Dispersion, properties, and mechanisms of nanotechnology-modified alkali-activated materials: A review

Wang, Wanli; Wang, Baomin; Zhang, Shipeng

doi:10.1016/j.rser.2023.114215

Cited by 13 publications

(2 citation statements)

References 153 publications

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“…This variability stems from the type of graphene and mixture proportions used. However, regardless of these variations, when graphene is added in amounts less than or exceeding the optimal dosage, there is a decline in strength (and, indeed, other properties). ,, Since FG (and RG) has not been used in cementitious materials in the past, it is important to establish the changes in properties and performance of cementitious materials induced by these materials, given their differences with commonly used GO and rGO as explained earlier. Therefore, 1, 3, and 7 d compressive strengths of cement mortars containing up to 0.10% (by mass of cement) FG were determined, as shown in Figure .…”

Section: Structure and Properties Of Fg- And Rg-modified Mixturesmentioning

confidence: 99%

New Generation Graphenes in Cement-Based Materials: Production, Property Enhancement, and Life Cycle Analysis

Surehali,

Volaity,

Simon

et al. 2024

ACS Sustainable Chem. Eng.

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Several studies have explored the use of graphene to improve the properties of cement-based materials. However, most commercially available graphenes are expensive, not amenable to mass production, and have high embodied energy and emissions, making their use in concrete less attractive, despite the beneficial mechanical property attributes. This paper discusses the use of two novel graphene types, fractal graphene (FG) and reactive graphene (RG), obtained through a cost-effective and scalable detonation synthesis, in cement-based materials. FG and RG are sheets containing 6–10 layers, with lateral dimensions of 20–50 nm and a z-axis thickness of <5 nm. RG is functionalized with carboxylic groups. An ultrasonication process is employed to ensure dispersion of graphene particles in aqueous solutions. Both FG and RG, when added at very small dosages (≤0.04% by mass of cement), enhance the compressive strength of cement mortars by >70% at early ages and up to 20% at later ages. The beneficial effect of functionalization results in better performance for RG-modified mixtures, even at dosages as low as 0.02%. Concomitant enhancements in heat of hydration, hydrate formation, and rheological response are observed. A significant reduction in porosity and critical pore size (by 50% or more) promises significantly improved concrete durability, and thus reduced life-cycle costs. A comparative life cycle analysis (LCA) is used to show that FG- and RG-modified mortars have normalized (by the 28 d strength) energy demand and global warming potential (GWP) that is up to 15% lower than those of conventional mortars. Overall, this study shows that FG and RG, manufactured through a scalable, cost-, energy-, and CO2-efficient detonation synthesis, can beneficially impact the engineering and environmental performance of concretes.

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Section: Structure and Properties Of Fg- And Rg-modified Mixturesmentioning

confidence: 99%

New Generation Graphenes in Cement-Based Materials: Production, Property Enhancement, and Life Cycle Analysis

Surehali,

Volaity,

Simon

et al. 2024

ACS Sustainable Chem. Eng.

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“…However, the variety of glass formulations and their mixing with other materials (polymeric, metallic, ceramic impurities) make a complete "closed-loop recycling" unfeasible. As a result, almost 30% of discarded glass objects lead to waste material, necessitating the search for other valorisation pathways [13,14].…”

Section: Introductionmentioning

confidence: 99%

Waste Glass Upcycling Supported by Alkali Activation: An Overview

Zafar,

Elsayed,

Bernardo

2024

Materials

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Alkali-activated materials are gaining much interest due to their outstanding performance, including their great resistance to chemical corrosion, good thermal characteristics, and ability to valorise industrial waste materials. Reusing waste glasses in creating alkali-activated materials appears to be a viable option for more effective solid waste utilisation and lower-cost products. However, very little research has been conducted on the suitability of waste glass as a prime precursor for alkali activation. This study examines the reuse of seven different types of waste glasses in the creation of geopolymeric and cementitious concretes as sustainable building materials, focusing in particular on how using waste glasses as the raw material in alkali-activated materials affects the durability, microstructures, hydration products, and fresh and hardened properties in comparison with using traditional raw materials. The impacts of several vital parameters, including the employment of a chemical activator, gel formation, post-fabrication curing procedures, and the distribution of source materials, are carefully considered. This review will offer insight into an in-depth understanding of the manufacturing and performance in promising applications of alkali-activated waste glass in light of future uses. The current study aims to provide a contemporary review of the chemical and structural properties of glasses and the state of research on the utilisation of waste glasses in the creation of alkali-activated materials.

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Industrial Application of Bio‐nanomaterials in Oil Industry

Khaire,

Pandey

2024

Bio‐Nanomaterials in Environmental Remediation

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Dispersion, properties, and mechanisms of nanotechnology-modified alkali-activated materials: A review

Cited by 13 publications

References 153 publications

New Generation Graphenes in Cement-Based Materials: Production, Property Enhancement, and Life Cycle Analysis

New Generation Graphenes in Cement-Based Materials: Production, Property Enhancement, and Life Cycle Analysis

Waste Glass Upcycling Supported by Alkali Activation: An Overview

Industrial Application of Bio‐nanomaterials in Oil Industry

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