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정상국 ( Jung¸ Sang-kug ),이창학 ( Lee¸ Chang-hag ),심태섭 ( Shim¸ Tae-sup ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
As recently construction technology is developed, concrete materials ae applied to high-storied building, long and grand bridge, huge dam and deep sea structures and the properties required for general concrete have been diversified and highly performed and then the research of high strength concrete has been done actively as the means of improving the quality of concrete. The limit in manufacturing concrete of high performance with conventional method using water, cement and aggregate is recognized and silica fume of pozzolan quality with fly ash has been noted as the mixing materials which improve the strength and quality of concrete greatly and the profound researches of it have been conducted. Accordingly, this study applies silica fume to steel fiber reinforced shoterete, one of reinforce of tunnel, according to rapid increase of the construction of tunnel, expressway, rapid-transit railroad and urban subway with the introduction of NATM technique and then aims at confirming the potential of improving the property of high strength SFRS like high strength concrete.
정상국 ( Jung Sang-kug ),이창학 ( Lee Chang-hag ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
The recent trend shows that the aspect ratio of steel fiber, the auxiliary material of steel fiber reinforced shotcrete in the construction work ordered in domestic market is designed greatly. Therefore this study compares and analyzes the physical properties (compression, flexural strength and flexural toughness) according to the aspect ratios of steel fiber with φ 7 x 35 mm which was applied to conventional designs and that of φ 0.5 x 30mm which is applied in recent designs through inner and outdoor experiment and is to present the helpful applications of steel fiber for the future construction work.