In recent years, various kinds of aggregates are being developed for the purpose of resources recovery of solid waste. Generally, these types aggregates contain microscopic porosity in these matrixes. These aggregates show many different properties comparing with conventional artificial lightweight aggregate, such as chemical composition, manufacturing process, internal structure and external surface structure and external surface, textures. Variation of properties, density, absorption, strength, etc of porous aggregate are caused by reasons above-mentioned. According to our series studies, it was observed that properties of porous aggregate, density, absorption, strength, etc can be evaluated by porosity as common index, and porosity has a high correlation with three properties. Based on the past above investigation, this study was carried out in these experimental series. Series I : Characteristic of porous aggregate Series II : Correlation of porosity and mechanical properties of mortar and concrete containing porous aggregate. Series III : Correlation of porosity and mechanical properties of mortar and concrete containing normal aggregate and porous aggregate. Volume and radius of porosity, density, absorption, strength of aggregate in series I, volume of porosity, density, compressive strength, Young's Modulus of mortar in series II, volume of porosity, density, compressive strength, Young's Modulus of concrete in series III were measured respectively. Porosity of aggregate, mortar and concrete, density, compressive strength, and young's modulus are measured.
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