Thermal Properties of Geopolymers

Vickers, Les; Riessen, Arie van

doi:10.1007/978-981-287-311-8_5

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…This is probably due to the higher concentrations of Si ions resulting from high‐alkaline solution hinders aggregation of pores during polycondensation, leaving more small pores distributed evenly during geopolymeric reaction . Vickers et al indicated the higher content of small pores (less pore interconnectivity) is beneficial to decreasing thermal conductivity and increasing strength of the material.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of fly ash/metakaolin geopolymer for concrete retrofitting application

Ding

Chang

Lee

et al. 2018

Structural Concrete

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The purpose of this research is to use fly ash as raw material to synthesize geopolymer paste that can replace traditional epoxy resin for concrete reinforcement purpose. Fly ash and metakaolin are mixed with alkali solution at predetermined SiO2/Na2O modulus to form geopolymer pastes, which were then used as a binding agent between carbon fiber reinforced polymer (CFRP) and the concrete substrate. According to the test results, the geopolymer paste synthesized with 0.75 SiO2/Na2O modulus alkali activator have the highest mechanical strength and fire resistance. Under ambient condition, the compressive strength of the concrete cylinder bonded to one layer and two layers CFRP using geopolymers binder is 1.5 times and 2 times of original concrete cylinder, respectively. Under 85% compressive strength loading and elevated temperature, the CFRP (geopolymer) bonded concrete cylinder failed at 516 °C. These test results proved that geopolymer can be a potential binding material for concrete rehabilitation due to its high‐mechanical strength and excellent fire resistance.

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Section: Resultsmentioning

confidence: 99%

Synthesis of fly ash/metakaolin geopolymer for concrete retrofitting application

Ding

Chang

Lee

et al. 2018

Structural Concrete

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“…The amount of free and bound water has a significant impact on the dehydration. Thermogravimetric analysis (TGA) and magnetic resonance (NMR) of samples made of geopolymer showed that the majority of water is bound physically rather than chemically, as reported by Vickers et al [ 18 ]. When the temperature rises, the water is released and shrinkage develops, pores shrink, and solid components, e.g., aggregates, expand.…”

Section: Introductionmentioning

confidence: 85%

“…Binder type and amount [56], gradation, shape, and amount of coarse aggregate [102], water to binder ratio [18,192,193], amount and type of additives [97].…”

Section: Compositionmentioning

confidence: 99%

Eco-Concrete in High Temperatures

Sundin¹,

Hedlund²,

Ćwirzeń³

2023

Materials

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Concrete technology is becoming more and more sustainable and ecological following more extensive and focused research. The usage of industrial waste and by-products, such as steel ground granulated blast-furnace slag (GGBFS), mine tailing, fly ash, and recycled fibers, is a very important step toward a good transition of concrete into a “green” future and significant improvement in waste management in the world. However, there are also several known durability-related problems with some types of eco-concretes, including exposure to fire. The general mechanism occurring in fire and high-temperature scenarios is broadly known. There are many variables that weightily influence the performance of this material. This literature review has gathered information and results regarding more sustainable and fire-resistant binders, fire-resistant aggregates, and testing methods. Mixes that utilize industrial waste as a total or partial cement replacement have been consistently achieving favorable and frequently superior outcomes when compared to conventional ordinary Portland cement (OPC)-based mixes, especially at a temperature exposure up to 400 °C. However, the primary emphasis is placed on examining the impact of the matrix components, with less attention given to other factors such as sample treatment during and following exposure to high temperatures. Furthermore, there is a shortage of established standards that could be utilized in small-scale testing.

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