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Indoor air environments for people are recently being observed because the time we spend inside the house or a building throughout the day has been extended during the present circumstances. This is why formaldehyde and volatile organic compounds (VOCs) are regulated, which can cause Sick Building Syndrome (SBS). There might be other VOCs not regulated by law in newly built collective housing, however, in order to compensate for the reduced concentration of regulated VOCs such as benzene, toluene, ethylbenzene, xylene, and styrene. In this study, the concentration of unregulated VOCs in newly built collective housing structures located in the Seoul Special City was researched to find potential indoor hazards for citizens and to prepare basic data for further research.
As a part of efforts for conformity of demand in regard to high quality of concrete, blast-furnace slag has been utilized by means of cement replacement. Superior performance can be ensured, environmental pollution can be prevented and economical advantage can be obtained with utilization by cement placement. But the study on the blast-furnace slag is not systematic and reasonable. So, it is planed that basic data in regard to technique of manufacturing and economic improvement of high quality concrete is showed with experimental comparison and investigation of engineering properties of high quality concrete utilized by cement placement of blast-furnace as industry by-product in this study.