The study examined the difference in activation by using a container (1cm, 3cm) that was different in height from the other time (3 minutes, 6 minutes, 9 minutes) at the same temperature. The activation time and height of the container do not affect the strength.

The purpose of this study is to compare the compression strength of gypsum substituted mortar with that of mortar. After replacing the cement with the loess, a portion of the remaining cement was replaced with gypsum to make specimens. When the gypsum is replaced, the strength of all the specimens is lower than that of the standard specimen. It is necessary to use a long-term strength mixed material to replace this.

The purpose of this experimental study is to increase the strength of mortar mixed with activated Hwang-Toh (AHT) and granulated blast furnace slag (GGBS) as a compound for the development of eco-friendly concrete. The compressive strength test was carried out by making mortar specimens with a certain ratio of AHT and GGBS. The percentage of AHT were at 30% and 50% and the GGBS were a 40% and 50% as Major variables. The results of this study showed that for specimens with percentage of AHT at 30% with GGBS increased above the strength of the mortar without the binding. However, the compressive strength of experimentation with percentage of AHT at 50% with partially replace GGBS has decreased by more than the mortar without the binding. Therefore, further study is deemed necessary.

According to social needs, eco-friendly material for concrete structures has been developed in recent years. Hwang-toh is one of the eco-friendly architectural material and hwang-toh has been used by partial or complete replacement of portland cement. Four beam specimens with the variations of types of FRP bar (GFRP or CFRP bar) and cement are prepared and tested. From development test, the performance of FRP rebar for PVA fiber reinforced AHC was evaluated.

Research on concrete using activated Hwang-Toh is intensively conducted to protect environment. Therefore, in this study, the effect of activation of Hwang-Toh on strength was investigated through flexural and compressive tests. The specimen made by replacing part of cement with inactivated Hwang-Toh showed strength 55~61% of the control specimen. However, the specimen with activated Hwang-Toh as alternative material indicated load-carrying capacity 76~102% in comparison with the control specimen. Hence, concrete with activated yellow soil can be use in the construction market.

Research on concrete using activated Hwang-Toh is intensively conducted to protect environment. Therefore, in this study, the effect of activation of Hwang-Toh on strength was investigated through flexural and compressive tests. The specimen made by replacing part of cement with inactivated Hwang-Toh showed strength 55~61% of the control specimen. However, the specimen with activated Hwang-Toh as alternative material indicated load-carrying capacity 76~102% in comparison with the control specimen. Hence, concrete with activated yellow soil can be use in the construction market.

최근 친환경 재료와 구조물에 대한 관심이 증대되면서 친환경 재료인 황토에 대한 연구가 활발히 진행되고 있다. 황토는 건설 및 마감 재료로 사용된 전통적인 친환경 건설 재료 중의 하나이다. 황토는 높은 축열성, 습도 조절 능력, 자정력, 탈취 및 항균성능, 인체에 유익한 다량의 원적외선이 방사되는 점 등 건설 재료로서 많은 장점을 갖고 있다. 그러나, 황토는 낮은 강도특성과 건조수축 균열 특성 때문에 현대 건설에 사용되지 않고 있는 실정이다. 최근 연구자들의 연구결과에 따르면, 황토는 플라이 애쉬나 포졸란 같은 천연 포졸란 재료로 사용될 수 있다. 본 논문에서는 황토와 슬래그, 재생 PET 섬유가 혼입된 콘크리트의 역학적 성질과 구조적인 휨 거동 실험을 수행하였다. 실험 결과 황토콘크리트의 압축강도와 탄성계수는 기준 시멘트 콘크리트 시편보다 상대적으로 낮게 평가되었으며, 철근 콘크리트 보의 휨 거동은 거의 유사하게 나타났다.