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글라스 버블을 사용한 자기 충전 콘크리트의 레올로지 특성에 관한 연구
이한용 ( Lee Han-yong ),윤섭 ( Yoon Seob ),서태석 ( Seo Tae-seok ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2
In this study, unlike high flowing concrete, using glass bubble to develop self-compacting concrete(hereinafter referred to as "SCC") with excellent filler performance by evaluating both flowability and yield stress, viscosity An experiment was conducted. Experimental results show that when 1 kg of glass bubbles are used, it is effective in stabilizing the physical properties of concrete, reducing the yield stress and viscosity.
고강도 콘크리트 고온양생 방법의 압축강도 특성에 관한 실험적 연구
이한용(Lee, Han-Yong),남경용(Nam, Kyung-Yong),하정수(Ha, Jung-Soo),임남기(Lim, Nam-Gi) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.10
Greater emphasis is given to the reduced period of construction and the performance of concrete following recent trend of high-rise and large-sized buildings. Especially, the focus is on the management of concrete quality in the early stages regarding reduced construction period. Domestic and foreign studies have already examined the technique of accelerating the hardness to check the quality of the concrete in a short period of time such as hot water curing and microwave irradiation as a method to check the concrete quality in the early stage. However, there are not many studies that considered such techniques on ultra-high strength concrete. To examine ultra-high strength concrete, tests were conducted on following settings: W/B 20.7%, 80MPa strength for unit quantity 155kg/㎡, and curing in hot water heated to 20, 40, 60, and 80℃ using curing water tank. Three specimens were produced for each age and the mean value was taken for compression strength to reduce error, and mock-up specimens (column, wall) were produced, the core was extracted using KS F 2422 (Method of Obtaining and Testing Drilled Cores and Sawed Beams of Concrete) for the comparison with heated specimen for each age, and the compression strength was measured three times for each age to review field applicability. Also, it appeared that the distribution of pores and hydration products which appears to have impact on the concrete strength was not fully considered, and therefore, the generation and distribution of micropores were observed using mercury intrusion porosimeter and the distribution of microtissue was observed using scanning electron microscope (SEM) to increase the accuracy of the test.