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Compression Index and Small Strain Stiffness of Six Coal Bottom Ashes in South Korea
추현욱,Linh Van Ngo,김태기,김영상,이창호 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.12
This study investigates the small strain stiffness (Gmax) of six coal bottom ashes in South Korea. One-dimensional compression tests using an instrumented oedometer cell were performed to measure the shear wave velocity (Vs), and the compression indices (Cc) of the six different bottom ashes were also explored in this study. The results demonstrate that, at low confinement, the Cc of bottom ashes are comparable to that of sand under a similar void ratio. However, at high confinement, the bottom ash shows very high Cc compared to sand due to the crushability of the weak and porous bottom ash particles upon confinement. The variations of α and β, which are Vs parameters (i.e., Vs = α (σ´m/1 kPa)β ), with different Ccvalues of the tested bottom ashes are consistent with the existing empirical relationship. The Gmax of tested bottom ashes can be adequately captured by the existing Gmax estimating formula for angular sand, indicating that the Gmax of bottom ash is highly comparable to that of sand with a similar void ratio and confining stress.
공동주택 지하주차장의 조명설비 실태 및 운용기법에 따른 성능분석 연구
추현욱,김곤,김정태 대한건축학회 1999 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.19 No.2
The purpose of the study is to provide the Sighting design guideline of underground parking space in terms of quantative and qualitative visual environment. For the purpose, nighttime light levels in 5 parking spaces have been measured and questionnaire survey on the occupants have been performed. Based on the field survey, computer simulation models have been established. And then, through the simulation, lighting performance on the basis of the variation in the candle ratio of light source has been evaluated. The results are as follows : ① From the measurement, average illumination of underground parking is 23 lux. ② Average illumination is 91.7 lux when the unit power density is 1.428W/㎡. ③ Average illumination is 74.6 lux when the unit power density is 0.952W/㎡. ④ The analysis of the simulation reveals that average illumination, 49.62 lux, can be achieved when the unit power density is 0.793W/㎡.