Title: Mechanical Properties And Durability Aspects of High- Volume Fly Ash Porous Concretes

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Publication: CIA

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Date: 2/13/2011

Abstract:
Environmentally friendly porous concrete has been increasingly applied in concrete structures in river or seashore in Japan. From the viewpoint of biological habitat existence, the porous concrete is required to have a lower calcium hydroxide content and a continuous pore structure. For this purpose, high-volume fly ash porous concrete with the replacement percentage of cement by fly ash of 25% and 50 % was investigated. Also, two different types of aggregates, crushed quartzite stone and crushed green tuff one, were used for making the porous concrete. From the results of the experiment, it was clarified that the high replacement percentage of cement by fly ash in porous concretes was effective in increasing the compressive strength at long-term ages, and in decreasing the content of calcium hydroxide due to the pozzolanic reaction of fly ashes. Furthermore, it was confirmed based on the results of exposure test at seashore that the high replacement percentage of cement by fly ash could also improve the resistance of porous concrete to the seawater attack to a significant degree.