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有孔거푸집을 이용한 콘크리트 표층부의 緻密化에 關한 實驗的硏究 (2)
정재동(Jaung Jae-Dong) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.7
Although higher water cement ratio makes concrete workable, the durability is strongly reduced. Recently there are some ideas to use holed molds in order to take off the surplus water form the surface after casting the concrete. In this paper, with measuring the amount of water form concrete surface, water cement ratio, compressive strength, unit weight, ultra sonic velocity and a speed of carbonation, and these measured date is expected to helping for practical use of The holed molds.
황토를 첨가한 시멘트 모르타르의 압축강도 및 해교성에 관한 실험적 연구
정재동(Jaung Jae-dong),조현대(Cho Hyun-Dae),유병문(Ryu Byeong-mun),배승환(Bae Seung-Hwan) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
In this research, we tested non-sintering and sintering red clay mixtured meterial’s with compressive strength and peptization for possibility of replacing cement. In comparison of strength test in OPC and 10 percent of red clay mixtured materials, 20 precent of red clay mixtured materials and 30 percent, 10 percent of non-sintering red clay mixtured material"s strength is same as OPC and 10 percent of sitering red clay mixtured one is stronger. All other cases show low strength. There"s no visible peptization in all cases.
석재 가공 시 발생하는 석분슬러지의 시멘트 혼화재료로서의 활용방안에 관한 연구
정재동(Jaung Jae-Dong),조현대(Cho Hyun-Dae),황철현(Hwang Cheol-Hyeon) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
The stone sludge made from the particulates, which are generated during the stone processing, is classified as industrial waste. Although some of them are used as fill material or bricks, the majority of the industrial waste is mostly sent to the landfills. For such a reason, this research is focused on studying the utilization of high-value added measures in a environmental friendly way for the stone sludge. The stone was processed with Non-sintered and sintered then added to the cement mixture. However based on the experiment results, the mixing ratio increased as the strength of the pressure decreased and the sintered temperature increased along with the incidence of strength.
再生骨材를 使用한 콘크리트의 强度發現特性 및 耐久性에 관한 硏究
정재동(Jaung Jae-Dong) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.9
This study discusses on the properties of strength development and durability of recycled aggregate concrete which was classified low quality recycled aggregate with the type 2 and type 3 of KS F 2573 In the experiment, recycled coarse aggregate was substituted for the crushed coarse aggregate at the rate of 0, 50, 100% And, each concrete specimen was made for 40, 50, 60% of w/c ratio As the result, the concrete strength development which was made of recycled aggregate is suitable for KS F 2573, but its durability is lower than that of crushed aggregate concrete On the ground of the experiments in durability of dry weight reduction contents, acid resistance, neutralization, there is remarkable difference by substitution ratio and type of recycled aggregate Therefore, it needs proper verification and consideration to use the recycled aggregate for concrete.<br/> <br/>
윤재환,정재동,Yoon, Jai-Hwan,Jaung, Jae-Dong 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.3
In this paper, salt damage resistance of high durable concrete was tested. High durable concrete was made by using low water cement ratio, chemical admixture called super-durable admixture and mineral admixtures such as fly-ash, ground granulated blast-furnace slag, silica fume. Two kinds of salt damage resistance test were carried out. One method is chloride ion penetration test(ASTM C1202), and the other one is depth of chloride penetration test in saline solution. Test results were as followers: 1) The depth of chloride ion penetration increased exponentially as water cement ratio was increased and time passed. 2) Super-durable admixture had little effect on the improvement of salt damage resistance of concrete. 3) Silica fume and ground granulated blast-furnace slag were effective on salt damage resistance because of pozzolanic reaction, but fly-ash had a little effect.