Rubble-rubber mix (IMAGE) RMIT University Caption The new material is the first to combine recycled concrete aggregate and scrap tyres in a mix that meets road engineering safety standards. 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.