Sequestering Lead in Paint by Utilizing Deconstructed Masonry Materials as Recycled Aggregate in Concrete. Revision 1

摘要

A systematic study has been conducted to establish a rational mix design method for proportioning concrete utilizing recycled, lead-contaminated aggregate for field construction. A variety of concrete mixes were made with different aggregates, cements, and mixture proportions. The physical properties and lead leachability of the aggregates were characterized. The concrete workability, strength, and lead sequestration were evaluated. Eight mix design nomographs were developed. A cost analysis was conducted for hypothetical buildings under different disposal scenarios. The results showed that when appropriately designed and processed, concretes made with recycled, LBP- contaminated aggregates have physical properties that are satisfactory for a variety of constructions. Portland cement can effectively sequester LBP in the recycled aggregate because of it high alkalinity. These successful research results can significantly reduce the cost and environmental impact of Department of Defense (DoD) construction and deconstruction projects.