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废弃牡蛎壳对用于人工鱼礁的再生骨料多孔混凝土耐久性和生物附着性的影响

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

作者信息

Kong Jiafeng, Ni Songyuan, Guo Chen, Chen Mingxu, Quan Hongzhu

机构信息

College of Civil Engineering & Architecture, Qingdao Agricultural University, Qingdao 266109, China.

出版信息

Materials (Basel). 2022 Sep 2;15(17):6117. doi: 10.3390/ma15176117.

DOI:10.3390/ma15176117
PMID:36079498
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9457536/
Abstract

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.

摘要

由再生骨料制备的人工鱼礁生物附着性较差，限制了其在海洋工程领域的应用。本研究以废弃牡蛎壳为原料制备再生骨料多孔混凝土，测试了其抗压强度、劈裂抗拉强度、抗氯离子渗透性能、抗冻融性能、耐低温性能及生物附着性，旨在提高生物附着性并减少二氧化碳排放。实验结果表明，使用废弃牡蛎壳会降低抗压强度和劈裂抗拉强度，但设计的多孔结构对力学强度的影响高于废弃牡蛎壳。为确保再生骨料多孔混凝土的耐久性，废弃牡蛎壳的含量不应超过20%。此外，废弃牡蛎壳的添加和设计的多孔结构有利于生物附着。然而，再生骨料多孔混凝土的多孔结构仅在短期内改善生物附着，长期来看则相反。当废弃牡蛎壳替代水泥的比例为40%时，二氧化碳总排放量减少约52%。总之，在再生骨料多孔混凝土中使用废弃牡蛎壳是一种生态友好的方法，可改善人工鱼礁的生态附着性并减少二氧化碳排放。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4b04/9457536/dd0c530d65b2/materials-15-06117-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4b04/9457536/2c291e7c8a71/materials-15-06117-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4b04/9457536/c465b68ff260/materials-15-06117-g011.jpg
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