Scientists have illustrated the concept of incorporating old masks into a cement mixture to make stronger and more durable concrete. This has coincided with the widespread use of single-use masks during the pandemic which has caused severe environmental issues.
WSU研究人员开发了一个制造微小面膜纤维的工艺，长度从5到30毫米，然后将其添加到水泥混凝土中以增强并防止其开裂。图片来源：华盛顿州立大学
在期刊报道的一项研究中欧洲杯足球竞彩材料信，来自华盛顿州立大学已经表明，使用蒙版材料的混合物比一月的固化后通常使用的水泥强约47％。欧洲杯足球竞彩
如果您正确处理这些废物，这些废物实际上可能是一种有价值的商品.I’m always looking out for waste streams, and my first reaction is ‘how do I turn that into something usable in concrete or asphalt?’
华盛顿州立大学民用与环境工程系临时主席的研究对应作者兼教授Xianming Shi
Cement production is considered to be a carbon-intensive process, accountable for as much as 8% of carbon emissions throughout the world. Microfibers are sometimes added to cement concrete to reinforce it. However, they are costly.
超细纤维增强混凝土可能有助于减少项目所需的水泥量或使混凝土持续更长的时间，从而节省碳排放量以及所有者和建筑商的资金。
Medical masks consist of fibers that could be beneficial for the concrete industry, as they are made of polyester fabric or polypropylene where the material contacts the skin and an ultra-fine polypropylene fiber for the filtering layers. If they are not used again, disposable masks could remain in the environment for decades and pose a threat to the ecosystem.
这项工作展示了一项技术，将用过的面具从废物流转移到高价值应用程序.
华盛顿州立大学民用与环境工程系临时主席的研究对应作者兼教授Xianming Shi
In their proof-of-concept study, the scientists came up with a process to fabricate small mask fibers. This ranges from 5–30 mm in length and is then added to cement concrete to reinforce it and avoid its cracking.
While their testing was performed, they eliminated the metal and cotton loops from the masks, cut them up and integrated them into ordinary Portland cement. This is considered to be the most common type of cement that has been utilized throughout the world, and the basic ingredient for mortar, concrete and grout.
在将混合物添加到水泥糊之前之前，科学家将面膜超纤维混合到氧化石墨烯的溶液中。氧化石墨烯提供的超薄层强烈粘在纤维表面上。
这些面膜微纤维倾向于吸收或消散裂缝能量，从而加起来混凝土中的小裂缝。在没有纤维的情况下，这种微观裂纹最终会导致更广泛的裂纹和材料的故障。
研究人员已经进行了许多研究，以测试他们的概念，即经过氧化石墨烯处理的超细纤维也可以帮助提高混凝土的耐用性，并保护其免受霜冻损害和免受道路上使用的化学化学物质的影响。
此外，研究人员预计，采用这项技术在其他聚合物材料（如废弃服装）的回收中，以激励收集此类废物。欧洲杯足球竞彩
Zhipeng Li, a graduate student in WSU’s Department of Civil and Environmental Engineering, headed the work. It was financially supported by the U.S. Department of Transportation’s National Center for Transportation Infrastructure Durability and Life Extension.
Journal Reference:
Li, Z.,等. (2022) Upcycling waste mask PP microfibers in portland cement paste: Surface treatment by graphene oxide.欧洲杯足球竞彩材料信.doi.org/10.1016/j.matlet.2022.132238.
来源：https://wsu.edu/