STUDY ON MIXTURE PROPORTIONS AND CASTING METHOD OF POROUS CONCRETE WITH THE SHELL

摘要

To develop the porous concrete using the shell which has been discarded numerously as industrial wastes, several kinds of admixtures were applied to secure the bond between mortar and scallop having the smooth inside. The strength of the shell porous concrete was considered to be affected by the bond strength of the mortar, while it was also confirmed little influenced by the bond strength when the latter exceeded the strength of shell itself. Also, the compressive strength and the void ratio of the shell porous concrete using the shell blended with crushed stone were examined. The more the blending ratio of crushed stone with shell, the compressive strength and the void ratio increased. However, void ratio decreased when the blending percentage of that exceeded a constant value. The shell porous concrete had high strength and void ratio when constant fluidity and bond strength of mortar are secured without vibration. The concrete product using scallop shell having required strength could be manufactured by casting simultaneously with normal concrete.