Development of a lightweight epoxy asphalt mixture for bridge decks

A lightweight epoxy asphalt mixture (LEAM) was developed by replacing part of the basalt aggregate in an epoxy asphalt mixture with lightweight aggregate. These mixtures were evaluated as alternative to basalt mixes for deck paving of the TianJin bascule bridge in China. Nine different types of LEAM with varying lightweight aggregate shapes and percentages were designed and tested. The results indicated significant variations in performance. This approach was deemed viable based on FEM analyses that indicated significant stress reductions using lightweight material. Based on the findings it is recommended that a LEAM with 70% rounded lightweight aggregate be used to reduce the deadweight of the deck paving and optimize performance in terms of rutting and cracking resistance.