Development of a nature-inspired polymeric fiber (BioFiber) for advanced delivery of self-healing agents into concrete
Development of a nature-inspired polymeric fiber (BioFiber) for advanced delivery of self-healing agents into concrete
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DOI：
10.1016/j.conbuildmat.2023.133765
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发表时间：
2023-10-17
影响因子：
7.4
通讯作者：
Farnam，Yaghoob (Amir)
中科院分区：
文献类型：
--
作者：
Khaneghahi，Mohammad Houshmand;Kamireddi，Divya;Farnam，Yaghoob (Amir)
在这项研究中，我们开发了受自然启发的多功能聚合物纤维(称为生物纤维)，将生物自愈剂输送到胶凝材料中。生物纤维是由承载核心纤维、内含孢子的水凝胶鞘和外部损伤响应聚合物壳层制造而成。这种创新的生物纤维将三个关键功能集成到准脆性基质中：(I)自主生物自我修复，(Ii)裂纹扩展控制，以及(Iii)损伤响应。水凝胶鞘含有作为生物制剂的内孢子，以建立微生物诱导的碳酸钙沉淀(MICCP)作为自我愈合的最终产品。芯纤维为准脆性工程材料提供了裂纹扩展控制功能。此外，外壳涂层在混凝土中集成了强大的损伤响应自修复激活策略。进行了全面的参数研究，以探索材料选择和影响参数，以定制开发的生物纤维的加工组成结构性能。这项研究的结果表明，8w/v的海藻酸钠与醋酸钙交联可提供更高的MICCP所需的溶液吸收能力。在壳层方面，聚苯乙烯和聚乳酸(1：1wt%)的聚合物共混物，聚合物/溶剂比为18w/v-单层涂料，在模拟混凝土浇注过程中有效地保护了生物纤维。最后，每个生物纤维能够在激活的前30小时内产生40-80毫克的碳酸钙。
In this study, we developed nature-inspired multi-functional polymeric fibers (called BioFiber) to deliver bio-self-healing agents into cementitious materials. BioFibers were manufactured using a load-bearing core-fiber, a sheath of endospore-laden hydrogel, and an outer damage-responsive polymeric shell layer. The innovative BioFiber integrates three key functionalities into the quasi-brittle matrix: (i) autonomous bio-self-healing, (ii) crack growth control, and (iii) damage-responsiveness. The hydrogel sheath contained endospores, as bio-agents, to establish microbially-induced calcium carbonate precipitation (MICCP) as a self-healing end-product. The core-fibers provided crack growth control functionality into quasi-brittle engineering materials. Additionally, the outer shell coating integrated a robust damage-responsive self-healing activation strategy in concrete. A comprehensive parametric study was conducted to explore material options and the influential parameters for tailoring the processing-compositions-structure properties of the developed BioFiber. The findings of this study revealed that a concentration of 8 w/v sodium-alginate crosslinked with calcium acetate provided higher solution uptake capacity required for MICCP. As for the shell, the polymer blend of polystyrene and polylactic acid (1:1 wt%), with polymer/solvent ratio of 18 w/v-single layer coating, effectively protected BioFibers during simulated concrete casting process. Lastly, each BioFiber was able to produce 40–80 mg of calcium carbonate within the first 30 h of activation.