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α형 반수석고를 치환한 모르타르의 응결 및 압축강도, 건조수축 특성
이계혁,김규용,이보경,신경수,남정수,Lee, Kye-Hyouk,Kim, Gyu-Yong,Lee, Bo-Kyeong,Shin, Kyoung-Su,Nam, Jeong-Soo 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 논문집 Vol.21 No.5
${\alpha}$형 반수석고는 생산방법이 복잡하고, 대량 연속 생산이 곤란하며, 재료 단가가 높기 때문에 건설재료로써 활용범위가 크지 않았으나, 최근 화력발전소의 배연탈황석고를 활용하여 경제적으로 ${\alpha}$형 반수석고를 제조하는 기술이 실용화되고 있다. 이에 본 연구에서는 응결 시작 시간이 빠르고 재령 초기 팽창변형이 발생하는 ${\alpha}$형 반수석고의 특징에 주목하여, ${\alpha}$형 반수석고를 10, 20, 30 wt.% 치환한 보통포틀랜드시멘트 및 고로슬래그시멘트 모르타르를 제조한 후 응결 및 압축강도 특성, 건조수축을 검토하였다. 실험 결과, ${\alpha}$형 반수석고의 치환율이 증가할수록 보통포틀랜드시멘트 모르타르 및 고로슬래그시멘트 모르타르의 초결시간이 빨라지는 경향을 확인할 수 있었다. 또한, 보통포틀랜드시멘트 모르타르와 고로슬래그시멘트 모르타르 모두 ${\alpha}$형 반수석고의 치환율이 증가할수록 압축강도가 저하되는 경향을 보였으며, 보통포틀랜드 시멘트보다 고로슬래그시멘트에서 ${\alpha}$형 반수석고의 압축강도 발현이 유리한 것으로 나타났다. 한편, ${\alpha}$형 반수석고를 치환한 모르타르의 경우 ${\alpha}$형 반수석고의 혼입에 의해 생성된 에트링가이트 침상결정의 성장압에 의해 초기재령에서 수축변형이 저감되는 것을 확인할 수 있었으며, 초기 재령에서 수축변형의 억제 효과는 분명하지만, 재령이 지남에 따라 ${\alpha}$형 반수석고를 치환하지 않은 조건과 변형의 차이는 다시 감소하는 경향을 보였다. 따라서 ${\alpha}$형 반수석고를 모르타르에 적용할 경우 강도는 다소 저하하지만, 응결 촉진 및 수축변형 억제에 큰 효과가 있기 때문에 건설재료로써 활용 가치가 높을 것으로 판단된다. In this study, to evaluate the setting time, compressive strength and drying shrinkage of ordinary Portland cement and Portland blast-furnace slag cement mortar with 0, 10, 20, 30 wt.% alpha-calcium sulfate hemihydrate. As a results, as the replacement ratio of alpha-calcium sulfate hemihydrate increased, the initial setting time of ordinary Portland cement and Portland blast-furnace slag cement mortar was faster. In addition, the compressive strength decreased with increasing replacement ratio of alpha-calcium sulfate hemihydrate in both ordinary Portland cement mortar and Portland blast-furnace slag cement mortar. The strength development of Portland blast-furnace slag cement mortar with alpha-calcium sulfate hemihydrate was effective than that of ordinary Portland cement mortar. On the other hand, in the case of the mortar with alpha-calcium sulfate hemihydrate, it was confirmed that shrinkage deformation was reduced at the early age by growth pressure of needle-shaped ettringite crystals produced by incorporation of alpha-calcium sulfate hemihydrate. However, the effect of inhibiting shrinkage deformation of mortar with alpha-calcium sulfate hemihydrate was not significant as the age passed. Therefore, it is considered that the alpha-calcium sulfate hemihydrate is useful as a construction material.
이태규(Lee Tae-Gyu),김규용(Kim Gyu-Yong),민충식(Min Choong-Sic),이계혁(Lee Kye-hyouk),김무한(Kim Moo-han) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.2
It was experimentally investigated in effects of high temperature regarding mechanical properties of concrete. This study is aimed to study the effect of elevated temperatures ranging from 20 to 800℃ on thermal behavior of fiber mixed concrete according to W/C under loading. Tests were conducted on Ø100×200mm cylinder specimens. The specimens were tested under both stressed and unstressed conditions. The specimens were under-loaded to 0%, 33% of their ultimate compressive strength at room temperature.
고온 및 하중 재하조건을 고려한 콘크리트의 역학적 특성 평가
김규용,이태규,민충식,이계혁,남정수,김영선,Kim, Gyu-Yong,Lee, Tae-Gyu,Min, Choong-Siek,Lee, Kye-Hyouk,Nam, Jeong-Soo,Kim, Young-Sun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.3
It was experimentally investigated in effects of high temperature and loading condition on the mechanical properties of concrete. This study is aimed to study the effect of elevated temperatures on mechanical properties of concrete according to compressive strength under loading. Tests were conducted on ${\O}100{\times}200mm$ cylinder specimens, which were tested under both stressed and unstressed conditions by steady-state test. The specimens were under-loaded to 0, 20, 40 percent of their ultimate compressive strength at room temperature and subjected to temperatures ranging from 100 to $700^{\circ}C$, and the residual compressive strength compared to that observed at $20^{\circ}C$. As a result, effect of mechanical properties of concrete at elevated temperature was especially subjected to transient creep more than thermal strain under loading in case of over $500^{\circ}C$.
고온 및 하중 재하조건을 고려한 콘크리트의 역학적 특성 평가
김규용(Kim Gyu-Yong),이태규(Lee Tae-Gyu),민충식(Min Choong-Siek),이계혁(Lee Kye-Hyouk),남정수(Nam Jeong-Soo),김영선(Kim Young-Sun) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.3
It was experimentally investigated in effects of high temperature and loading condition on the mechanical properties of concrete. This study is aimed to study the effect of elevated temperatures on mechanical properties of concrete according to compressive strength under loading. Tests were conducted on Ø100×200㎜ cylinder specimens, which were tested under both stressed and unstressed conditions by steady-state test. The specimens were under-loaded to 0, 20, 40 percent of their ultimate compressive strength at room temperature and subjected to temperatures ranging from 100 to 700℃, and the residual compressive strength compared to that observed at 20℃. As a result, effect of mechanical properties of concrete at elevated temperature was especially subjected to transient creep more than thermal strain under loading in case of over 500℃.