Hoang Nguyen

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Verified

Hoang verified their affiliation via an institutional email.

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• Ph.D.
• Academy Research Fellow at University of Oulu

Carbon mineralization is expected to play a key role in the mitigation of climate change, as viable and efficient carbon capture and utilization (CCU) pathway. Indeed, the process has the advantage of enabling the recycling of waste-streams such as mine tailings or desalination brine, as well as the prospect of large-scale uptake of carbon dioxide...

Nesquehonite (MgCO3·3H2O) is of interest as a carbon sink for mineral carbonation as its formation is kinetically favored at ambient temperatures and pressures and offers the highest CO2 : MgO ratio compared to most other hydrated magnesium carbonates (HMCs). However, the phase tends to convert to more stable HMCs depending on the environment and t...

The cement industry needs radical solutions to reduce its carbon emissions. Here, we look at the fundamental question about the cohesion of cement, and give our perspectives on an overlooked factor: the amorphicity of cement reaction products. We discuss how the amorphicity can enable a scientifically-guided strategy to design and realize novel cem...

Formation of hydrated magnesium carbonate (HMC) cement phases from the carbonation of brucite has been investigated using synchrotron radiation (SR) based scanning transmission X-ray microscopy (STXM) at Mg and O K-edges. HMC is formed from the reaction of brucite and sodium bicarbonate in water. The introduction of magnesium acetate as a ligand in...

This work offers in-depth understanding about the behavior of different M-S-H phases under carbonation. Here, we carbonated 8-year-old M-S-H samples under i) wet carbonation and ii) dried or steamed pressurized CO2. Both solid and liquids samples were analyzed using various techniques while thermodynamic modelling was coupled to shed light on the r...

Giorgiosite is a relatively unknown hydrated magnesium carbonate (HMC) without a clear understanding of its characteristics and synthesis pathway. The phase has a nano-wire morphology with high surface area, and hence, attracts immediate interests for various applications including as early-strength-giving phase in HMC-based binder. However, there...

MgO-based cements have the potential for low carbon binders especially when MgO is sourced from noncar-bonate minerals. Understanding the reaction kinetics and products formed are the keys to pave the way for these binders as construction materials. In this study, the influence of acetate on hydration and subsequent carbonation of reactive MgO is i...

The cement industry is a major contributor to the anthropogenic CO2 emissions, with about 8% of all emissions coming from this sector. The global cement and concrete association has set a goal to achieve net-zero CO2 concrete by 2050, with 45% of the reduction coming from alternatives to Portland cement, substitution, and carbon capture and utiliza...

This study investigates deep learning-based backscattered electron (BSE) image segmentation as a novel approach to automatise phase quantification of cementitious materials and estimate their degree of hydration and porosity. The case study was on Portland cement paste that hydrated from 1 day to 2 years. The initial findings suggest that using arb...

The effect of carbonate on the magnesium silicate hydrate (M-S-H) formation was studied at high Mg/Si molar ratio of 1.5. M-S-H pastes were synthesized from silica fume and MgO or MgO plus hydromagnesite in a Na2CO3 containing solution. X-ray diffraction data and thermogravimetric analysis indicated that brucite is destabilized and M-S-H phases for...

Magnesium-rich minerals can capture and store CO2 as stable magnesium carbonate minerals and can be utilized to produce construction materials with low or even negative carbon footprints. Organic ligands influence the growth and morphology of the magnesium carbonates. Among these ligands, acetate is known to enhance the formation of carbonates. How...

This study intends to advance the poor knowledge on the ability of an ettringite-based binder to obtain autogenous self-healing and its relevant mechanism. We developed a high-performance polypropylene fiber-reinforced cementitious composite using a slag-based ettringite binder and investigated its autogenous healing property under water-saturated...

The use of calcined clays in construction materials has attracted significant attention in the last few years. Based on the continued need for sustainable construction materials to meet global development...

Partial replacement and co-hydration of calcium aluminate cement (CAC) with ladle slag was investigated in this study as a pathway in valorizing the slag and reducing the economic cost of CAC. The impact of this replacement on the physical and microstructural properties were analysed using different techniques such as mechanical strength test, free...

The mechanisms involved in the natural formations of dolomite (CaMg(CO3)2) and magnesite (MgCO3) have endured as challenging research questions over centuries, being yet a matter under investigation in multiple fields....

