of thermal expansion, and drying shrinkage. Benefits from the inclusion of metakaolin were highly product-dependent and include increases in mechanical strength. All metakaolin supplemented concrete mixtures benefitted from decreased permeability and increased resistance to chemical attacks, with the exception of the sulfate resistance of mortars including a metakaolin product with high fineness. The inclusion of any metakaolin at any replacement level increased the coefficient of thermal expansion of concrete specimens. Reasons for difference in performance between products are discussed, and predictors of quality are recommended.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Today, the literature is abundant with the benefits of using metakaolin as a SCM in concrete mixtures. Furthermore, the production of metakaolin, compared to Portland cement, requires much lower calcining temperature and emits less CO 2 than Portland cement [10]. cement produced approximately 0.82 tons of carbon dioxide are released into the atmosphere [3].…”

Section: Introductionmentioning

confidence: 99%

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Sustainable Materials for Transportation Infrastructures: Comparison of Three Commercially-Available Metakaolin Products in Binary Cementitious Systems

et al. 2018

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“…Additionally, the dimensional changes presented about 1% linear shrinkage. This observed effect is well known and is associated with the removal of absorbed water and water contained within the pore network [47][48][49]. Moreover, the sample size expansion recorded on the dilatometric curve ( Figure 17) in the temperature ranged from 300 • C to 600 • C can be attributed to a dehydroxylation process and the polymorphic α-β transition of an unreacted quartz phase or glass transition in the geopolymer matrix [50].…”

Section: Thermal Analysis Of the Geopolymer Synthesized At Optimum Comentioning

confidence: 70%

Alkali Activation of Waste Clay Bricks: Influence of The Silica Modulus, SiO2/Na2O, H2O/Na2O Molar Ratio, and Liquid/Solid Ratio

Gado¹,

Hebda

Łach

et al. 2020

Materials

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This study was conducted to investigate the influence of various reaction conditions, namely the silica modulus SiO2/Na2O, H2O/Na2O molar ratio, and liquid/solid ratio on the geopolymerization reaction of the waste fired clay bricks (Grog). The starting raw material and the generated geopolymer specimens produced by different geopolymerization reaction conditions have been characterized using different techniques: X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and thermal analysis. Furthermore, physico–mechanical characterization has been carried out through the determination of bulk density, porosity, water absorption, and compressive strength for each sample at interval curing times of up to 28 days. The results indicated that the geopolymerization system of the waste fired clay bricks is influenced by the investigated reaction conditions at room temperature. The compressive strength of the geopolymer sample produced at optimum conditions increased significantly by up to 37.5 MPa, in comparison with 4.5 MPa for other conditions. Finally, an optimum recommendation and useful conclusions concerning the recycling and utilization of this waste material through the geopolymerization process are made for compatibility with construction applications.

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“…Due to the clinkerization process, CO 2 emissions generated by cement production are around 800 kg/ton cement (HASANBEIGI; PRICE; LIN, 2012; HILLS; FLORIN; FENNELL, 2016). Extensive researches focus on the reduction of the CO 2 footprint of construction materials, such as the development of supplementary cementitious materials (LOTHENBACH; SCRIVENER; HOOTON, 2011), belitic binders (ÁVALOS-RENDÓN et al, 2018;SINYOUNG et al, 2017) and geopolymers (SELMANI et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Application of Graphene Oxide in Cementitious Composites for Cement Content Reduction

Salvador

Bueno

Rambo

et al. 2018

JUTS

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Cement production is responsible for 5% of CO2 emissions worldwide. The concern about the pollution derived from the construction industry has brought attention to the need of developing more sustainable construction materials and processes. Admixtures based on nanometric graphene oxide have the potential to enhance mechanical properties and durability of cementitious composites. In this context, an experimental program was conducted to evaluate how the addition of graphene oxide may be used to reduce cement content in concretes, maintaining the same mechanical properties of conventional concretes (control matrices, with no graphene oxide additions). Kinetics of hydration of cement pastes was evaluated by isothermal calorimetry, phase evolution during hydration was determined by X-ray diffraction coupled with quantitative Rietveld analysis and mechanical properties were evaluated by compressive strength. Results indicate that graphene oxide additions provide a faster hydration rate until 24 h and generate a larger amount of C-S-H gel, increasing mechanical strength of the matrix. By the addition of graphene oxide dispersion (0.4% of solid content) at 0.02% by cement weight, cement content reductions of up to 15% may be achieved, maintaining the same compressive strength as the control matrices. From this research, a reduction in cement content to obtain more sustainable construction materials and processes may be achieved.

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Effects of metakaolin addition on geopolymer prepared from natural kaolinitic clay

Cited by 52 publications

References 26 publications

Sustainable Materials for Transportation Infrastructures: Comparison of Three Commercially-Available Metakaolin Products in Binary Cementitious Systems

Sustainable Materials for Transportation Infrastructures: Comparison of Three Commercially-Available Metakaolin Products in Binary Cementitious Systems

Alkali Activation of Waste Clay Bricks: Influence of The Silica Modulus, SiO2/Na2O, H2O/Na2O Molar Ratio, and Liquid/Solid Ratio

Application of Graphene Oxide in Cementitious Composites for Cement Content Reduction

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