Newark Airport runway base with coal ash remains functional after 20 years
Based on · First reported
Sources
- In the 1970s engineers at Newark International Airport incorporated coal ash into a stabilized concrete base beneath runway surfaces, using about 10% to 12% coal ash together with 3% to 4% calcium and Portland cement, forming a layer 24 to 36 inches thick.
- The resulting base achieved compressive strengths of roughly 2,000 to 2,600 psi (14 to 18 MPa), and a Federal Highway Administration evaluation found the runway sections still functioning satisfactorily after more than two decades of service.
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