Structural analysis of composite metakaolin-based geopolymer concrete

Pelisser, Fernando; Silva, Bruno do Vale; Menger, M.; Frasson, Bruna Juvêncio; Keller, Thomas; Torii, André Jacomel; López, Rosalía Rodríguez

doi:10.1590/s1983-41952018000300006

Cited by 18 publications

(7 citation statements)

References 26 publications

(39 reference statements)

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“…The observations on the fact that the bonding behavior of GPC is similar to that of CVC. 54,55 Like CVC, GPC is a nonlinear material with properties that change with time and pressure. Thus, the nonlinear behavior was mimicked using the Drucker-Prager model 56 combined with William-Warnke 57 plasticity surface in the study.…”

Section: Resultsmentioning

confidence: 99%

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Compressive stress–strain model for the estimation of the flexural capacity of reinforced geopolymer concrete members

Kocaer

Aldemir

2022

Structural Concrete

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Global warming triggered efforts on sustainable materials in any area of production. Thus, the construction materials were also at the edge of a sharp change to achieve less harm to the environment by reducing the carbon print. Consequently, researchers have been trying to replace the cement from the mixtures of reinforced concrete as cement production causes large amounts of carbon dioxide emissions. Alkali‐activated binders are proved to be versatile alternatives to cementitious binders; however, accurate mathematical models to predict the capacities of these structural elements are limited in number. Therefore, in this study, a new stress–strain model has been developed to estimate the flexural capacity of geopolymer structural elements originated from construction and demolition waste. The study was initiated by formulating a novel stress–strain model applicable for defining the compressive behavior of geopolymer concrete. The formulation was based on recent experimental findings on flexural behavior of geopolymer beam specimens. Then, the performance of the proposed stress–strain model in estimating the ultimate moment capacities was investigated by using 36 bending tests from the literature. The results showed that the proposed model had very little deviations and enhanced accuracy compared with the literature available estimation method recommended by the ACI318. In addition, a soft database composed of 50 different beam specimens with varying mechanical properties and reinforcement patterns was formed. Numerical models corresponding to all possible combinations of each parameter were generated, and their load capacities were determined. After that, the estimation performances of the proposed method and the stress–strain models from the literature, and also the ACI318 procedure were examined. The conclusion of this check also yielded promising results with an absolute mean percentage error of 5.13% regardless of the mode of failures.

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Section: Resultsmentioning

confidence: 99%

“…The observations on the fact that the bonding behavior of GPC is similar to that of CVC 54,55 . Like CVC, GPC is a nonlinear material with properties that change with time and pressure.…”

Section: Details On the Numerical Modelmentioning

confidence: 97%

Compressive stress–strain model for the estimation of the flexural capacity of reinforced geopolymer concrete members

Kocaer

Aldemir

2022

Structural Concrete

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“…[1][2][3] Geopolymer is commonly used for infrastructure materials, such as brick or concrete materials. [4][5][6][7] Unlike conventional brick or concrete, which needs cement as a binder to make it hardened, the geopolymer can be hardened without the addition of Portland cement. The cement industry consumes a high amount of heat energy and generates carbon dioxide (CO2), and other harmful gases, such as nitrogen dioxide (NO2), and sulfur dioxide (SO2); therefore, this industry is classified as a non-environmental friendly industry.…”

Section: Introductionmentioning

confidence: 99%

“…The common minerals or waste material used to synthesize geopolymer are kaolin, 4,10,11 clay, 5,12,13 fly-ash, 6,7,14 and slag from a blast furnace. 15,16 These materials contain silicates as the main components, but the mineral composition is usually different.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of the Formation Mechanism of Geopolymer Made from Obsidian Mineral and Its Potential Application as a Slow Release Fertilizer

2020

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Geopolymer is the inorganic polymer commonly made from kaolin, clay, fly ash, or slag. Obsidian mineral is the new candidate material for geopolymer formation. Obsidian is a material that used in ancient eras, but nowadays, this function has been replaced by various metals. Obsidian consists of cristobalite and sodium aluminum silicate. Obsidian was reacted with disodium metasilicate (Na2SiO3) to form a mineral-based geopolymer. An analysis of the formation mechanism through X-ray diffraction and Fourier transform infrared spectroscopy showed that the geopolymer formation from obsidian takes place in two stages. The first stage is the formation of a geopolymer from a reaction among cristobalite, disodium metasilicate, and amorphous aluminum silicates, whereas the second stage is the incorporation of crystalline sodium aluminum silicate into the former geopolymer structure. Geopolymer is usually utilized to form brick or concrete for an infrastructure purpose, but in this research, the geopolymer is proposed to control the release rate of elements from fertilizer. The result of potassium release test shows that the geopolymer has a slow-release property.

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“…Much of the research on these binders focuses on mechanical properties. Pelisser et al [11] compared the mechanical behavior of two beams, one with geopolymer concrete and the other with Portland, with the same strength class (C50). The authors observed superior geopolymer steel-concrete adhesion results, showing the potential in developing this type of concrete.…”

Section: Introductionmentioning

confidence: 99%

Concrete crack repair analysis with metakaolin-based geopolymer cement

Frasson

Pelisser

Silva

2020

Rev. IBRACON Estrut. Mater.

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Among the advances in the use of geopolymer cements is their use as repair materials in concrete structures. The objective of this work was to use a geopolymer cement to repair cracks in concrete specimens, observing its mechanical performance and fracture modes. Cubic test specimens were produced and two types of cracks were evaluated as variables. Cracks were induced by steel sheets during concreting. The geopolymer cement paste and an epoxy adhesive, as reference, were used for the repairs. The results showed a 13% decrease in compressive strength for unrepaired concrete, and 3.7% in concrete repaired with geopolymer. The binder presented mechanical performance similar to that of the epoxy resin regarding crack recovery. In conclusion, repairs made with geopolymer cement are a viable and efficient means of crack recovery.

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Structural analysis of composite metakaolin-based geopolymer concrete

Cited by 18 publications

References 26 publications

Compressive stress–strain model for the estimation of the flexural capacity of reinforced geopolymer concrete members

Compressive stress–strain model for the estimation of the flexural capacity of reinforced geopolymer concrete members

An Analysis of the Formation Mechanism of Geopolymer Made from Obsidian Mineral and Its Potential Application as a Slow Release Fertilizer

Concrete crack repair analysis with metakaolin-based geopolymer cement

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