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플라이 애쉬 및 고로수쇄(高爐水碎)슬래그를 혼화(混和)한 콘크리트의 중성화(中性化)에 관한 연구(?究)
나가타키 시게요시,김은겸,오가 히로유키,Nagataki, Shigeyoshi,Kim, Eun Kyum,Ohga, Hiroyuki 대한토목학회 1987 대한토목학회논문집 Vol.7 No.3
콘크리트의 중성화(中性化)는 일종의 화학적(化學的) 반응(反應)이며, 더우기 혼화재(混和材)로서 플라이애쉬와 고로수쇄(高爐水碎)슬래그를 혼화(混和)한 경우에는 그 반응(反應)매카니즘이 매우 복잡하다. 최근에는 콘크리트의 성능(性能)을 개선(改善)시킬 목적으로 시멘트의 일부를 산업부산물(産業副産物)인 플라이애쉬 및 고로수쇄(高爐水碎)슬래그로 혼화(混和)함으로서 이들에 의한 포졸란반응(反應) 및 잠재수경성(潛在水硬性)에 의해 콘크리트의 중성화(中性化)가 촉진되어 콘크리트 속의 철근이 발창(發?)될 우려가 있다고 하는 지적이 계속되어 왔다. 본(本) 연구(硏究)에서는 이상과 같은 관점(觀點)으로부터 포졸란반응(反應) 및 잠재수경성(潛在水硬性)이 콘크리트의 중성화(中性化)에 미치는 영향을 분명히 하기 위하여 콘크리트의 배합조건(配合條件)및 수중양생기간(水中養生期間) 등을 변화시켜 자연환경조건(自然環境條件)과 다른 가혹(苛酷) 환경조건하(環境條件下)에서 촉진중성화실험(促進中性化實驗)을 실시하였다. 또한 이들의 결과를 중성화(中性化)의 조기판정(早期判定)이라는 점에 중시(重視)하여 자연환경하(自然環境下)에서 15년간(年間) 옥내(屋內)에 폭로(曝露)시킨 필자(筆者)들의 연구결과(硏究結果)와도 비교(比較) 검토(檢討)를 하여 압축강도(壓縮强度)에 바탕을 둔 새로운 중성화(中性化) 속도식(速度式)을 제안(提案)하였다. Carbonation of concrete is one type of a chemical process. The reaction mechanism is very complex for the case when low-calcium fly ash and blast furnace slag is added. When fly ash and blast furnace slag is used as an admixture in concrete, they improve compressive strength in the long term, permeability and chemical resistance of concrete by a pozzolanic reaction and latent hydraulic property. On the other hand, the pozzolanic reaction of fly ash and latent hydraulic property of the blast furance slag leads to a reduction of the alkalinity of the concrete. It has been pointed out that this will accelerate the carbonation of the concrete and the corrosion of reinforcement steel embedded in the concrete. In order to clarify the effect of fly ash and blast furance slag on the carbonation of concrete, an accelerated carbonation testing of concrete was carried out by varying the conditions of concrete and the initial curing period in water. The test results of accelerated carbonation were compared to the carbonation test results of concrete stored for 15 years in open air, but protected from rain. As a result, the equation for the rate of carbonation based on compressive strength of concrete was proposed.
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남은우,사카마키 히로유키,조은주,조혜전 고신대학교 보건과학연구소 2002 보건과학연구소보 Vol.12 No.-
This research is based on the drastically increased occurrence and death rate of diabetes recorded within the past ten years and the analysis of the Korean government's Diabetes Mellitus Management system in Korea in handling this alarming problem. The information used for this analysis is based on documents and statistics from the Ministry of Health and Welfare Statistics(2001, 2002) and also, health insurance statistics and documents from the National Health Insurance Corporation, 2001. The analysis of Health Plan 2010 will also be a key issue discussed in this paper. The Korean government's Diabetes Mellitus Management Plan's aim of increasing the life and healthy life expectancy while decreasing the medical costs at the same time is considered as a vital link in the government's Chronic Disease Management Plan. The main aim is to decrease the death rate, due to diabetes, from 22.6 people in 2000 to 19.0 by the year 2010. Health Plan 2010 plans to increase the role of public health centers. It also plans to form a system that will be used as a device in decreasing chronic diseases such as high blood pressure, diabetes and increasing general health by using the strategies of Health Plan 2010 against diabetes -to increase the government's role in public health. Korea's death rate, due to diabetes, is 2.2 times higher than that of Japan. Korea's being 22.6% compared to that of Japan which is only 10.1%. From now on our concerns should be directed in education and manpower. We need to have more specialized personnel who can be responsible for the nutrition, exercise, prevention and care of the public. Education is the fundamental basis for the control of Diabetes and is known throughout the world as the most cost-effective treatment. From this point on, the Government should concentrate on educating the people on the importance of healthy life styles. To do this it needs to provide the necessary funds needed in Health promotion and health education, and also to provide for professional personnel(eg. health educator).
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