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규산나트륨을 알칼리 자극제로 사용한 알칼리 활성 슬래그 콘크리트의 강도 특성
송진규(Song Jin-Kyu),이강석(Lee Kang-Seok),양근혁(Yang Keun-Hyeok),한선애(Han Sun-Ae) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
This study investigated the strength development of alkali-activated slag concrete, which used ground granulated blast furnace slag(GGBS) as a source material, based on the mix proportions for alkali activated(AA) mortar from previous research. Alkali-activated slag concrete exhibited excellent early strength development, and the strength was about 1.5 to 3 times higher than ordinary portland cement(OPC) at age 1day and 3days. As strength property with mixing condition, the compressive strength was higher as water-to-binder(W/B) ratio was lower. Although the early strength was higher as the value of alkali quality coefficient QA was higher, the relationship did not continue in the long-term age. The equation proposed from investigation of AA mortar was applied to alkali-activated slag concrete with a slight modification and without additional variable analysis process, and the compressive strength predicted by this modified equation at 28days corresponded well with experimental results.
노후도를 고려한 학교건물의 내진성능평가 및 내진보강에 관한 연구
송진규(Song Jin-Kyu),황재승(Hwang Jae-Seung),김건우(Kim Geon-Woo),송호범(Song Ho-Beom),이재혁(Lee Jae-Hyeok) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.8
The purposes of this paper is to demonstrate seismic performance evaluation procedure and seismic retrofit measures for an aseimic school building structure. The concept of deterioration is applied on the assessments of 1st seismic performance evaluation and performance reduction factor of in the 2nd seismic performance evaluation. The total assessments score of `1st evaluation was 0.84(grade D) which means the building needs to improve seismic performance by retrofitting. As a result of 2nd evaluation, columns are unsteady on the earthquakes with 200 year recurrence period, and it could not perform collapse prevention level with 1000 year recurrence period. Also, the effective response modification coefficient was quite less than criteria of KBC 2009. For retrofitting this building, damper was installed for improving system damping, and brace was set for enhancing strength and stiffness. Numerical results show that, all members was not destroyed and the effective response modification coefficient was larger than criteria of KBC 2009 as well.