Microstructural investigation of mortars incorporating cockle shell and waste fishing net

Chung, Sang-Yeop; Oh, Seo-Eun; Jo, Su-Sung; Lehmann, Christian; Won, Jonghwa; Elrahman, Mohamed Abd

doi:10.1016/j.cscm.2022.e01719

Cited by 1 publication

(1 citation statement)

References 27 publications

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“…In contrast, the positive control concrete (GO), which incorporated seashells, exhibited a bacterial community comparable to that of seawater and P(3HB)-coated concrete. The presence of seashells in the green concrete contributed to its increased surface roughness and micro-scale porous complexity, creating favourable conditions for biofilm formation [ 66 – 68 ]. The higher surface area and irregularities on the GO samples provided protection, facilitated the attachment and growth of biofilm-forming microorganisms, leading to a visually prominent biofilm coverage [ 69 , 70 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of poly(3-hydroxybutyrate) [P(3HB)] coating on the bacterial communities of artificial structures

Chai,

Syauqi,

Sudesh

et al. 2024

PLoS ONE

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The expanding urbanization of coastal areas has led to increased ocean sprawl, which has had both physical and chemical adverse effects on marine and coastal ecosystems. To maintain the health and functionality of these ecosystems, it is imperative to develop effective solutions. One such solution involves the use of biodegradable polymers as bioactive coatings to enhance the bioreceptivity of marine and coastal infrastructures. Our study aimed to explore two main objectives: (1) investigate PHA-degrading bacteria on polymer-coated surfaces and in surrounding seawater, and (2) comparing biofilm colonization between surfaces with and without the polymer coating. We applied poly(3-hydroxybutyrate) [P(3HB)) coatings on concrete surfaces at concentrations of 1% and 6% w/v, with varying numbers of coating cycles (1, 3, and 6). Our findings revealed that the addition of P(3HB) indeed promoted accelerated biofilm growth on the coated surfaces, resulting in an occupied area approximately 50% to 100% larger than that observed in the negative control. This indicates a remarkable enhancement, with the biofilm expanding at a rate roughly 1.5 to 2 times faster than the untreated surfaces. We observed noteworthy distinctions in biofilm growth patterns based on varying concentration and number of coating cycles. Interestingly, treatments with low concentration and high coating cycles exhibited comparable biofilm enhancements to those with high concentrations and low coating cycles. Further investigation into the bacterial communities responsible for the degradation of P(3HB) coatings identified mostly common and widespread strains but found no relation between the concentration and coating cycles. Nevertheless, this microbial degradation process was found to be highly efficient, manifesting noticeable effects within a single month. While these initial findings are promising, it’s essential to conduct tests under natural conditions to validate the applicability of this approach. Nonetheless, our study represents a novel and bio-based ecological engineering strategy for enhancing the bioreceptivity of marine and coastal structures.

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