Magnesium-based cements for CO2 capture and utilisation

Morrison, Jennie; Jauffret, Guillaume; Gálvez‐Martos, José‐Luis; Glasser, F. P.

doi:10.1016/j.cemconres.2015.12.016

Cited by 76 publications

(24 citation statements)

References 12 publications

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“…Chemicals such as NaOH can be added to accelerate and enhance the process even further [7]. Most recent research developments in producing CO 2 uptake cements depart from calcium (and magnesium)-rich materials and relate to 1) accelerated curing of concrete [8][9][10], 2) carbonation of brines [11][12][13], 3) carbonation of hydrated lime [14,15] and 4) carbonation of calcium silicates [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Carbonate-bonded construction materials from alkaline residues

Nielsen¹,

Baciocchi²,

Costa³

et al. 2017

RILEM Tech Lett

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Accelerated carbonation is a rapidly developing technology that is attracting attention as it uses CO 2 as a binder to make construction materials. Originally stemming from geochemical and environmental research into CO 2 sequestration or waste remediation, accelerated carbonation has been developed into a technology that enables to transform alkaline precursors into products that meet technical requirements for use as aggregates or shaped blocks. Alkaline precursors can be manufactured from primary resources or derived from industrial residues: a.o. metallurgical slags, incineration ashes and concrete recycling residues are prone to carbonate under controlled conditions. Moist carbonation of shaped Ca-silicate rich precursors at elevated curing temperature and CO 2 concentration or pressure has delivered the most promising results so far. This letter presents an overview of current accelerated carbonation approaches to make carbonate-bonded construction materials from alkaline residues. The general carbonation mechanism is explained and two application routes are exemplified: i.e. production of lightweight aggregates and compact blocks by accelerated moist carbonation.

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Section: Introductionmentioning

confidence: 99%

Carbonate-bonded construction materials from alkaline residues

Nielsen¹,

Baciocchi²,

Costa³

et al. 2017

RILEM Tech Lett

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“…At temperatures above 50 • C hydromagnesite (HM) and ammonium sulphate are formed according to reaction (R3) and below 50 • C NQ and ammonium sulphate are formed [8,20,21]. Moreover, if the CO 2 vapour pressure is below 0.01 bar at lower temperatures reaction (R3) is favoured over reaction (R4) [8].…”

Section: Production Of Nesquehonitementioning

confidence: 99%

“…In Figure 3b, the sample used for 20 tests is shown, and the NQ is clearly visible although, also rose-alike clusters are visible. According to other researchers, NQ crystals are needle shaped and HM crystal are shaped as irregular flakes in spherical clusters [21,22]. Moreover, the amount of HM seems not to affect the cyclabilty and hydration of the sample (Named Sample 1 Section 4).…”

Section: Tes Combined With Exhaust Air Heat Pumpmentioning

confidence: 99%

“…Samples were kept for 1 week, 2 weeks and 2 months under atmospheric conditions for comparison with the original sample. The risk of emitting 1 out of 5 CO 2 from NQ resulting in HM (not reversible) can be monitored by scanning electron microscopy (SEM) [9,20,21]. As mentioned earlier, according to Hill et al NQ forms HM if stored under 1% of CO 2 at 25 • C, and under 0.1% of CO 2 at 10 • C although, the rate of this process seems to be unknown [7].…”

Section: Tes Combined With Exhaust Air Heat Pumpmentioning

confidence: 99%

“…According to others, NQ are needle shaped crystals (e.g., Figure 3a) and hydromagnesite (HM) is irregular flakes that in (e.g., partly in Figure 3b), which makes it of interest to analyse the crystals' appearance using SEM pictures [21,22].…”

Section: Sample Morphology Crystal and Efficiencymentioning

confidence: 99%

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Hydration of Magnesium Carbonate in a Thermal Energy Storage Process and Its Heating Application Design

Erlund

Zevenhoven

2018

Energies

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First ideas of applications design using magnesium (hydro) carbonates mixed with silica gel for day/night and seasonal thermal energy storage are presented. The application implies using solar (or another) heat source for heating up the thermal energy storage (dehydration) unit during daytime or summertime, of which energy can be discharged (hydration) during night-time or winter. The applications can be used in small houses or bigger buildings. Experimental data are presented, determining and analysing kinetics and operating temperatures for the applications. In this paper the focus is on the hydration part of the process, which is the more challenging part, considering conversion and kinetics. Various operating temperatures for both the reactor and the water (storage) tank are tested and the favourable temperatures are presented and discussed. Applications both using ground heat for water vapour generation and using water vapour from indoor air are presented. The thermal energy storage system with mixed nesquehonite (NQ) and silica gel (SG) can use both low (25-50%) and high (75%) relative humidity (RH) air for hydration. The hydration at 40% RH gives a thermal storage capacity of 0.32 MJ/kg while 75% RH gives a capacity of 0.68 MJ/kg.

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MgO‐based binders

Lothenbach,

Bernard,

German

et al. 2023

ce papers

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To limit global temperature rise to below 2°C, we need to radically and rapidly change the way we build and use materials, since construction is responsible for 20‐40% of industrial CO2 emissions. Magnesium carbonate‐based cements have the potential to become a major carbon sink in construction industry, as CO2 will not be emitted during their production, but CO2 will rather be bound during hardening. Two different reaction mechanisms lead to setting and hardening of such HMC cements: i) hydration of MgO‐Mg‐carbonate, also in blends with silica and other mineral additions, in the presence of water or salt solutions (such as sodium bicarbonate solution) at ambient conditions or ii) carbonation hardening of MgO‐based systems at increased CO2 partial pressure and/or at increased temperatures.However, the utilization of hydrated magnesium carbonate and magnesium silicate cements is currently hampered by the lack of systematic experiments and of fundamental understanding of the factors affecting the hardening process, mechanical properties, long‐term behavior and durability. In particular, the role of temperature, relative humidity and addition of supplementary cementitious materials and/or industrial by‐products has not been systematically investigated. We need knowledge both on the practical side through systematic experiments with pastes, mortars and concretes as well as on a fundamental level through solubility and sorption experiments and thermodynamic modelling. In addition, reaction kinetics need to be optimized as well as the early formation of the preferred phases (stability enhancement) to develop efficient HMC cements for construction. Due to the socio‐economic relevance of cement and concrete, the impact of such “carbon”‐negative cements may go beyond a purely scientific one and lead to technological breakthroughs to the benefit of environment and society.

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Magnesium-based cements for CO2 capture and utilisation

Cited by 76 publications

References 12 publications

Carbonate-bonded construction materials from alkaline residues

Carbonate-bonded construction materials from alkaline residues

Hydration of Magnesium Carbonate in a Thermal Energy Storage Process and Its Heating Application Design

MgO‐based binders

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