Physical nonlinearity of precast reinforced geopolymer concrete beams

Pires, Eliane Fernandes Côrtes; Lima, Thiago V.; Marinho, F.; Vargas, Alexandre Silva de; Mounzer, Elie Chahdan; Darwish, Fathi Aref; Silva, Felipe J.

doi:10.1016/j.jmrt.2019.01.016

“…To manufacture adequate and stable geopolymer, the source materials must be highly reactive, easy to release aluminum, and have moderate water consumption [15][16][17][18][19][20][21][22]. Many materials can be used as alkali activators such as Sodium Hydroxide (NaOH), Potassium Silicate (K2SiO3), Sodium Silicate (Na2SiO3), and Potassium Hydroxide (KOH) [23][24][25][26][27][28][29][30] Since the geopolymer hardened matrix has good mechanical strength, stiffness, and durability properties [30][31][32][33][34], geopolymer concrete can be reinforced to play the same role of conventional…”

Section: Introductionmentioning

confidence: 99%

Structural Behavior of Geopolymer Reinforced Concrete Beams: A Short Review

Saeed

¹

,

Amli

²

2023

jeasd

0

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The significant CO2 emissions that can be associated with cement manufacture is the primary cause of global warming. Thus, the authors and research groups are motivated by many factors to find long-term solutions to this problem. Geopolymer concrete is such type of concrete in which the primary binder has resulted from alkali activation of some source materials like fly ash, metakaoline, rice husk ash, and ground granulated blast furnace slag. Commonly, geopolymer concrete gives comparable mechanical strength properties to conventional concrete. The use of this type of concrete is restricted by the properties of the used source materials and the molar concentrations of the alkali activator. As a consequence, making investigations into the relevant structural behavior as a result of these variables are rich source of scientific research. The goal of this work is to provide a brief overview of the recent contributions that have dealt with the structural behavior of geopolymer concrete. The context of this paper was obtained to illustrate the main findings as well as the used source materials and some additional considerations.

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“…In Brazil, the mechanical performance of precast beams of reinforced geopolymer concrete (CCG) and the comparison with their duplicates of reinforced Portland cement concrete (CCP) was done, and it was found that the effect of reinforcement ratio on precast CCG beams is approximately identical with typical precast CCP beams in regards to flexural capacity and ductility. The extreme load-carrying capacity of CCG precast beams was slightly higher when compared to CCP precast beams [11]. To produce geopolymer earth brick (GPEB), strength development for various grades of geopolymer mortar was done with varying molarity.…”

Section: Introductionmentioning

confidence: 99%

Development and Mechanical Testing of Porous-Lightweight Geopolymer Mortar

Qadir

¹

,

Rashid

²

,

Hassan

³

et al. 2020

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In this study, a novel porous geopolymer mortar (GP) was produced and tested experimentally. Industrial waste materials/by-products were used as constituents of the GP, along with dune sand. One sample was produced as a control sample for benchmarking. For the rest of the samples, 15%, 30%, and 45% by volume, the solid constituents were replaced with expanded polystyrene foam (EPS) beads. These mortar samples were heat cured to depolymerize the EPS to cause porosity inside the samples. Indoor experiments were conducted to evaluate the response of produced porous GP to high heat flux. The porous samples were able to reduce heat transmission across the opposite surfaces. Induced porosity resulted in a decrement in compressive strength from 77.2 MPa for the control sample to 15.8 MPa for 45% porous sample. However, the limit lies within the standards for partitioning walls in buildings and pavements in urban areas to absorb rainwater.

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“…In Brazil, the mechanical performance of precast beams of reinforced geopolymer concrete (CCG) and the comparison with their duplicates of reinforced Portland cement concrete (CCP) was done, and it was found that the effect of reinforcement ratio on precast CCG beams is approximately identical with typical precast CCP beams in regards to flexural capacity and ductility. The extreme load-carrying capacity of CCG precast beams was slightly higher when compared to CCP precast beams [9]. To produce geopolymer earth brick (GPEB), strength development for various grades of geopolymer mortar was done with varying molarity.…”

Section: Introductionmentioning

confidence: 99%

Development and Mechanical Testing of Porous-Lightweight Geopolymer Mortar

Qadir¹,

Rashid²,

Ahmad³

et al. 2020

Preprint

1

0

View full text Add to dashboard Cite

In this study, a novel porous geopolymer mortar (GP) was produced and tested experimentally. Industrial waste materials/by-products were used as constituents of the GP, along with dune sand. One sample was produced as a control sample for benchmarking. For the rest of the samples, 15%, 30%, and 45% by volume, the solid constituents were replaced with expanded polystyrene foam (EPS) beads. These mortar samples were heat cured to depolymerize the EPS to cause porosity inside the samples. Indoor experiments were conducted to evaluate the response of produced porous GP to high heat flux. The porous samples were able to reduce heat transmission across the opposite surfaces. Induced porosity resulted in a decrement in compressive strength from 77.2 MPa for the control sample to 15.8 MPa for 45% porous sample. However, the limit lies within the standards for partitioning walls in buildings and pavements in urban areas to absorb rainwater.

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Physical nonlinearity of precast reinforced geopolymer concrete beams

Cited by 8 publications

References 9 publications

Structural Behavior of Geopolymer Reinforced Concrete Beams: A Short Review

Structural Behavior of Geopolymer Reinforced Concrete Beams: A Short Review

Development and Mechanical Testing of Porous-Lightweight Geopolymer Mortar

Development and Mechanical Testing of Porous-Lightweight Geopolymer Mortar

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