RCA and shredded face masks (IMAGE) RMIT University Caption The new material blends recycled concrete aggregate (left) and small strips of shredded disposable face masks (right). Credit RMIT University Usage Restrictions Credit RMIT University License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.