Accelerated carbonation of C2SH based dense concrete

Šiaučiūnas, R.; Hilbig, H.; Prichockiene, Edita; Smigelskyte, Agne; Takulinskas, Zilvinas

doi:10.1016/j.ceramint.2020.05.027

Cited by 16 publications

(6 citation statements)

References 29 publications

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“…10 The statistic K (length-to-width ratio) of CaCO 3 crystals measured in this work and reported in the literature. 26,32,40,69,71 Fig. 11 Schematic illustration of the crystal growth paths of CaCO 3 to form crystals with low and high aspect ratio K at different CO 2 pressures.…”

Section: Discussion Of Mechanismsmentioning

confidence: 99%

“… 16 Siauciunas et al observed that during the carbonation process, CaCO 3 grew from amorphous particles of several hundred nanometers into layered and rhombohedral of 1–2 μm. 40 Li et al found that cube granular or rod-shaped crystals were embedded in the hydration product, calcium-silicate-hydrates (C–S–H), to improve the integrity and compactness of the structure. 41 Qin et al reported irregular granular CaCO 3 crystals in cement–coal gangue paste.…”

Section: Introductionmentioning

confidence: 99%

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Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete

Ruan

Liu

et al. 2022

RSC Adv.

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Section: Discussion Of Mechanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete

Ruan

Liu

et al. 2022

RSC Adv.

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“…About 2000 scans were recorded for each spectrum with a repetition time of 45 s. The chemical shifts were set relative to external tetramethylsilane. The signal patterns of the spectra were deconvoluted with Bruker WINNMR software 19 .…”

Section: Test Methods the Formation Of The Samples And Determinationmentioning

confidence: 99%

Carbonated rankinite binder: effect of curing parameters on microstructure, strength development and durability performance

Smigelskyte

Šiaučiūnas

Hilbig

et al. 2020

Sci Rep

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Due to the high CO 2-footprint of ordinary Portland cement (OPC), the search for alternative binders is now in a full swing. Rankinite-which is a hydraulically inactive material and low in calcium, is a real alternative to OPC, as it absorbs the harmful greenhouse gas from the air through carbonation hardening. Nevertheless, the carbonation hardening has not yet been fully clarified and sufficiently investigated. In this study we show that rankinite achieves a final strength exceeding 100 MPa at 45 °C and 24 h, whereby the binder is only ~ 50% carbonated. The reaction is diffusion limited while a dense layer of carbonation products around the rankinite grains hinders a higher degree of carbonation. The carbonation reaction could be fully characterized by spatially resolved microanalysis such as LA-ICP-MS, NMR and XRD. Finally, durability tests show the excellent suitability of the rankinite binder for a wide range of applications, making it an attractive material not only from an environmental point of view. Concrete is the second largest processed commodity after water consumed annually by the population of Earth 1. Due to such vast demand for the building materials, ordinary Portland cement (OPC) industry is responsible for over 5% of global anthropogenic greenhouse gas emissions, with almost equal amount of CO 2 emitted to the atmosphere after production of one tonne of cement 2-4. Accordingly, the scientific community is struggling to find the solutions for greenhouse gas mitigation and reduction of the negative effect of the cement production. Even though, in the past decades many options to alleviate the adverse effect of OPC production to the environment were proposed 5 , however, recent studies have shown that strategies like clinker substitutions, alternative fuels and/or improved energy efficiency alone will not be sufficient enough to meet the target CO 2 reductions 6. Thus, finding alternative cementitious materials with lower CO 2 footprint than OPC is one the major challenges for the building material industry and the scientific community. At the moment, one of the most promising approaches is the production of low-lime calcium silicate cement (CSC) 7-11. This type of binding material not only requires lower amounts of limestone but also has lower production temperature, thereby resulting in much lower CO 2 emissions 12. Moreover, such binders are environmentally amicable not only due to lower CO 2 emissions, but also for the ability to permanently store CO 2 in the concrete structure in their carbonation hardening process 13. Implementation of such efficient carbonation technologies can potentially lead to cementitious materials becoming one of the largest global CO 2 sequestration sectors 14. Rankinite-Ca 3 Si 2 O 7-is one of such low lime calcium silicates that can be used as an alternative binder that gained more interest recently 7,15,16. Since the CaO/SiO 2 ratio of rankinite is almost twice lower than of ordinary cement, thus it requires lower amounts of calcareous raw materials. The fuel and...

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“…Previous research has focused on the CO2 uptake in specific materials and the mechanical properties of concrete samples manufactured from those materials. The roles of temperature, pressure, humidity, and duration of the curing process have also been studied [28,[56][57][58]. Also, the durability and resistance to seawater conditions [59] and the effect of activator chemicals [60] have been of interest.…”

Section: Carbon-negative Concrete Productionmentioning

confidence: 99%

The Carbon Dioxide Emissions Reduction Potential of Carbon-Dioxide-Cured Alternative Binder Concrete

Mäkikouri

Vares

Korpijärvi

et al. 2021

RPM

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Climate change has been identified as one of the biggest issues plaguing human life at present. Hence, immense attention is being paid to developing methods that can potentially reduce carbon dioxide emission. With the help of carbon-negative concrete, manufactured from alternative binders and cured with waste carbon dioxide, a major part of the manufacturing industries that emit carbon dioxide can be potentially turned into a carbon sink. In this study, the waste material streams in Finland, suitable for disposing carbon-dioxide-cured concrete, were mapped. Mine tailings, blast furnace and steel slags, recycled concrete, biomass, coal and municipal waste incineration ashes, green liquor dregs, and foundry sands were studied. It was found that there were sufficient amounts of potential secondary raw materials (about 27 Mt/a) for the preparation of Finnish cement and the production of concrete (requirement: approximately 1.4 Mt/a and 11.2 Mt/a, respectively). The total carbon dioxide uptake potential was estimated to be approximately 1.9 Mt/a (vs. emissions from the cement industry in Finland, 0.84 Mt/a). In addition, the carbon footprints of the conventionally manufactured concrete block were compared with the carbon footprint produced by a modeled carbon-dioxide-cured blast furnace slag block. If such novel concrete were used to produce all the concrete-based substances, it would bring down the emission of carbon dioxide from 1.9% to negative 1.3% in Finland.

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Accelerated carbonation of C2SH based dense concrete

Cited by 16 publications

References 29 publications

Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete

Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete

Carbonated rankinite binder: effect of curing parameters on microstructure, strength development and durability performance

The Carbon Dioxide Emissions Reduction Potential of Carbon-Dioxide-Cured Alternative Binder Concrete

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Accelerated carbonation of C2SH based dense concrete

Cited by 16 publications

References 29 publications

Morphological characteristics of calcium carbonate crystallization in CO2 pre-cured aerated concrete

Morphological characteristics of calcium carbonate crystallization in CO2 pre-cured aerated concrete

Carbonated rankinite binder: effect of curing parameters on microstructure, strength development and durability performance

The Carbon Dioxide Emissions Reduction Potential of Carbon-Dioxide-Cured Alternative Binder Concrete

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Product

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Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete

Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete