Accelerated Carbonation of Vibro-Compacted Porous Concrete for Eco-Friendly Precast Elements

Merino-Lechuga, Antonio Manuel; González-Caro, Ágata; Ledesma, Enrique; Jiménez, José Ramón; Fernández-Rodríguez, José María; Suescum-Morales, David

doi:10.3390/ma16082995

Cited by 4 publications

(2 citation statements)

References 74 publications

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“…Merino-Lechuga et al [22] studied the effect of accelerated carbonation on the properties of precast concretes made with natural and recycled aggregates. Natural aggregates were replaced by recycled aggregates and two carbonation conditions were used: accelerated carbonation (5% CO 2 ) and natural carbonation (atmospheric carbon dioxide).…”

Section: General Background On the Carbonation As A Stage In The Deca...mentioning

confidence: 99%

Carbon Dioxide Uptake by Brazilian Cement-Based Materials

da Silva Rego,

Sanjuán,

Mora

et al. 2023

Applied Sciences

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The worldwide cement industry plays an important role in addressing the climate change challenge. Brazil’s cement industry currently has 91 cement plants with an installed production capacity of 94 million tons per year and has started to calculate the net CO2 emissions to achieve a carbon-neutral cement sector by 2050. Accordingly, the carbon dioxide uptake due to mortar and concrete carbonation is subtracted from the carbon dioxide emitted by the chemical reaction for the calcination of lime, i.e., the calcination process performed during clinker production. Now-adays, the Intergovernmental Panel on Climate Change (IPCC) Guidelines for National Greenhouse Gas (GHG) Inventories to report the GHG emissions do not include any calculation procedure to consider the mortar and concrete carbonation. However, the Intergovernmental Panel on Climate Change (IPCC)’s Sixth Assessment Report (AR6) recognizes the physico-chemical process known as carbonation. Brazilian net carbon dioxide emissions of cements produced from 1990 to 2019 are estimated considering the carbon dioxide uptake during the service-life and end-of-life and secondary usage stages (Tier 1). This is a fundamental scientific and technological novelty that changes the current approach to estimate the carbon dioxide emissions due to the Portland cement clinker production. Even considering the relative novelty of this approach, it should be promoted in the future and included in the national inventory report (NIR). The carbon dioxide uptake by mortar and concrete carbonation for 30 years is about 140 million tons. Within this thirty-year period about 483 million tons have been released due to the calcination process.

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Section: General Background On the Carbonation As A Stage In The Deca...mentioning

confidence: 99%

Carbon Dioxide Uptake by Brazilian Cement-Based Materials

da Silva Rego,

Sanjuán,

Mora

et al. 2023

Applied Sciences

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“…Therefore, the rational design of cement-stabilized permeable RA materials that meet road use and permeability requirements is challenging and valuable. Such materials can improve the recycling rate of recycled construction solid waste aggregate and effectively improve the urban ecological environment [33].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Properties and Permeability of Cement-Stabilized Permeable Recycle Aggregate Materials

Zhi,

Yang,

Zhang

et al. 2023

Sustainability

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This paper designed cement-stabilized permeable road subgrade materials. Construction demolition waste with recycled aggregate replaced natural aggregate in cement-stabilized materials to utilize recycled resources for construction solid waste. This paper tests the compressive strength, water permeability, bending strength, and compressive resilience modulus of cement-stabilized permeable recycled aggregate materials under different cementitious additive ratios. The results show that at a recycled aggregate proportion of 30% in cement-stabilized permeable recycled aggregate material, the 7-d unconfined compressive strength exceeds 3.5 MPa, and the permeability coefficient surpasses 3.5 mm/s, which can meet the roadbed requirements in China. The incorporation of recycled aggregates significantly reduces the mechanical properties and water permeability of cement-stabilized permeable recycled aggregate materials, while cementitious additives improve the mechanical properties. Specifically, red brick, old concrete, and ceramics in recycled aggregates weaken the mechanical properties of the skeleton structure of cement-stabilized permeable recycled aggregate materials, and the compressive strength, bending strength, and compressive resilience modulus decrease with the recycled aggregate content. Cementitious additives can fill the micro-pores of the interface transition zone of cement-stabilized permeable recycled aggregate materials to improve the cementation strength between aggregates.

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Use of Milled Acanthocardia tuberculate Seashell as Fine Aggregate in Self-Compacting Mortars

González-Caro,

Merino-Lechuga,

Fernández-Ledesma

et al. 2024

Materials

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This study focuses on the feasibility of using ground Acanthocardia tuberculate seashells as fine aggregates for self-compacting mortar production. The obtained results show a promising future for coastal industries as their use eliminates waste products and improves the durability of these materials. The use of Acanthocardia tuberculate recycled aggregate, in terms of durability, improves the performance of all mixes made with seashells compared to those made with natural sand, although it decreases workability and slightly reduces mechanical strength. Proper mix design has beneficial effects, as it improves compressive strength, especially when the powder/sand ratio is 0.7. Three replacement ratios based on the volume (0%, 50%, and 100%) of natural limestone sand with recycled fine aggregate from Acanthocardia tuberculate seashells, and three different dosages modifying the powder/sand ratio (0.6, 0.7, and 0.8), were tested. The fresh-state properties of each self-compacting mixture were evaluated based on workability. The mineralogical phases of the hardened mixtures were characterised using X-ray diffraction, thermogravimetry, and differential analyses. Subsequently, the mechanical and durability properties were evaluated based on the compressive and flexural strengths, dry bulk density, accessible porosity for water and water absorption, drying shrinkage, mercury intrusion porosimetry, and water absorption by capillarity. Therefore, the use of Acanthocardia tuberculate seashells in cement-based systems contributes to circular economy.

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Accelerated Carbonation of Vibro-Compacted Porous Concrete for Eco-Friendly Precast Elements

Cited by 4 publications

References 74 publications

Carbon Dioxide Uptake by Brazilian Cement-Based Materials

Carbon Dioxide Uptake by Brazilian Cement-Based Materials

Experimental Study on the Mechanical Properties and Permeability of Cement-Stabilized Permeable Recycle Aggregate Materials

Use of Milled Acanthocardia tuberculate Seashell as Fine Aggregate in Self-Compacting Mortars

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