TEMPORAL CHANGE IN COMPRESSIVE BEHAVIOR OF POROUS CONCRETE UNDER LONG-TERM DRY-WET CYCLIC EXPOSURE

Abstract

This study aimed at investigating deterioration resistance of porous concrete, which is assumed to be utilized as a component for rooftop gardening, under dry-wet cyclic exposure. Experimental investigations were conducted regarding temporal change in compressive behavior（compressive strength, Young’s modulus, strain at compressive strength, and n value in the Popovics equation）of porous concrete under dry-wet cyclic accelerated exposure test, in which the temperature conditions were more severe and the drying conditions were more loose than those standardized by the Japan Concrete Institute. As a result, it was shown that the compressive behavior of porous concrete did not remarkably decline under dry-wet cyclic exposure for almost four years（1,457days）. However, it should be noted that the compressive behavior of porous concrete is more sensitive to experimental conditions than those of normal concrete, because of its structure in which the coarse aggregates are covered/bonded by thin cement paste phase.