In the case of VOCs, it is known that the removal can be realized through the use of titanium dioxide (TiO2) photocatalyst. The experimental results reveal that VOCs removal efficiency for Mortar with Photocatalyst powder was effective and It was different depending on the Photocatalyst types.

This study attempts to propose the possibility of the sex reversal in Sinonovacula constricta and Gomphina veneriformis by confirming the changes in the sex ratio with the shell length in the same population level. For analysis of sex ratio, 100 individuals of S. constricta (SL 26.5-95.0 mm) and 2385 individuals of G. veneriformis (SL 15.1-60.1 mm) were used. Sex was analyzed histologically. Both species displayed the tendency of increase in the female proportion with increase in shell length. In this study, changes in the sex ratio in accordance with the growth of S. constricta and G. veneriformis are determined to be indirect evidence that signifies their sex reversal.

Concrete floating structures will experience the surface erosions by wave and floaters’ impacts. However, because there exists no standard test method in Korean Industrial standards (KS) related to this issue, proper evaluations have not been able to be performed. To resolve this problem, this study developed a testing apparatus and evaluation methods referring to ASTM C 1138, and series of marine concrete mixtures were evaluated

This research deals with the anti-washout underwater concrete applied for cast-in-place piles constructed by RCD(Reverse Circulation Drill). The anti-washout underwater concrete exhibits a compressive strength larger than 35 MPa and a slump flow of 600 mm. It is also a high fluidity anti-washout underwater concrete with an intended mass of suspended solid smaller than 150mg/ℓ. And then, we evaluated the quality performances and the fludity characteristic of the developed high fludity anti-washout underwater concrete in this study.

본 연구에서는 초고성능 시멘트 복합체(Ultra High Performance Cementitious Composites, UHPCC)의 압축강도에 미치는 강섬유 보강효과에 관한 연구를 수행하였으며, 일반 강섬유보강 콘크리트에서의 경향과 비교․검토를 실시하였다. 다양한 크기의 압축강도에 대해 UHPCC에서의 섬유보강효과에 관한 실험을 수행한 결과, 일반 섬유보강 콘크리트에서처럼 섬유보강에 따른 압축강도의 향상을 확인할 수 있었다. 실험결과는 압축강도 100MPa 이하를 대상으로 하는 일반 강섬유보강 콘크리트에 관한 기존 연구결과들과 비교분석을 실시하였다. 그 결과 모든 범위의 압축강도에 대해 압축강도에 관계없이 와 이 일정한 선형관계를 가지는 것을 규명하였으며, UHPCC를 포함하는 광범위한 압축강도의 강섬유보강 콘크리트에 대해 적용이 가능한 포괄적 섬유보강효과의 관계식을 도출하였다.