Is magnesia cement low carbon? Life cycle carbon footprint comparing with Portland cement

Shen, Weiguo; Cao, Liu; Li, Qiu; Wen, Zhang; Wang, Jing; Liu, Yun; Dong, Rui; Tan, Yu Ying; Chen, Rufa

doi:10.1016/j.jclepro.2016.05.082

Cited by 101 publications

(25 citation statements)

References 23 publications

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“…This static CO2 curing can make the maximum use of CO2 for accelerated carbonation and facilitate the investigation of the mechanisms of MC carbonation. However, some researchers have pointed out that the static CO2 curing represents an ideal CO2 curing, which is an energy-intensive approach and far from practical application [28]. As the carbonation of MC is rate-limited and quite slow in an atmospheric environment, it has been argued that the re-adsorption of CO2 from the environment will not take place to a meaningful extent in MC during its service life, meaning that the classification of "carbon negative" is doubtful [8].…”

Section: Introductionmentioning

confidence: 99%

Accelerated carbonation of reactive MgO and Portland cement blends under flowing CO2 gas

Wang

Chen

Provis

et al. 2020

Cement and Concrete Composites

137

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Section: Introductionmentioning

confidence: 99%

Accelerated carbonation of reactive MgO and Portland cement blends under flowing CO2 gas

Wang

Chen

Provis

et al. 2020

Cement and Concrete Composites

137

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“…However, reactive magnesia cements are typically derived from carbon-containing magnesite (MgCO3), which is geographically limited and also requires calcination that directly releases CO2. (20,21) The major challenges for improving the energy efficiency and carbon footprint of concrete manufacturing include sourcing carbon-free or low-carbon raw materials that can be (i.) produced at low-cost and large quantities, (ii.)…”

Section: Introductionmentioning

confidence: 99%

Carbon-Negative Cement Manufacturing from Seawater-Derived Magnesium Feedstocks

Badjatya

Akca

Alvarez

et al. 2021

Preprint

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This study describes and demonstrates a carbon-negative process for manufacturing cement from widely abundant seawater-derived magnesium (Mg) feedstocks. In contrast to conventional Portland cement, which starts with carbon-containing limestone as the source material, the proposed process uses membrane-free electrolyzers to facilitate the conversion of carbon-free magnesium ions (Mg2+) in seawater into magnesium hydroxide (Mg(OH)2) precursors for the production of Mg-based cement. After a low-temperature carbonation curing step converts Mg(OH)2 into magnesium carbonates through reaction with carbon dioxide (CO2), the resulting Mg-based binders can exhibit compressive strength comparable to that achieved by Portland cement after curing for only two days. Although the proposed “cement-from-seawater” process requires similar energy use per ton of cement as existing processes, its potential to achieve a carbon-negative footprint makes it highly attractive to decarbonize one of the most carbon intensive industries.

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“…Conventional PC has associated around 800–900 kg of CO 2 eq per metric ton of cement (Shen et al. ) and the production of clinker ranges 900–1,000 kg CO 2 eq per ton of clinker(Boesch & Hellweg, ; Galvez‐Martos & Schoenberger, ; Hanein, Galvez‐Martos, & Bannerman, ). Thus, in the long‐term view of a low‐carbon economy, the production of new binders with lower unavoidable emissions is a priority for the future development of the cement industry (Gartner & Sui, ).…”

Section: Introductionmentioning

confidence: 99%

Eco‐efficiency assessment of calcium sulfoaluminate clinker production

Gálvez‐Martos

Valente

Martínez‐Fernández

et al. 2019

J of Industrial Ecology

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Calcium sulfoaluminate-based cements (CSA) are proposed as a cement alternative with a low carbon footprint. The nature of CSA makes the manufacturing process to require lower temperature, less fuel, and less calcite. However, it requires aluminum oxide, Al 2 O 3 , which would be originated from bauxite and bauxite-derived wastes, and sulfur, coming from calcium sulfate or elemental sulfur. An eco-efficiency assessment of CSA cements, benchmarked against the conventional Portland cement, has been performed following the principles of ISO 14045 on eco-efficiency for a total of 240 CSA clinker production scenarios. The eco-efficiency indicator relates an environmental indicator with a product system value indicator, and it is calculated for each of the studied parameters: bauxite geographical origin, the fuel used for clinkering, the source of sulfur, and the composition of the clinker. Eco-efficiency results show a strong dependence on the origin of bauxite, while other parameters, as the fuel used, its content in sulfur, or the supply of other raw materials, are of less importance. The most eco-efficient solutions are those with certain closeness to bauxite sources. To achieve global solutions, that is, cement-making based on CSA independently of the origin of the raw materials, the amount of bauxite needs to be minimized and CSA composition restricted.

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Is magnesia cement low carbon? Life cycle carbon footprint comparing with Portland cement

Cited by 101 publications

References 23 publications

Accelerated carbonation of reactive MgO and Portland cement blends under flowing CO2 gas

Accelerated carbonation of reactive MgO and Portland cement blends under flowing CO2 gas

Carbon-Negative Cement Manufacturing from Seawater-Derived Magnesium Feedstocks

Eco‐efficiency assessment of calcium sulfoaluminate clinker production

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