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Improve thermal insulated in structure of building and examination of development existing material of material that can improve performance of structure is required.There is expanded perlite that is having special quality suitable material to be used for composition material of building in various characteristic such as lightweight, incombustible, thermal insulation, sound absorption in this research.But, is used circumscriptively. Therefore, was going to apply to concrete and estimate the performance. Hereafter, I wished to recognize about practical use of expanded perlite as insulating lightweight concrete aggregate.Result that execute a concrete experiment that use in fine aggregate is as following.