Alkali-Activated Materials and Geopolymer: a Review of Common Precursors and Activators Addressing Circular Economy
Mehrab Nodehi,Vahid Mohamad Taghvaee +1 more
- pp 1-32
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TLDR
In this paper, the authors reviewed different types, mechanisms, and result of mechanical and durability properties of alkali-activated materials and geopolymer reported in literature and discussed future projections of waste materials that have cementitious properties and can replace ordinary Portland cement and be used in alkali activated materials.Abstract:
The vast increase in CO2 and waste generation in recent decades has been a major obstacle to sustainable development and sustainability. In construction industry, the production of ordinary Portland cement is a major greenhouse gas emitter with almost 8% of total CO2 production in the world. To address this, Alkali-activated materials and geopolymer have more recently been introduced as a green and sustainable alternative of ordinary Portland cement with significantly lowered environmental footprints. Their use to replace Portland cement products generally leads to vast energy and virgin materials savings resulting in a sustainable concrete production. In doing so, it reuses the solid waste generated in industrial and manufacturing sectors, which is aligned with circular economy. In turn, it reduces the need for ordinary Portland cement consumption and its subsequent CO2 generation. To provide further insight and address the challenges facing the substitution of ordinary Portland cement, this article reviews different types, mechanisms, and result of mechanical and durability properties of alkali-activated materials and geopolymer reported in literature. Finally, it discusses future projections of waste materials that have cementitious properties and can replace ordinary Portland cement and be used in alkali-activated materials and geopolymer.read more
Citations
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Fire resistance of geopolymer concrete: A critical review
TL;DR: In this paper , a critical literature review of current updates related to the fire performance of RF-reinforced GPC subjected to elevated temperatures and during fires is urgently necessary, conducting critical reviews on the type of RFs, spalling mechanism, physical inspection and properties of the RF-RGPCs.
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Sustainable concrete for circular economy: a review on use of waste glass
TL;DR: In this article, the connection of construction sector and circular economy with recycled glass in its center is reviewed, and it is shown that by partially replacing Portland cement or aggregate with recycling glass, on average, up to 19% greenhouse gas and 17% energy consumption reduction as well as major cost savings can be made.
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A comparative review on foam-based versus lightweight aggregate-based alkali-activated materials and geopolymer
TL;DR: In this paper, the authors provide an updated information on recent advances while stressing the sustainability of lightweight geopolymer materials over ordinary Portland cement products that are vastly in use, including perlite, pumice, shale, ceramsite, and slate sand.
Journal ArticleDOI
Fresh, mechanical and microstructural properties of alkali-activated composites incorporating nanomaterials: A comprehensive review
TL;DR: In this paper , nano-modified alkali-activated composites (AACs) or geopolymers have attracted attention owing to their excellent performance and modification mechanisms, and the results mostly indicated that while increasing nano-additives proportion to a certain extent improves the mechanical characteristics, including compressive, flexural, tensile, and impact strengths, incorporation beyond that amount deteriorates them.
Journal ArticleDOI
The effect of curing regimes on physico-mechanical, microstructural and durability properties of alkali-activated materials: A review
TL;DR: In this article , the most commonly used curing regimes for AAMs are conducted in thermal or ambient temperature environments, adopted in the form of immersion of the AAM in water, ambient and high humidity, sealing, oven and, more recently, microwave curing.
References
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TL;DR: In this paper, an environmentally friendly alkali activated cement powder was prepared by the transformation of air cooled slag (ACS), with low reactivity, into high reactive cementitious material.
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