Abstract
Owing to ettringite reaction, the ash from a coal-fired fluid bed combustion boiler turns into a strong solid brick after it is kneaded with water. We tried to utilize it as a road-base material. The process consists of reducing ash grain size by means of a crusher, measuring, mixing with water, kneading, molding, curing at 60°C after aging a little while at the room temperature, and then crushing. We organized a project team for the research and development activities consisting of the Foundation Center for Coal Utilization as an organizer, Kawasaki Heavy Industries Co., Ltd. for the basic research, Naruto Salt Manufacturing Co., Ltd. for the pilot plant (manufacturing road-base material) test, and Nippon Hodo Co., Ltd. for the assessment of product material. The road-base material product has proved to be safe for the environment, meeting asphalt pavement standards, and is good for road construction work and practically durable for heavy traffic.
