Recycling of waste oyster shell and recycled aggregate in the porous ecological concrete used for artificial reefs

Kong, Jiafeng; Cong, Ganwen; Ni, Songyuan; Sun, Jianguo; Guo, Cheng; Chen, Mingxu; Quan, Hongzhu

doi:10.1016/j.conbuildmat.2022.126447

Cited by 31 publications

(21 citation statements)

References 24 publications

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“…For instance, Li et al [ 9 ] used the recycled aggregate to produce planting concrete, and they discovered that the frost resistance is enhanced by 12.4%, and the drying shrinkage is reduced by 20.5%. Kong et al [ 10 ] used WOS and recycled aggregate (RA) to prepare the porous ecological concrete toward AR, and they found that the interconnected porosity was affected less in ecological concrete, and the alkalinity of leachate becomes close to seawater.…”

Section: Introductionmentioning

confidence: 99%

Impacts from Waste Oyster Shell on the Durability and Biological Attachment of Recycled Aggregate Porous Concrete for Artificial Reef

Kong

Guo

et al. 2022

Materials

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Poor biological attachment of artificial reef (AR) prepared by the recycled aggregate limit the application in the area of marine engineering. In this study, the waste oyster shell (WOS) was used as raw materials to prepare the recycled aggregate porous concrete (RAPC), the compressive strength, split tensile strength, chloride penetration resistance, freezing-thawing resistance, low temperature resistance, and the biological attachment were tested, aiming to improve the biological attachment and decrease carbon dioxide emission. The experiment results demonstrate that the use of WOS can decrease the compressive and split tensile strength, but the effect of designed porous structure on the mechanical strength is higher than that of WOS. To ensure the durability of RAPC, the contents of WOS should not exceed 20%. Additionally, the addition of WOS and designed porous structure are beneficial to biological attachment. However, the porous structure of RAPC only improves biological attachment in the short term, and the reverse phenomenon is true in the long term. As the partial replacement of cement with WOS is 40%, the total carbon dioxide emission decreases by about 52%. In conclusion, the use of WOS in the RAPC is an eco-friendly method in the artificial reef (AR) with improved ecological attachment and reduced carbon dioxide emission.

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Section: Introductionmentioning

confidence: 99%

Impacts from Waste Oyster Shell on the Durability and Biological Attachment of Recycled Aggregate Porous Concrete for Artificial Reef

Kong

Guo

et al. 2022

Materials

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“…However, concrete has a relatively high environmental impact, which has led to the development of more sustainable concrete mixtures (e.g. Perkol‐Finkel et al 2018; Kong et al 2022). Elsewhere, biodegradable materials have been applied in coastal restoration to overcome settlement thresholds, where the reef community will take over when the structure degrades (Nitsch et al 2021; Nauta et al 2023).…”

Section: Discussionmentioning

confidence: 99%

Enhancing ecological complexity in soft‐bottom coastal ecosystems: the impact of introducing hard substrates

Witte,

Dickson,

Franken

et al. 2024

Restoration Ecology

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Coastal ecosystems globally face pressures, with natural coastal habitats being replaced by engineered structures. While hard structures for navigation‐purposes and coastal defense can negatively impact native communities, they can also be applied in ecological restoration as artificial reefs. This way substrates may facilitate establishment of biogenic (shellfish) reefs and provide habitat heterogeneity in soft‐sediment ecosystems. In a 1.5‐year experiment, we introduced six different types of natural or biodegradable hard substrates in a subtidal soft‐sediment system. We compared the substrates with surrounding soft sediment and evaluated differences among substrate types using biodiversity indices, community composition analyses, and food web indicators. This offers a comprehensive understanding of how the introduced hard substrates affect ecosystem complexity. Overall ecological complexity indicators were higher in the second year of the experiment. We found a significant increase in species richness, community composition, and link density (number of feeding interactions per species) on hard substrates compared to the surrounding sediment. However, Shannon diversity index and food web connectance (measure of food web saturation) did not differ between substrates and the surrounding sediment. Although differences among types of hard substrates were small, certain species were uniquely associated with specific substrates with wood and granite performing best. While there was no establishment of epibenthic shellfish reefs within 1.5 years, we conclude that introducing hard substrates effectively enhances ecological complexity in soft‐bottom coastal ecosystems within that timeframe. We recommend the use of substrates with a historical ecological relevance in the system for scaling up introduction of substrates for ecological restoration.

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“…A study conducted in South Korea showed that small oyster shell particles (2-0.074 mm) were a potential substitute for conventional mortar sands in terms of compressive strength [44]. Additionally, waste oyster shells are a potential hard substrate for preparing arti cial reefs for coral and oyster reef restoration [45,46,47,48]. Hence, the reuse of oyster shells and their variety of applications could represent a new income stream for the oyster industry, while allowing its transition towards a blue circular economy.…”

Section: Ecosystem Servicesmentioning

confidence: 99%

Oysters, a sustainable bluefood?

Domech,

Cooney,

Tahar

et al. 2024

Preprint

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Sustainable food production that meets consumer demands while reducing environmental impacts is a critical societal challenge. The seafood industry, including shellfish aquaculture, is considered a key segment for future protein supplies. Like all food production sectors, environmental impacts of the "blue food” sector are a key consideration. The present study demonstrated that Irish Pacific oyster (Magallana gigas) farming has relatively low environmental impacts (i.e., 100-year global warming potential of 373.86 kg CO2 eq. tonne-1; acidification potential of 1.33 kg SO2 eq. tonne-1; and eutrophication potential of 0.39 kg PO4 eq. tonne-1) compared to other seafood and terrestrial animal sectors. Using ecosystem services metrics, one tonne of fresh harvested oysters can remove, on average, 3.05 tonnes of nitrogen, 0.35 tonnes of phosphorus, and sequester 70.52 tonnes of carbon from the environment, thus potentially acting as a nutrient remediator and a potential short-term carbon sink. These findings show how oysters can offer a sustainable food source and provide local environmental benefits. The study also points to future work which could further improve ecosystem services modelling for this food source.

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Recycling of waste oyster shell and recycled aggregate in the porous ecological concrete used for artificial reefs

Cited by 31 publications

References 24 publications

Impacts from Waste Oyster Shell on the Durability and Biological Attachment of Recycled Aggregate Porous Concrete for Artificial Reef

Impacts from Waste Oyster Shell on the Durability and Biological Attachment of Recycled Aggregate Porous Concrete for Artificial Reef

Enhancing ecological complexity in soft‐bottom coastal ecosystems: the impact of introducing hard substrates

Oysters, a sustainable bluefood?

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