The influence of pozzolanic additives on the carbonation rate and Life Cycle Inventory of concrete

Witkowski, Hubert; Koniorczyk, Marcin

doi:10.1016/j.conbuildmat.2020.119301

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…In any case, when pozzolanic materials are incorporated in concrete, the carbonation depth is affected by both the modified hydration mechanisms and the lower pH values. Witkowski and Koniorczyk [44] also pointed out the overestimation risk that the phenolphthalein method enhances when pozzolanic additives are employed in concrete. In Figures 6-8, the SEM images of the concrete specimens for the Pu, PePu, and PeCaPu mixtures are presented, respectively.…”

Section: Resultsmentioning

confidence: 99%

Durability of Structural Lightweight Concrete Containing Different Types of Natural or Artificial Lightweight Aggregates

Badogiannis

Stratoura

Aspiotis

et al. 2021

CMD

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Different structural lightweight concrete mixtures of specific density and strength classes were produced by using various lightweight aggregates (LWAs) such as pumice, perlite, and rice husk ash. Their properties were evaluated in fresh and hardened states with regards to compressive strength and durability parameters such as water absorption (open porosity and capillary absorption), chloride’s penetration resistance, and carbonation depth. According to the results, most LWA concrete mixtures performed satisfactorily in terms of the designed strength and density and they could be used as structural LWA concrete mixtures. As far as the durability of LWA concrete was concerned, open porosity and resistance to the carbonation of LWA concrete were burdened with the porous nature of LWAs, while sorptivity in some mixtures and especially chlorides’ penetration resistance in all mixtures were reported to be significantly improved. The overall strength and durability performance of the designed LWA concrete mixtures could mitigate the concerns stemming from its vulnerability to extreme exposure conditions.

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Section: Resultsmentioning

confidence: 99%

Durability of Structural Lightweight Concrete Containing Different Types of Natural or Artificial Lightweight Aggregates

Badogiannis

Stratoura

Aspiotis

et al. 2021

CMD

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“…On the other hand, in both the 3-day curing condition and the 28-day curing condition, the carbonation rate increases with the higher silica fume content in the mortars. This fact can be attributed to the decrease in portlandite since it reacts with the reactive silicon present in the silica fume [ 9 , 21 ], which is an amorphous, highly reactive pozzolan, to form a new C-S-H gel with low Ca/Si ratio [ 21 ]. Therefore, the pH of the pore solution decreases.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, carbon dioxide uptake by mortars and concretes has recently been included in the Global Carbon Budget report [ 43 ] since natural carbonation stores permanently carbon dioxide. Furthermore, these blended cements usually absorb more carbon dioxide than CEM I [ 7 , 9 , 11 , 18 ]. Then, appropriate methodologies for future concrete mix design should consider durable and sustainable aspects, i.e., to ensure the reinforced concrete service life but also to account for carbon dioxide uptake [ 6 ].…”

Section: Resultsmentioning

confidence: 99%

“…In addition, for climate change mitigation purposes, a more specific and complete inventory may be needed by considering the carbon dioxide uptake by cement-based materials [ 7 ]. Through this, it would be possible to establish a more complete life cycle inventory of concrete in terms of carbon footprint [ 8 , 9 , 10 , 11 , 12 ]. Currently, some low-carbon concretes with embodied carbon dioxide below 100 kg/m 3 CO 2 eq.…”

Section: Introductionmentioning

confidence: 99%

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Carbonation Resistance of Ternary Portland Cements Made with Silica Fume and Limestone

Sanjuán,

Menéndez,

Recino

2024

Materials

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Ternary blended cements, made with silica fume and limestone, provide significant benefits such as improved compressive strength, chloride penetration resistance, sulfates attack, etc. Furthermore, they could be considered low-carbon cements, and they contribute to reducing the depletion of natural resources in reference to water usage, fossil fuel consumption, and mining. Limestone (10%, 15%, and 20%) with different fineness and coarse silica fume (3%, 5%, and 7%) was used to produce ternary cements. The average size of coarse silica fume used was 238 μm. For the first time, the carbonation resistance of ternary Portland cements made with silica fume and limestone has been assessed. The carbonation resistance was assessed by natural carbonation testing. The presence of coarse silica fume and limestone in the blended cement led to pore refinement of the cement-based materials by the filling effect and the C-S-H gel formation. Accordingly, the carbonation resistance of these new ternary cements was less poor than expected for blended cements.

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“…In addition, Younsi et al [29] studied the carbon dioxide uptake of several types of Portland cement concretes after a 10-year natural carbonation and compared the experimental results with the ones calculated by applying the EN 16757 procedure. The standard procedure underestimates the carbon dioxide uptake of concretes made with additions, mainly as a consequence of their carbonation depth underestimation, especially for concretes with a high ground granulated blast-furnace slag content [30].…”

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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The influence of pozzolanic additives on the carbonation rate and Life Cycle Inventory of concrete

Cited by 8 publications

References 23 publications

Durability of Structural Lightweight Concrete Containing Different Types of Natural or Artificial Lightweight Aggregates

Durability of Structural Lightweight Concrete Containing Different Types of Natural or Artificial Lightweight Aggregates

Carbonation Resistance of Ternary Portland Cements Made with Silica Fume and Limestone

Carbon Dioxide Uptake by Brazilian Cement-Based Materials

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