Title: Greener Concrete Using Recycled Materials

Author(s): Tarun R. Naik

Publication: Concrete International

Volume: 24

Issue: 7

Appears on pages(s): 45-49

Keywords:

DOI:

Date: 7/1/2002

Abstract:
Some of the more than 4.5 billion tonnes (5 billion tons) of post-consumer wastes and industrial by-products generated annually in the U.S. are readily recyclable. Within the concrete industry, the most successful examples have been using coal fly ash to make high-quality, durable concrete and recycling old, demolished concrete as aggregates for new concrete. Since the 1990s, other by-products have been successfully used in concrete. These materials include: foundry sand and cupola slag from metal-casting industries; post-consumer glass; wood ash from pulp mills, saw mills, and wood-product manufacturing industries; sludge from primary clarifiers at pulp and paper mills; and de-inking solids from paper-recycling companies.