Properties of High-Strength Porous Concrete

Abstract

A new method of producing high-strength porous concrete has recently been developed in Japan. In this method, porous concrete is produced by coating the coarse aggregates with a high-strength mortar, then applying vibration to fuse them. Porous concrete produced by this method has the following properties. It has a continuous void system with a volume-to-total-void ratio exceeding 85% and a compressive strength of 20 MPa or greater when water permeability is 2 cm/sec. The porous concrete produced exhibited good durability in freezing and thawing tests (ASTM C666, Procedure B) and, while the amount of drying shrinkage is about 60%, or smaller than that of conventional concrete, such shrinkage occurred very rapidly.