A Review of Current Research on the Use of Geopolymer Recycled Aggregate Concrete for Structural Members

Ahmed, Muhammad; Colajanni, Piero; Pagnotta, Salvatore

doi:10.3390/ma15248911

Cited by 6 publications

(4 citation statements)

References 44 publications

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“…Furthermore, in [30], it was also shown that-due to the presence of both natural fibers-the failure mode of the composite changes from a brittle to more ductile one and that the post-peak behavior is strongly influenced. On the other hand, the role played by geopolymers in the construction industry is confirmed by many papers in which the use of geopolymers as the basis of concrete (with or without recycled aggregates) to be adopted in structural members is investigated [31].…”

Section: Introductionmentioning

confidence: 94%

Experimental Analysis and Numerical Modelling of the Mechanical Behavior of a Sisal-Fiber-Reinforced Geopolymer

Benfratello,

Cirello,

Palizzolo

et al. 2024

Applied Sciences

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The present paper is devoted to the proposal of appropriate numerical modelling able to provide a suitable description of the mechanical behavior of a composite geopolymer. Reference is made to a natural sisal-fiber-reinforced geopolymer. The study is based on the results of appropriate experimental investigations for compressive, flexural and splitting loadings, taking into account different weight percentages of fibers to evidence their role in the mechanical behavior. The main objective of the paper is to calibrate the microplane constitutive model, available in ANSYS software version 18.1, where the numerical analyses are performed. Therefore, the present study is structured in two different steps. Firstly, the mechanical behavior of geopolymers reinforced with sisal fibers is experimentally investigated, and subsequently, the gathered test data are interpreted and utilized to calibrate the relevant constitutive model to be used in the numerical stage. The obtained results are compared with experimental data, yielding good correlations. The paper’s results supply the parameters required to obtain an affordable numerical model of the reinforced geopolymer for different percentages of fibers to be adopted for material design with assigned mechanical properties.

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Section: Introductionmentioning

confidence: 94%

Experimental Analysis and Numerical Modelling of the Mechanical Behavior of a Sisal-Fiber-Reinforced Geopolymer

Benfratello,

Cirello,

Palizzolo

et al. 2024

Applied Sciences

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“…In developing the research program, the elimination of Portland cement, previously the main component of concrete, was a priority. Studies have shown that producing one ton of cement releases 0.9 tons of CO 2 , accounting for 5% to 7% of global CO 2 emissions [1][2][3]. Many studies have shown that geopolymer concrete is an alternative to cement-based concrete, and its synthesis is a process that consumes half the energy required for Portland cement production and releases 80% less carbon dioxide [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Use of Alkaline-Activated Energy Waste Raw Materials in Geopolymer Concrete

Nalewajko,

Bołtryk

2024

Materials

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Silica fly ash, Certyd aggregate, and an alkaline solution were used to produce lightweight geopolymer concretes. The compressive strength, water absorption, and bulk density results, along with SEM photos showing the structure of the obtained composite, were obtained. Tests conducted on the specifications of lightweight geopolymer concretes have revealed significant chemical interactions between the ash aggregate and the geopolymer mortar, particularly when the coarse aggregate surface has been pre-treated with an alkaline solution. A statistical analysis of the experimental data, which investigated the influence of three key variables on the compressive strength, water absorption, and bulk density of lightweight geopolymer concrete (LBG), identified the following factors as having the most substantial impact: the quantity of alkali used, the curing temperature, and the concentration of alkali in the mixture. The optimal test series exhibited a commendable compressive strength of 20.14 megapascals (MPa), accompanied by a water absorption rate of 14.72%, and a bulk density of 1486.6 kg per cubic meter (kg/m³). These findings underscore the importance of alkali content, curing temperature, and alkali concentration in tailoring the properties of lightweight geopolymer concrete to meet specific performance requirements.

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“…In developing the research program, the elimination of Portland cement, previously the main component of concrete, was a priority. Studies have shown that producing one ton of cement releases 0.9 tons of CO2, accounting for 5% to 7% of global CO2 emissions [4,14,19]. Many studies have shown that geopolymer concrete is an alternative to cement-based concrete, and its synthesis is a process that consumes half the energy required for Portland cement production and releases 80% less carbon dioxide [3,11,13,23].…”

Section: Introductionmentioning

confidence: 99%

Use of Alkaline-Activated Energy Waste Raw Materials in Geopolymer Concrete

Nalewajko,

Bołtryk

2024

Preprint

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Silica fly ash, Certyd aggregate, and an alkaline solution were used to produce lightweight geo-polymer concretes. The compressive strength, water absorption, bulk density and SEM photos showing the structure of the obtained composite were carried out. Tests conducted on the specifi-cation of lightweight geopolymer concretes have revealed significant chemical interactions between the ash aggregate and the geopolymer mortar, particularly when the coarse aggregate surface has been pre-treated with an alkaline solution. Statistical analysis of the experimental data, which in-vestigated the influence of three key variables on compressive strength, water absorption, and bulk density of Lightweight Geopolymer Concrete (LBG), identified the following factors as having the most substantial impact: the quantity of alkali used, the curing temperature, and the concentration of alkali in the mixture. The optimal test series exhibited a commendable compressive strength of 20.14 megapascals (MPa), accompanied by a water absorption rate of 14.72% and a bulk density of 1486.6 kilograms per cubic meter (kg/m³). These findings underscore the importance of alkali con-tent, curing temperature, and alkali concentration in tailoring the properties of lightweight geo-polymer concrete to meet specific performance requirements.

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A Review of Current Research on the Use of Geopolymer Recycled Aggregate Concrete for Structural Members

Cited by 6 publications

References 44 publications

Experimental Analysis and Numerical Modelling of the Mechanical Behavior of a Sisal-Fiber-Reinforced Geopolymer

Experimental Analysis and Numerical Modelling of the Mechanical Behavior of a Sisal-Fiber-Reinforced Geopolymer

Use of Alkaline-Activated Energy Waste Raw Materials in Geopolymer Concrete

Use of Alkaline-Activated Energy Waste Raw Materials in Geopolymer Concrete

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