STUDY ON POROUS CONCRETE USING ORDINARY PORTLAND CEMENT FOR EARLY TRAFFIC OPENING

Abstract

In Japan, the use of concrete pavements gradually decreased since the 1960s owing to the fact that they require some days to cure. However, recent research revealed that concrete pavements are effective for the Life Cycle Cost and the heat island phenomenon. A novel method of making concrete pavements, with which the traffic can be opened after only one-day curing, has been proposed in Japan. Furthermore, authors have developed porous concrete for road pavement, which can also cure in one day. This study proposes a new design method to reduce the production cost of porous concrete. To achieve this, the high early-strength Portland cement was replaced with ordinary Portland cement and coarse aggregate of various sizes with a single-sized coarse aggregate. Various tests revealed that the concrete prepared by the proposed design method satisfies the standard values of the bending strength and the permeability coefficient for concrete pavement for early traffic opening. Therefore, it is considered that the design method proposed herein is vital in reducing the cost of porous concrete pavements.