01338017

Component

https://doi.org/10.3141/2253-06

http://scholar.google.com...alid&publication_year=2011

Before incinerator bottom ash waste (IBAW) is used as a construction material, its environmental impacts should be thoroughly investigated. IBAW encompasses ferrous and nonferrous constituents that, in the presence of water, might be released into the groundwater and soil. The aim of this study was to find a treatment technique to improve the quality of IBAW and to reduce, to below regulatory limits, its potential to leach metals and salts. IBAW was mixed with limestone to achieve an environmentally and functionally acceptable blend to be used as a road foundation layer. The research studied the leaching characteristics of some constituents—including sulfate, chloride, sodium, copper, zinc, and lead—in IBAW blends under different conditions, such as initial pH value and the use of novel and traditional treatment agents. The experimental program was designed to recreate a realistic environment; a lysimeter was used as a large-scale leaching tool and a laboratory protocol was developed that simulated road foundation field conditions to evaluate the long-term release of heavy metals and salts from IBAW. In the lysimeter experiments, the concentrations of the leached elements were monitored through a sand substrate underneath the IBAW layer to study the potential element migration and sorption process. Mathematical modeling was then used to simulate the release of the aforementioned constituents from the IBAW on the basis of the initial measurement of intrinsic material properties and the sorption process concept. The experimental results showed that the additive treatment had a varied impact on the IBAW blends’ leaching properties, as element release was reduced by a wide margin, ranging from 5% to 96%.

01358796

11-0075

English

pp 51-59

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309222891

Print

Figures (8) ; Photos (1) ; References (21) ; Tables (2)

Bottom ash; Environmental impacts; Heavy metals; Leaching; Limestone; Numerical analysis; Pollutants; Salts; Simulation; Sorption

Lysimeters

Environment; Highways; Materials; Pavements; I15: Environment; I33: Other Materials used in Pavement Layers

TRIS, TRB, ATRI

Feb 17 2011 5:19PM

• Assessing the Compactability of Recycled Concrete Aggregate
• Assessment of Corrosion Potential of Coarse Backfill Aggregates for Mechanically Stabilized Earth Walls
• Early-Age Structural Properties of Base Material Treated with Asphalt Emulsion (With Discussion and Closure)
• Forensic Investigation of Distressed Pavement Supported on a Base Course Containing Recycled Concrete Aggregate
• Performance of Continuously Reinforced Concrete Pavement Containing Recycled Concrete Aggregates
• Reliability-Based Design of Mechanically Stabilized Earth: Fill Properties and Variable Metal Loss
• Time-Dependent Structural Response of Full-Depth Reclamation