This study investigates deep learning-based backscattered electron (BSE) image segmentation as a novel approach to automatise phase quantification of cementitious materials and estimate their degree of hydration and porosity. The case study was on Portland cement paste that hydrated from 1 day to 2 years. The initial findings suggest that using arb...

Correction for ‘Mechanisms of Mg carbonates precipitation and implications for CO 2 capture and utilization/storage’ by Hellen S. Santos et al. , Inorg. Chem. Front. , 2023, https://doi.org/10.1039/d2qi02482a.

This paper reports on the synthesis and characteristics of a novel aluminosilicate glass-based cementitious binder. We investigated the hydration kinetics, degree of reaction, and phase assemblage of the glass via XRD, DTG, 27 Al and 29 Si MAS NMR, FTIR, SEM/EDS and thermodynamic modelling. The glass exhibits hydraulic properties in which the binde...

Reactive magnesium oxide (MgO)-based cement (RMC) can play a key role in carbon capture processes. However, knowledge on the driving forces that control the degree of carbonation and hydration and rate of reactions in this system remains limited. In this work, density functional theory-based simulations are used to investigate the physical nature o...

Reactive magnesium oxide (MgO)-based cement (RMC) can play a key role in carbon capture processes. However, knowledge on the driving forces that control the degree of carbonation and hydration and rate of reactions in this system remains limited. In this work, density functional theory-based simulations are used to investigate the physical nature o...

The role of organic ligands on the formation of hydrated magnesium carbonates (HMCs) has been remaining unclear. This work reports insights into the effects of Mg-acetate on the carbonation of brucite including the kinetics of reaction, the precipitation of different HMCs, and reaction mechanisms. We found that the organic ligand increases the kine...

Solid-state electrolytes (SSEs) are considered as the most promising materials for enabling the safer, more efficient, and feasible solution to address the market demands for lithium-ion batteries. The current work investigates the production of inorganic SSEs from silicate minerals, which are abundant materials in natural resources (kaolinite) as...

This paper details the effect of fiber reinforcement on mechanical characteristics of by-products based one-part alkali activated material (AAM). Two different binder matrices were considered in this study, such as, plain slag, and ternary blended slag, to understand their efficiency in fiber reinforced system. These matrices were reinforced with 1...

The recycling of steel plant side streams through cold-bonded briquettes has become quite common. However, Portland cement is mainly used as a binder in the briquettes, contributing significantly to the energy consumption, costs, and carbon footprint associated with the production of cold-bonded briquettes. This paper reports on a more sustainable...

Alkali-activated materials (AAMs) are a potential alternative to Portland cement because they can have high strength, good durability and low environmental impact. This paper reports on the structural and mechanical characteristics of aluminosilicate glass with basalt-like compositions, as a feedstock for AAMs. The alkali-activation kinetics, micro...

Alternative cementitious binders, based on industrial side streams, characterized by a low carbon footprint, are profitably proposed to partially replace Portland cement. Among these alternatives, alkali-activated materials have attracted attention as a promising cementitious binder. In this paper, the chemical stability of the matrix, in fiber-rei...

In this study we compare the leaching behavior and the antibacterial and cytotoxic properties of 100% slag or stone wool derived alkali activated materials. The antibacterial activity was measured as the inhibiting capacity against two Gram-negative bacterial strains, Escherichia coli and Pseudomonas aeruginosa and one Gram-positive bacterial strai...

Little is known about the performance of ettringite-based binders in hydrothermal conditions. This investigation aims to gain insights into the phase evolution and corresponding mechanical performance of an ettringite-based binder considering crystallization pressure caused by late-reaction products. Additionally, the role of fiber reinforcement on...

This study aims to obtain insights into the retardation mechanism of citric acid in an ettringite-based binder from ladle slag and gypsum. The hydration kinetics and phase assemblage of the binder were experimentally investigated and thermodynamically modelled. Additionally, the effects of citric acid on synthetic ettringite were studied to obtain...

This study evaluates the effects of the manufacturing process and fiber reinforcement on low-velocity impact response of the recently developed PVA fiber-reinforced alkali-activated stone wool composites. To this end, reinforced and unreinforced specimens manufactured by hot-pressing were compared with those oven curing. The results revealed a simi...

