Comparative Thermal and Mechanical Performance of Geopolymers derived from Metakaolin and Fly Ash

Zhang, Hai Yan; Kodur, Venkatesh; Wu, Bo; Cao, Liang; Qi, Shu Liang

doi:10.1061/(asce)mt.1943-5533.0001359

Cited by 82 publications

(33 citation statements)

References 31 publications

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“…e SEM photographs show that the FA geopolymers are loose in microstructure and contains a large number of spherical unreacted FA and a small amount of voids at room temperature [80]. e ratio of aluminosilicate gels is much lower than that in MK geopolymers.…”

Section: Discussionmentioning

confidence: 98%

“…erefore, in the further study of geopolymers, it is necessary to study its high-temperature stress-strain behavior. [38,43,60,79,80]. e morphological changes of OPC and geopolymer after heating are compared and analyzed [79].…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, the morphological difference of fired geopolymers derived from different aluminosilicate source materials is also analyzed [38,80].…”

Section: Discussionmentioning

confidence: 99%

“…e increase of strength is due to the greater intergranular connectivity of the aluminosilicate and the unreacted FA resulting from the sintering [62]. e performance of FA and MK geopolymers at high temperature is compared in some former research studies [53,80].…”

Section: Differences Of Aluminosilicate Raw Materialsmentioning

confidence: 99%

“…Adding materials such as QZ and SF into the FA geopolymers can enhance the mechanical properties of the composite geopolymers at high temperature. Fine filler Researchers Tchakoute et al [76] Lahoti et al [77] Aygörmez et al [78] Duan et al [43] Duan et al [79] Rovnaník anď Safránková [53] Duan et al [60] Zhang et al [80] Roviello et al…”

Section: Chemical Compositionsmentioning

confidence: 99%

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Thermal and Mechanical Properties of Geopolymers Exposed to High Temperature: A Literature Review

Dai

Wang

2020

Advances in Civil Engineering

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Geopolymers are prepared by alkali solution-activated natural minerals or industrial waste materials, which have been widely used as new sustainable building and construction materials for their excellent thermal and mechanical properties. The thermal and mechanical properties of geopolymers at high temperature have attracted great attention from many researchers. However, there are few systematic works concerning these two issues. Therefore, this work reviewed the thermal and mechanical behaviors of geopolymers at high temperature. Firstly, the thermal properties of geopolymers in terms of mass loss, thermal expansion, and thermal conductivity after high temperature were explained. Secondly, the mechanical properties of residual compressive strength and stress-strain relationship of fly ash geopolymers and metakaolin geopolymers after high temperature were analyzed. Finally, the microstructure and mineralogical characteristics of geopolymers upon heating were interpreted according to the changes of microstructures and compositions. The results show that the thermal properties of geopolymers are superior to cement concrete. The geopolymers possess few mass loss and a low expansion ratio and thermal conductivity at high temperature. The thermal and mechanical properties of the geopolymers are usually closely related to the raw materials and the constituents of the geopolymers. Preparation and testing conditions can affect the mechanical properties of the geopolymers. The stress-strain curves of geopolymer are changed by the composition of geopolymers and the high temperature. The silicon-type fillers not only improve the thermal expansion of the geopolymers but also enhance mechanical properties of the geopolymers. But, they do not contribute to reducing the thermal conductivity. the different raw materials, aluminosilicate precursor and reinforcement materials, result in different geopolymer damage during the heating. However, phase transitions can occur during the process of heating regardless of the raw materials. The additional performance enhancements can be achieved by optimizing the paste formulation, adjusting the inner structure, changing the alkali type, and incorporating reinforcements.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

“…Furthermore, the morphological difference of fired geopolymers derived from different aluminosilicate source materials is also analyzed [38,80].…”

Section: Discussionmentioning

confidence: 99%

Section: Differences Of Aluminosilicate Raw Materialsmentioning

confidence: 99%

Section: Chemical Compositionsmentioning

confidence: 99%

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Thermal and Mechanical Properties of Geopolymers Exposed to High Temperature: A Literature Review

Dai

Wang

2020

Advances in Civil Engineering

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Performance evaluation of fly ash and ground granulated blast furnace slag‐based geopolymer concrete: A comparative study

Yilmazoglu

Yıldırım

Behçet

et al. 2022

Structural Concrete

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Nowadays, geopolymers, which are more environmentally friendly than cement due to the high energy requirements and high carbon dioxide (CO 2 ) emissions of cement production, emerge as alternative binders. In this study, the mechanical and durability properties of geopolymer concrete (GC) based on ground granulated blast furnace slag (GGBS) (100GGBS), 50% fly ash (FA) and 50% GGBS (50FA50GGBS), and FA (100FA) with two different water/geopolymer solids ratios (W/GP) of 0.33 and 0.35 were investigated. Slump, compressive strength, splitting tensile strength, unit weight, water absorption, elevated temperature resistance, abrasion resistance, modulus of elasticity, and drying shrinkage tests were carried out. As the percentage of FA in the mixture increased, the slump of the concrete increased, while the cohesion of the concrete decreased and the setting time was delayed. The addition of GGBS increased the compressive strength and the splitting tensile strength of the GC by up to 377% and 278%, respectively. Under the effect of elevated temperature, the 100FA concrete showed less strength loss and weight loss than other concrete. After the abrasion test, 100GGBS concrete lost about 2.5 times less weight than 100FA concrete. The drying shrinkage of geopolymer mortar reached a maximum of 100 microstrains. Among all concrete, 50FA50GGBS-0.33 showed the highest performance in terms of overall performance.

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Introduction

Rashad

2024

SpringerBriefs in Applied Sciences and Technology

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Comparative Thermal and Mechanical Performance of Geopolymers derived from Metakaolin and Fly Ash

Cited by 82 publications

References 31 publications

Thermal and Mechanical Properties of Geopolymers Exposed to High Temperature: A Literature Review

Thermal and Mechanical Properties of Geopolymers Exposed to High Temperature: A Literature Review

Performance evaluation of fly ash and ground granulated blast furnace slag‐based geopolymer concrete: A comparative study

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