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양생환경 및 수중펌프압송이 고강도 그라우트의 강도에 미치는 영향
김범휘 ( Kim Beom-hwi ),손다솜 ( Son Da-som ),이종구 ( Yi Chong-ku ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
In recent years, the use of high-strength grout has gained popularity in offshore wind power generation complexes for facility foundations and bridges. These marine wind farms require support for horizontal loads from wind and waves. To ensure the strength of the grout produced in environments similar to the actual placing site, this study investigated the curing of high-strength grout discharged through pump pressure in various environments, and examined the difference in strength according to different variables. Compressive strength measurements revealed that the core specimen collected from the bottom (3cm) and uppermost (50cm) of the specimen exhibited lower strength compared to other height specimens, while the core specimen obtained from the corner exhibited lower strength compared to the center. These findings suggest that the strength difference between the center and the corner is more pronounced when curing at low temperatures. This effect is greater than the strength reduction that typically occurs during low-temperature curing, and thus, necessitates careful attention in similar construction environments.
프라이빗 블록체인 기반 데이터 무결한 스마트 임상시험 관리 시스템
김범휘(Bumhwi Kim),김규형(Kyu Hyung Kim) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
본 논문에서는 프라이빗 블록체인을 활용하여 임상시험에서 발생하는 데이터에 대해서 무결성을 확보할 수 있는 블록체인 기반 스마트 임상시험 관리 시스템을 구현하는 것에 대해 설명한다.
해상환경 및 수중타설이 고강도 그라우트의 역학적 성능에 미치는 영향
김범휘 ( Kim Beom-hwi ),손다솜 ( Son Da-som ),이종구 ( Yi Chong-ku ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
In this study, grout was poured into seawater to confirm the effect of similar marine environment and underwater erosion on the mechanical performance of domestically produced high-performance grout and compared with the existing strength. As a result of the compressive strength measurement, the specimen that simultaneously performed underwater drilling and seawater curing showed slow initial strength expression in both H1 and H2, and from the 7th day, it was confirmed to be within 2% of the existing intensity. It is believed that both grout were caused by disturbance with water during underwater drilling, and the same strength was subsequently shown as the existing strength.
김범휘 ( Kim Beom-hwi ),이종구 ( Yi Chong-ku ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
The use of high-strength grout for facility foundations and bridges has recently been expanding in offshore wind farms. Offshore wind farms require a bearing capacity for horizontal loads such as wind, waves. Therefore, in this study, the strength of the high-strength grout discharged through pump pressure was measured and compared with the existing strength to secure the strength after the underwater pump pressure of the high-strength grout used in the offshore wind connection. The compressive strength measurement showed that the strength difference at each position of the core specimen was 1% higher than that of the other specimens, and there was almost no change in the strength according to the height. The strength of the core specimen decreased by 23% compared to the existing strength, which is similar to the result of this study because the strength of the core specimen decreased by approximately 25% compared to the general specimen according to related research. Therefore, it is believed that there is no decrease in strength due to underwater pumping.
PC계 유동화제가 고강도 그라우트에 유동성 및 강도에 미치는 영향
김범휘 ( Kim Beomhwi ),이종구 ( Yi Chongku ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
The use of high-strength grout applied for facility foundations and bridges has recently been expanding in offshore wind farm. Wind farm in offshore require bearing capacity for horizontal loads such as wind, waves, and earthquakes. In order to improve the bearing force of the base part, sufficient fluidity and a certain strength should be ensured so that the high-strength grout is densely charged in the narrow space of the connection part. Therefore, in this study, changes in fluidity and strength according to the ratio of PC-based superplasticizer mixed in high-strength grout were measured. As a result, as the ratio of the superplasticizer increased, fluidity increased and strength decreased. However, the strength did not decrease when the ratio of superplasticizer was above a 0.005. Therefore, it was confirmed that the fluidity change was remarkable when a 0.005 ratio of PC-based superplasticizer were added.