The generation of glass wool waste and mine tailings has raised increasing concerns. This paper deals with the reuse of glass wool waste and lithium mine tailings from spodumene ore (quartz feldspar sand; QFS) in the development of building ceramic materials. The effect of glass wool particle size and sintering temperatures (750, 850 and 950 °C) we...

In this investigation, ettringite-based mortars were synthesized from ladle slag (LS) and phosphogypsum (PG), promoting the concept of a circular economy. However, the reuse of naturally occurring radioactive materials (NORM), such as PG, requires radiological investigation. Also, the immobilization degree for contaminants contained in PG should be...

Cementitious composite that has short molding time and high mechanical performance is favorable in pre-cast concrete industry. In this context, this study reports the use of hot-pressing technique to fabricate PVA fiber reinforced composites using alkali-activated stone wool (a waste from building insulation). Eight different mixtures were develope...

Aiming to utilize phosphogypsum (PG) as a construction material, this study investigated the potential use of PG as a calcium sulfate source for the production of an ettringite-based binder (LSG). Six compositions with different percentages and PG's of different origin were hydrated with ladle slag (LS) to form LSG. The hydration, mineralogy and co...

The retardant effects of citric acid on the properties of ettringite binders are not yet fully understood. This investigation provides insights into the effects of citric acid on both the fresh and hardened state properties of the binder produced from the hydration between ladle slag and gypsum (LSG). The results revealed that LSG's initial setting...

High-performance fiber reinforced cementitious composites from ettringite-based binders require much understanding of durability before its real-life applications in construction industry. A strain-hardening fiber reinforced ettringite-based composite from the hydration between ladle slag and gypsum with polypropylene (PP) fibers was the object in...

Ladle slag, an industrial waste from steel manufacturing processes, is an interesting raw material for sustainable inorganic binders. In earlier work, we have developed an ettringite-based binder (LSG) from the hydration between ladle slag and gypsum. In addition, polypropylene (PP) fiber was employed to attain a strain-hardening cementitious compo...

Ladle slag (LS) is a byproduct from the steel industry that is usually reactive on its own and hydrates towards cementitious phases when mixed with water. However, these reaction products are often metastable, leading to micro-structural changes between 7 and 30 days after mixing. To address this issue, in this experimental investigation, a new bin...

The use of industrial by-products brings both economic and environmental benefits. Ladle slag (LS) from steel processes is a promising raw material and has been used as a precursor in a few studies. To better understand the benefits of LS mainly on mechanical behavior, in this investigation, an ettringite-based binder was produced from the hydratio...

The development of high-performance cementitious composites from industrial side streams, which has both economic and environmental benefits, is of high demand. Ladle slag is a promising by-product from the steelmaking industry, which can form an ettringite-based binder. This experimental investigation focuses on the mechanical properties of differ...

Alkali-activated ladle slag (AALS) is a promising cementitious material with environmental benefits. However, the brittleness of material has been limiting the use in construction. Therefore, in this experimental investigation, different polypropylene (PP) fibers were employed as a short randomly reinforcement in cementitious matrix in order to imp...

This experimental investigation deals with the effects of reclaimed carbon fibres (RCF), carbon fibre reinforced polymer (CFRP) waste, and prepreg carbon waste (PW) of different contents on the mechanical properties of Portland cement mortar. The mechanical properties of reinforced cement mortars were measured by bending, compression and fracture t...

This study investigated the effects of recycled carbon fibres (RCF) and carbon fibre reinforced polymer (CFRP) waste of different percentages on the mechanical properties of Portland cement composite through laboratory testing. Portland cement mortars reinforced by either RCF or CFRP waste were tested for flexural strength, stiffness, and fracture...

The main objective is to study a fire protection solution up to 1300 oC heat temperature by exploiting latent heat property of phase change material minerals. Natural well-crystallized gypsum is common used for such type of application. But there is limit application at temperature below 1100 oC in case of gypsum board. New fireproofing material ba...

One solution of passive fire protection consists in exploiting the characteristic of endothermic phase change of mineral material (gypsum, portlandite, calcite, gibbsite…). Fire severity is in general modeled by temperature evolution including a major variation at the beginning and following by the highest temperature constant at about 1100-1300 0...