Application for Fly Ash Concrete in Pavement Engineering

When the ordinary concrete is added to fly ash, the slump of concrete is increased and the workability and pumpability are also improved, which can meet the design requirement, reduce project costs, protect environment and save resources. Based on evaluation of the basic performance for raw materials of fly ash concrete, the improved mix design method for fly ash concrete is proposed. And then it is tested in practical project to verify the workability and feasibility and meanwhile some construction attentions are proposed. The results show that the fly ash can significantly improve the workability of cement concrete. The early strength of fly ash concrete is lower than ordinary concrete, but after 28 days, the compressive strength is similar with ordinary concrete, which provides a reference for design and construction of fly ash concrete.