Application of CFB Fly ash for High Traffic Volume Pavement's Base

摘要

In recent year, the Circulating Fluidized Bed (CFB) Boilers have adopted to build a fossil power plant in Taiwan. Most of the fire petroleum utilizes coke as fuel, which produces more than 1 million tons of fly ashes, and disposed into landfill. The property and behavior of CFB fly ash is different with C type and F type in ASTM C 618. According to CFB fly ashes, it have high content of CaO, which has an own self-cementing property. This research focuses on utilization of CFB fly ash on heavy-load pavement's base layer in industrial park road and state route. The CFB fly ashes were replaced of 30% and 15% grade in various sessions for road test. From the result of Laboratory test, short term pavement performances and underground water qualities are evaluated at the same time. By comparing with the original grade in the lab, the California Bearing Ratio (CBR) Value of grade with 30% and 15% were significantly improved. The mass metal content of CFB fly ash was also below the limit of Environment Protection Agency in Taiwan.