Houston expands runway for Boeing 747s with fly‑ash and slag concrete
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- George Bush Intercontinental Airport opened runway 15R‑33L to air traffic on June 13, 2002 after a $100 million upgrade that extended the pavement to 10,000 feet long and 150 feet wide for Boeing 747 operations.
- The new 19‑inch concrete overlay, covering about 300,000 square yards, used a mix of 50 % Type I Portland cement, 25 % Class F fly ash and 25 % Grade 120 blast‑furnace slag; trial slabs reached 800 psi flexural strength at 90 days and core compressive strengths of 6,730 to 9,790 psi after roughly eight months of service.
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