Researchers have proposed the idea of incorporating single-use masks from the pandemic into a cement mixture to create stronger concrete. Disposable masks can be left in the environment for many decades, posing a threat to the ecosystem if they are not recycled.
Washington State University released a press release stating that researchers found that the mixture of mask materials and cement was 47% stronger after a month of curing in a paper published in Materials Letters.
Cement production is a high-carbon process that contributes to 8% of global carbon emissions. Concrete reinforced with microfibres may reduce the amount required for a project and make it last longer. This can save carbon emissions as well. Concrete industry can benefit from the fibres found in medical masks.
These waste masks actually could be a valuable commodity if you process them properly… This work showcases one technology to divert the used masks from the waste stream to a high-value application, the release quoted the papers corresponding author Xianming Shi, professor of civil and environmental engineering, as saying.
Researchers developed a method to make tiny mask fibres that range from 5 to 30 millimeters in length. They then added them to cement concrete to strengthen it, and prevent it from cracking. They removed the metal and cotton loops and cut them up, and then incorporated them into regular Portland cement. The mask microfibres were then mixed into a solution containing graphene oxide. This was then added to the cement paste. The release stated that concrete cracks would eventually become larger and cause materials failure.
Researchers are continuing to study the possibility that graphene oxide-treated microfibres could improve concrete’s durability and protect it against frost damage. They also envisage using this technology to recycle other polymer material, such as discarded clothes, to encourage collection.
Zhipeng Li (a graduate student in WSU’s Department of Civil and Environmental Engineering) led the study. The study was funded by the US Department of Transportations National Center for Transportation Infrastructure Durability and Life Extension.
STUDY:Recycling of waste mask PP microfibers Portland cement paste: Surface Treatment by graphene Oxide, Zhipeng Li et.al. Materials Letters, 2022. doi.org/10.1016/j.matlet.2022.132238
Source: Washington State University
