Sustainable Fly Ash Based Geopolymer Binders: A Review on Compressive Strength and Microstructure Properties

Mishra, Jyotirmoy; Nanda, Bharadwaj; Patro, Sanjaya Kumar; Krishna, R.S.

doi:10.3390/su142215062

Cited by 16 publications

(2 citation statements)

References 141 publications

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“…In this hump, amorphous gel peaks exist. New peaks are also observed near 26-30⁰ which are the results of formation of CSH gel products [20].…”

Section: Xrdmentioning

confidence: 90%

Experimental Study: Fracture Properties Of Fly Ash-Slag Based Geopolymer Concrete

Ranjan,

Ramaswamy

2023

Proceedings of the 11th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Geopolymer concrete (GPC), also termed as Alkali activated material is an innovative and green concrete, serving as an alternative to the ordinary Portland cement (OPC) concrete. This study aims to investigate the flexural behavior of geopolymer concrete to better understand the mechanical properties and potential application in structural engineering. This research involves the formulation of geopolymer mixes using various binder compositions, incorporating different types of aggregates, and curing at ambient conditions. The experimental program includes 3-point bending tests on the prismatic geopolymer specimens to evaluate their flexural strength, load-CMOD, and cracking behavior. Additionally, the effect of GGBFS content in GPC has been studied. The results of the study revealed that geopolymer concrete exhibits considerable flexural strength comparable to the OPC concrete.

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“…In this hump, amorphous gel peaks exist. New peaks are also observed near 26-30⁰ which are the results of formation of CSH gel products [20].…”

Section: Xrdmentioning

confidence: 90%

Experimental Study: Fracture Properties Of Fly Ash-Slag Based Geopolymer Concrete

Ranjan,

Ramaswamy

2023

Proceedings of the 11th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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“…Therefore, it can be concluded that geopolymer binders without using cement are a highly promising eco-friendly construction material. Figure 20 (Mishra et al, 2022) shows that these geopolymer composites can be produced using industrial wastes, promoting sustainable development and benefiting the environment.…”

Section: Figure 18mentioning

confidence: 99%

Towards modern sustainable construction materials: a bibliographic analysis of engineered geopolymer composites

Zhang,

Li,

Gamil

et al. 2023

Front. Mater.

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Engineered cementitious composites (ECC) exhibits impressive tensile strength but has significant environmental drawbacks due to high cement consumption. Recently, engineered geopolymer composites (EGC) have gained attention as a potential ECC alternative. This comprehensive study reviews the latest EGC advancements, encompassing mix design, design theory, engineering properties, environmental benefits, and durability. It emphasizes how factors like activators, precursors, fibers, additives, and aggregates impact EGC properties, making it a cost-effective material for fire, chemical resistance, and dynamic loads. To address limitations in traditional literature reviews, innovative research methods, including scientometric analysis, were employed to provide a cohesive analysis. This review aims to facilitate knowledge dissemination and collaboration by summarizing EGC advances and highlighting remaining challenges in developing practical applications. It is revealed from the review that various manufacturing methods enhance geopolymers, especially in geopolymer concrete, where replacing 50% of ordinary Portland cement with fly ash boosts strength. Geopolymer concrete excels in pre-cast applications, offering durability and resistance to harsh conditions as an eco-friendly alternative to Portland cement. It suits highway pavement, walls, marine coatings, and tiles, reducing carbon emissions and promoting efficient waste management. EGCs find broad use in construction due to their strong, durable, and eco-friendly qualities, supporting sustainable infrastructure development.

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Geopolymer Composites with Recycled Binders

Kalinowska-Wichrowska,

Pawluczuk,

Kosior-Kazberuk

et al. 2024

Springer Proceedings in Materials

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The application of geopolymers as an alternative to cement concretes is becoming increasingly important. The significant advantage of this composites is that, the basic ingredient is not a cement, but pozzolans such as waste materials—fly ash, fly ash slag mix, red ceramic fines, recycling cement mortar—which makes building materials more environmentally friendly. Currently the availability of blast furnace slag and high-quality fly ash is limited in Europe. At the same time, the ways for management of the concrete rubble and the construction waste are being sought, because the volume of waste materials is constantly increasing.Therefore, the application of secondary binders extracted from the recycling of various construction waste (recycled cement mortar, red ceramic fines, fly ash-slag mix) in geopolymers was proposed. The recycled binders were introduced into geopolymer composites as a replacement of 25% by mass of primary binder (fly ash) and the 65, 75 and 85ºC was the curing temperature. The process of manufacturing the recycled binders has been described and basic parameters of new binders. The tests of physical and mechanical properties of the composites such as compressive strength, flexural strength, volume density in dry state and saturated one and water absorption were performed. The microstructure of geopolymers was examined using scanning electron microscopy (SEM). The results obtained show that recycled binders obtained from the treatment of construction waste could be a valuable component of geopolymers.

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Sustainable Fly Ash Based Geopolymer Binders: A Review on Compressive Strength and Microstructure Properties

Cited by 16 publications

References 141 publications

Experimental Study: Fracture Properties Of Fly Ash-Slag Based Geopolymer Concrete

Experimental Study: Fracture Properties Of Fly Ash-Slag Based Geopolymer Concrete

Towards modern sustainable construction materials: a bibliographic analysis of engineered geopolymer composites

Geopolymer Composites with Recycled Binders

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