Recycling of waste spent catalyst in road construction and masonry blocks

► Waste spent catalyst consists primarily of silicates and aluminates. ► Stabilization of waste spent catalyst will yield high compressive strength to qualify as a stabilized road subbase or base material. ► Blending raw spent catalyst with other virgin aggregates could be utilized in road base and subbase construction. ► Spent catalysts, used as a partial cement replacement or as a cementitious additive, could be utilized in masonry blocks construction. ► No negative environmental impact is anticipated from the use of waste spent catalyst in construction.