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Ecology Publications & Forms |
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Ecology Publications & Forms |
| Title | Recycled Concrete Aggregate Leachate: A Literature Review |
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| VIEW NOW |
Recycled Concrete Aggregate Leachate: A Literature Review (Number of pages: 139) (Publication Size: 3307KB)
APPENDICES A & B (16 pages) (362KB)
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| Author(s) | Daiber, E. | ||||
| Description | Concrete is a hydrated, hardened composite of cementitious paste and aggregates (sand, gravel, and/or crushed stone). Modern-day concrete structures are generally demolished after 50 to 100 years. The storage of large quantities of deconstructed concrete material may pose environmental risks unless the recycled concrete aggregate (RCA) leachate is properly managed and treated, as well as best management practices are correctly applied. These environmental risks are commonly characterized by laboratory leaching methods (e.g., batch or column methods) that may fail to include important physical and chemical parameters or processes occurring in the field. Despite the discrepancy between the laboratory and field leaching, batch laboratory leaching methods have proven to be consistent, inexpensive, and simple for regulators, researchers, and facility site managers to implement for evaluation of a material’s potential environmental impact. Freshly crushed, non-carbonated concrete material is extremely alkaline, with a pH upwards of 13 standard units. The concrete material pH is inversely related to the materials’ degree of carbonation (i.e. fully-carbonated RCA leachate produces a near-neutral pH). Concrete’s alkaline pH may be neutralized depending on the site-specific conditions. We identified several inorganic and organic pollutants of potential environmental concern. The State Department of Ecology encourages the reuse of concrete material to preserve virgin aggregate sources, reduce greenhouse gas emissions, and lessen the disposal in landfills, as well as for economic reasons. Concrete recycling process controls must be monitored to ensure environmental risks are minimized, while retaining the net benefits of concrete recycling. |
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The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.
ADA Accessibility The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188. Visit Ecology’s website for more information. |
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| Contact | Eric Daiber at 360-407-6764 or Eric.Daiber@ecy.wa.gov | ||||
| Keywords | alkaline pH, leachate, RCA, recycled concrete aggregate, concrete | ||||
| RELATED PUBLICATIONS | Title:
Focus on: Statewide Effluent Characterzation Concrete Manufacturing and Recycling Concrete Manufacturing and/or Recycling: Statewide Effluent Characterization |
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