Boroaluminosilicate Geopolymers

Nazari, Ali; Maghsoudpour, Ali

doi:10.1016/b978-0-12-804524-4.00015-4

Cited by 15 publications

(20 citation statements)

References 29 publications

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“…The results are presented and discussed in Section 3 . Testing geopolymer mixtures using the conventional cementitious mixture standards is common practice [ 33 ], while Rilem Technical Committee 224-AAM is working on providing performance-based specifications and recommendations for the development of standards that will specifically apply to alkali-activated materials [ 34 ].…”

Section: Methodsmentioning

confidence: 99%

Development of a High Strength Geopolymer Incorporating Quarry Waste Diabase Mud (DM) and Ground Granulated Blast-Furnace Slag (GGBS)

Polydorou

Spanou

Savva³

et al. 2022

Materials

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This study presents the development and experimental assessment of novel, high strength, cementless binders that incorporate alkali-activated local waste. A silica-rich diabase mud (DM), currently considered as waste, was previously investigated for geopolymerization, signifying that the DM lacked the necessary reactivity to provide a stable geopolymer binder alone. Moreover, even after incorporation of small amounts of cement and metakaolin, the DM mixtures still did not yield adequate mechanical properties. In this study, the local DM was instead combined with another industrial byproduct known as Ground Granulated Blast-furnace Slag (GGBS) in varying mixtures. The mixture design trials enabled the development of three high strength cementless geopolymer mixtures with 28-day compressive strengths ranging between 60 and 100 MPa, comparable to conventional concrete compressive strengths. The results indicate that the innovative geopolymer material is very promising for the manufacturing of pavement tiles and other precast construction products. Most importantly, this study presents the first successful development of a construction material of adequate compressive strength that can absorb large quantities of the abundant quarry waste, following a course of 10 years of unsuccessful attempts to valorize the local DM. Although difficulties were encountered due to a high reactivity rate, especially for the mix that included the highest GGBS content, prototype pavement tiles were manufactured and assessed experimentally. The results reveal a promising potential of valorizing the local DM in the development of precast geopolymer products, despite the effects of shrinkage cracking on the experimental evaluation of the material mechanical properties.

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Section: Methodsmentioning

confidence: 99%

Development of a High Strength Geopolymer Incorporating Quarry Waste Diabase Mud (DM) and Ground Granulated Blast-Furnace Slag (GGBS)

Polydorou

Spanou

Savva³

et al. 2022

Materials

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“…By combining these starting materials with strong alkali solutions, they are activated and geopolymeric binders are formed, which are a good alternative to cementitious systems. 4,6,[10][11][12] In this context, the best-studied aluminosilicate feedstocks are fly ash, ground blast furnace slags, and silica dust. [13][14][15][16] Because fly ash has already been so extensively studied in this context, this feedstock was used as the reference material for the present investigations.…”

Section: Introductionmentioning

confidence: 99%

“…Alumina and silica‐rich materials (i.e., aluminosilicates) such as fly ash, blast furnace slags, or silica dusts were used. By combining these starting materials with strong alkali solutions, they are activated and geopolymeric binders are formed, which are a good alternative to cementitious systems 4,6,10–12 . In this context, the best‐studied aluminosilicate feedstocks are fly ash, ground blast furnace slags, and silica dust 13–16 .…”

Section: Introductionmentioning

confidence: 99%

Setting behavior and mechanical properties of geopolymers from fly ash and real construction waste

Kugler,

Krcmar,

Teipel

2023

Int J Ceramic Engine & Sci

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Sustainability is becoming an increasingly important factor in the development of new building materials. In terms of the sustainability of concrete components, the biggest challenge is the high energy consumption and associated greenhouse gas emissions in the production of Portland cement. A common strategy used by the construction industry to improve sustainability is to use residuals to develop lower‐emission geopolymer concretes that eliminate high‐emission cement‐based concretes. Because construction and demolition waste, at 3 trillion tons per year worldwide, also represents an environmental risk, this work will investigate the suitability of geopolymers based on real construction waste. In the course of the investigations, the manufactured geopolymer samples are examined for the material parameters relevant to building materials, namely compressive strength, flexural strength, raw density, total porosity, and thermal conductivity. The setting behavior and the forming structures are investigated by infrared spectroscopy, X‐ray diffraction analysis and scanning electron microscopy. The present study is intended to contribute to the development of a suitable recycling strategy for the material recycling of construction waste in novel geopolymer material.

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“…Due to its large demand, even small reductions of greenhouse gas emissions per ton of manufactured concrete can make a significant global impact. Since the production of 1 ton of OPC implies the emission of about 0.5 tons of carbon dioxide and an intensive use of energy, the easiest solution to reduce the environmental impact of construction industry is shifting to alternative cementitious binders [16,17]. In recent years geopolymers, also called alkali-activated cements (AAC), are emerging as promising cementitious materials to provide an environmentally friendly alternative to OPC, since the production of raw materials is less polluting and energy-intensive than OPC [16,18,19,20,21,22].…”

Section: Introductionmentioning

confidence: 99%

“…Since the production of 1 ton of OPC implies the emission of about 0.5 tons of carbon dioxide and an intensive use of energy, the easiest solution to reduce the environmental impact of construction industry is shifting to alternative cementitious binders [16,17]. In recent years geopolymers, also called alkali-activated cements (AAC), are emerging as promising cementitious materials to provide an environmentally friendly alternative to OPC, since the production of raw materials is less polluting and energy-intensive than OPC [16,18,19,20,21,22]. In particular, from the comparison of the life cycle assessment (LCA) studies present in literature, Habert and Oullet-Plamondon concluded that AAC can reduce global warming potential (GWP), i.e., the environmental impact category related to greenhouse gases emissions, by a factor of 4 compared to OPC [23].…”

Section: Introductionmentioning

confidence: 99%

Additive Manufacturing of Geopolymers Modified with Microalgal Biomass Biofiller from Wastewater Treatment Plants

et al. 2019

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This paper deals with the additive manufacturing of metakaolin-based geopolymers and with the use of microalgal biomass from wastewater treatment plants as biofiller in this kind of cementitious material. The study was developed following the evolution stages of the material, which was prepared and printed as a soft paste and then hardened thanks to an inorganic polymerization reaction (geopolymerization). Thus, the characterization techniques adopted encompassed rheometry, mechanical tests performed on the hardened material, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and mercury intrusion porosimetry (MIP). Microalgal biomass addition, evaluated in this study at 1, 3 and 5 php with respect to the powder weight, affected both the properties of the fresh and of the hardened material. Regarding the former aspect, biomass reduced the yield stress of the pastes, improving the ease of the extrusion process, but potentially worsening the ability to build structures in height. When hardened, geopolymers containing microalgae showed mechanical properties comparable to the unfilled material and a microstructure characterized by smaller pores. Finally, a printing test was successfully performed with a larger printer to assess the feasibility of producing large-scale structures. Taking into account these results, this study demonstrates the possibility of using microalgal biomass as biofiller in geopolymers for additive manufacturing.

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Boroaluminosilicate Geopolymers

Cited by 15 publications

References 29 publications

Development of a High Strength Geopolymer Incorporating Quarry Waste Diabase Mud (DM) and Ground Granulated Blast-Furnace Slag (GGBS)

Development of a High Strength Geopolymer Incorporating Quarry Waste Diabase Mud (DM) and Ground Granulated Blast-Furnace Slag (GGBS)

Setting behavior and mechanical properties of geopolymers from fly ash and real construction waste

Additive Manufacturing of Geopolymers Modified with Microalgal Biomass Biofiller from Wastewater Treatment Plants

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