부산대학교 도서관

Artificial aggregates have been investigated in various composite materials as a green alternative but most studies evaluate strength or function separately. Here, we propose a concept of meta-aggregate to balance the strength and permeability of concrete composite. Specifically, we exploit strut-based lattice metamaterials made from recycled PLA as artificial aggregates in cementitious and asphalt matrix to create meta-aggregate permeable concrete (MPC) and meta-aggregate permeable asphalt mixture (MPA). Our experimental results indicated that compared with the control unit, the average permeability of MPC units increased by 129 % and the compressive strength decreased by 29 %, while the permeability of MPA units increased by 142 % and the tensile strength was similar. The changes in strength and function come from the geometric form and size of the meta-aggregate. Our study suggests that the proposed meta-aggregates have great potential as programmable, sustainable, and multifunctional components in next-generation composites.