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재생굵은골재를 이용한 라텍스 개질 콘크리트의 특성에 관한 연구
유덕룡,고성석 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 논문집 Vol.10 No.5
본 연구는 재생굵은골재를 이용한 콘크리트의 성능을 개선하기 위하여 SBR 라텍스를 활용하여 재생골재 콘크리트를 제조하고, 유동성과 역학적 성능 및 건조수축에 대하여 검토하였다. 실험결과 SBR 라텍스를 6%정도 혼입하면 재료분리에 저항하는 유동성을 확보할 수 있고, 압축강도 증진 및 휨강도 개선에 큰 효과가 있는 것을 알 수 있었다. 또한 건조수축의 감소에 우수한 재생골재 콘크리트를 제조할 수 있을 것으로 판단된다. This study is purposed to improve the performance of concrete made of recycled coarse aggregate. For this, recycled aggregate concrete was produced with SBR latex, and fluidity, dynamic performance and drying shrinkage were examined. According to the result, with mixing 6% of SBR latex, fluidity having resistance against segregation can be insured and compressive and flexural strength was increased. Especially the increment in terms of flexures was remarkable. In addition to, with above mixing ratio, drying shrinkage was reduced. Therefore there is a strong inference that superior recycled aggregate concrete can be produced with using 6% of SBR latex.
건설산업 ISO 9000 품질시스템의 합리적 정착을 위한 개선 방안에 관한 연구
김정섭,유덕룡,강연구,박광수 朝鮮大學校 建設技術硏究所 1999 建設技術硏究 Vol.19 No.3
ISO 9000 Quality System has been proved it's effectiveness in the advanced countries for years. And many companies in the world has been accepting the Quality System resulting in increasing of sales, decreasing of poor quality goods or complaints and elevating sense of quality, etc. Still, however, in the construction industrial fields, there are several problems to solve in the process of accepting the Quality System such as surveys for speciality of constructing site. If government organization in charge of operating the System, Accreditation Body, Certification Body, research institute and certificated construction companies are searching for the improving devices organically, ISO 9000 Quality System will be settled reasonably in the construction industry and become a good system to guarantee the construction quality and working system.
鹽化物 含有量에 따른 鐵筋腐食 및 콘크리트 强度特性에 관한 實驗的 硏究
김정섭,강연구,유덕룡,박광수 朝鮮大學校 建設技術硏究所 1999 建設技術硏究 Vol.19 No.2
As reinforced concrete buildings have been large, high-storied and high perfomance supply of river sand and gravel is insufficient and sex sand and crushed gravels which have the problem in internal force and durability are used as substitute aggregates. The problems caused by the use of sea sand lower the durability of reinforced concrete building according t o the content of chloride and shellfishes and cause the problem of corrosion and neutralization of reinforcing rod. Therefore, this study analyzes the degree of corrosion and neutralization of reinforcing rod which are the causes of lowering durability of reinforced concrete buildings with the variable of chloride content through the experiment and obtains the following results. 1. As a result of experimenting river sand and sea sand by comparison, the corrosion can be found at reinforcing rod without using rust proof paint regardless of the covering depth from 60 days of age and especially, the extensive corrosion is occurred at the damaged reinforcing rod among the same rods. 2. As a result of neutralization experiment with river sand and sea sand, there is no response in neturalization till 60 days of age. 3. As a result of strength and non-destructive strength test with river sand and sea sand, it is found that the value of strength is increased more at the test specimen using sea sand than river sand and while the specimen using river sand shows increasing value of strength continuously based on 28 days of age, the specimen using sea sand shows the decrease in strengh as it has more chloride contents. It is thought that evaluation experiment and method of durability and security and countermeasure of durability according to age on the basis of the basic materials of this study should be conducted as future research task.