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광합성균을 혼입한 시멘트 모르타르의 CO<sub>2</sub> 흡수성능에 관한 기초적 연구
정재호,이건철,윤승조,조재홍,최중구,Joung, Jae-Ho,Lee, Gun-Cheol,Yoon, Seung-Joe,Joe, Jae-Heung,Choi, Jung-Gu 한국건축시공학회 2015 한국건축시공학회지 Vol.15 No.1
In this research, the $CO_2$ absorption performance of mortar was investigated. The level of $CO_2$ absorption in mortar with various binders including cement and nonsintered cement was examined. As a result for the mortar with photosynthetic bacteria, the compressive strength was similar to the one without the bacteria at early age but decreased at the age of 28 days. However, for the $CO_2$ absorption, with photosynthetic, the performance of the mortar with OPC, and nonsintered cement deceased to 21%(234 ppm) and 19.7%(243 ppm) respectively after 12 hours age. 본 연구에서는 $CO_2$ 흡수형 콘크리트의 개발을 목적으로 광합성균을 혼입한 모르타르의 기초적 특성 및 $CO_2$ 흡수 성능에 대하여 검토하였다. 아울러, 결합재 종류별 $CO_2$ 흡수 가능성을 판단하기 위하여 결합재로서 시멘트 및 비소성 시멘트를 사용하여 그 특성에 대하여 검토하였다. 실험결과, 강도특성은 광합성균의 혼입한 경우 혼입 모르타르에 비해 초기강도는 유사하나 장기강도발현이 저하하는 것으로 나타났다. 그러나, $CO_2$ 농도측정 결과는 광합성균을 혼입한 경우 무혼입에 비해 12시간 후 측정치가 OPC의 경우 약 21%(234 ppm), 비소성시멘트의 경우 약 19.7%(243 ppm) 감소하는 것으로 나타났다.
폐도자기 분말도 변화에 따른 순환골재 사용 콘크리트의 물리적 특성에 관한 연구
류현기,박정민,정재호,김의창,윤승조,Ryu, Hyun-Gi,Park, Jeong-Min,Joung, Jae-Ho,Kim, Eui-Chang,Yoon, Seung-Joe 한국건설순환자원학회 2011 한국건설순환자원학회지 Vol.6 No.2
본 연구의 목적은 폐도자기 분말도 변화에 따른 순환골재 강도 증진에 관한 연구로 유동성은 폐도자기 분말 치환율이 증가할수록 유동성이 감소하는 경향으로 나타났으며, 공기량은 KS 한도범위를 만족하는 것으로 나타났다. 압축강도는 순환골재 및 폐도자기 분말 치환율이 증가할수록 증가경향이고, 내구성으로 건조수축에 의한 길이변화는 폐도자기 미분말이 커질수록 다소 완만한 건조수축율을 나타내었고, 또한 단열온도상승은 순환골재 대체율 및 폐도자기 미분말이 증가할수록 최고온도에서 약 $6{\sim}10^{\circ}C$정도 낮게 나타내어 수화열에 의한 균열저감 효과를 발휘하였다. 순환골재 사용량을 30%정도 권장 하고 있지만 점토인 폐도자기의 분말도를 조절하여 사용할 경우 순환골재의 다량 사용시에는 콘크리트의 제반성상에 문제가 없을 것으로 판단되었다. Objective of this study is to identify properties on strength increase of hardened concrete and fluidization of non-hardened concrete using waste ceramics generated by construction waste, which is a type of industrial waste, and by ceramics, which is a clay plastic, during its production process, and determine length change ratio caused by drying shrinkage during substitution of recycle aggregate and waste ceramics, and whether they can be used as concrete compounds. Slump of non-hardened concrete exhibited the best fluidization and formability at recycled aggregate's replacement ratio of 60% driven by higher substitution ratio of recycled aggregate and waste ceramics while air content met the KS requirement when substitution ratio of waste ceramics was $4,000cm^2/g$. Compressive strength of hardened concrete exceeded the requirements at early age and standard age and temperature dropped by roughly $6{\sim}10^{\circ}C$ less than the standard at maximum temperature in adiabatic temperature increase, which will hopefully result in stronger durability.
폐타이어와 카본블랙을 혼입한 콘크리트의 수밀성과 역학적 특성에 관한 연구
박정민(Park Jeong-Min),정재호(Joung Jae-Ho),류현기(Ryu Hyun-G) 한국정보기술학회 2011 Proceedings of KIIT Conference Vol.2011 No.5
Objective of this study is to identify water tightness of concrete mixed with waste tires and carbon black, which are used as rubber reinforcement to recycle waste tires that is a type of industrial by-product, and its impact to dynamic properties of concrete. Slump of non-hardened concrete was smaller at each substitution ratio compared to plain concrete and segregation occurred when particles 1∼2㎜ and 5∼7㎜ in size displayed substitution ratio exceeding 15%, respectively. Air content tended to increase in proportion with substitution ratio of waste tire while bulk intensity was inversely proportional to air content. Both compressive strength and tensile strength declined in hardened concrete relative to plain concrete but strength development remained nearly unchanged between hardened and plain concretes when mixing 5% in substitution ratio of waste tire 1∼2㎜ in particle size and the same for waste tire 5∼7㎜ in particle size. Absorption ratio was 3.2∼57% higher in hardened concrete than in plain concrete and permeability also was higher in hardened concrete by 0.4∼44%.