SPONSOR: MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY
PI: Qingli Dai
The reuse of scrap rubbers in Portland cement concrete has attracted many interests of researchers and practitioners in the recent decade. These practical efforts can reduce the environmental impact and save energy and resources for cement and aggregate production. In addition, the rubber-modified cement concrete have improved mechanical features, reduced weight, increased durability and toughness and decreased brittleness. Especially, the mixed crumb rubbers will introduce the uniformly distributed “elastic particles”, which have similar size-distribution as the air-entrained air voids to reduce internal stress for the improved freeze-thaw durability. In addition, the “green” geopolymer cement will be specially prepared by using alkali-activated reaction of fly ash and recycled glass powder for reduced CO2 emission and improved durability.
This project will develop a two-stage treatment approach for rubber particles to increase the material stiffness and rubber cement or geopolymer paste bonding strength. The developed techniques will facilitate the utilization of scrap rubber as fine particles in Portland cement and geopolymer concrete.