PVA-ECC를 활용한 Half PC 복합체의 역학적 특성에 관한 실험적 연구

김재환,김영덕,김갑수,조봉석,장종호,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

ECC represents one particular class of HPFRCC, which are defined by an ultimate strength higher than their first cracking strength and the formation of multiple cracking during the inelastic deformation process. This study is to provide the fundamental data for the development of hybrid construction method such as the half PC(Precast concrete) reinforced by PVA-ECC, the mechanical properties of half PC according to the alteration of properties of PVA-ECC in terms of the type of fiber, Vr, S/M, placing height of PVA-ECC, are experimentally investigated. As the results. it is found that the half PCs of PVA-ECC have very higher mechanical performance in terms of yield load, strain capacity beyond yield point and maximum flexural load than that of mortar. Also, flexural crack in the half PCs of PVA-ECC are not localized at first crack and are growed to many micro crack, especially multiple cracking in specimen of P(12)-30-0.1ㆍ3 occurred.

콘크리트의 급속염화물침투시험에 의한 염화물이온 확산계수 평가에 관한 실험적 연구

김갑수,조봉석,장종호,김재환,김용로,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

Chloride ions are considered to be the major cause of steel corrosion in concrete structures exposed to seashore environments and also permeation of chloride is controlled by chloride diffusion. Therefore, the study on chloride diffusion of concrete have been done so far by many researchers. In this study, several factors such as capacity of voltage, time of an electric current, concentration of NaCl solution, water-cement ratio, and temperature of the solution were examined to grasp what influence they were on the chloride ion diffusion properties using the Rapid Chloride Penetration Test(RCPT) by electrophoresis. Also standing on the basis of the such result application possibility of Rapid Chloride Penetration Test(RCPT) used in this study will be evaluated and the basic data on the durability design for the chloride attack will be suggested.

Increased Urinary KIM-1 and Tubular KIM-1 Expression in IgA Nephroapathy (초)

( Mi Seon Seo ),( Soon Hyo Kwon ),( Moo Young Park ),( Soo Jung Choi ),( Jin Seok Jeon ),( Hyun Jin Noh ),( Jin Gook Kim ),( Dong Cheol Han ),( Seung Duk Hwang ) 대한내과학회 2010 대한내과학회 추계학술대회 Vol.2010 No.-

뿜칠시공에 의한 단면복구재의 시공성 및 공학적 특성에 관한 실험적 연구

조봉석,김영선,장재봉,김용로,김경덕,김무한 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1

These days, serious concerns of reinforced concrete have been raised recently over steel-bar corrosion, cracking, the deterioration of durability and structural stress resistance and so on, all due to the effects of exterior factors. Such being the case, in domestic, various repair materials and method systems to keep up with these reinforced concrete deteriorated due to salt damage, carbonation, chemical decay et. developed and applied. However, on-site quality control of various repair materials and method systems isn't achieved desirably because it is depend completely on a men of experience' opinions above all else regardless of various on - site environments. In this background, mock up test with due regard to real on-site environments was performed to secure fundamental data for establishment of desirable on-site quality control. Mock up test using repair mortar analyzed from angles of construction methods, mechanical spraying pressures, W 1M. Construction methods were designed manpower method and spraying method, spraying pressures were designed 32, 42, 52 psi, W/M were designed 14.4, 15.4, 16.4 %. And compressive strength, Chloride ion diffusion coefficient, bond strength, SEM of mock up test specimens were evaluated. In conclusion, we confirmed excellency of mechanical spraying pressures, fined extremely excellency of condition of spraying pressure 42 ps, W/M 14.4% within this study. therefore the results of this study will be useful to provide fundamental data for establishment of desirable on-site quality control.

モルタルおよびコンクリ-トの積算溫度と壓縮强度發現に關する實驗的硏究

金武漢,洪悅郞,鎌田英治 忠南大學校 産業技術硏究所 1986 산업기술연구논문집 Vol.1 No.1

An experimental study with regard to maturity and compressive strength development of concrete was carried out by using mortar and concrete specimens. Eight kinds of normal portland cement and two from Hokkaido distret were used for motar and concrete respectively. On the basis of statistical calculation of this expernmental data. the following observations and conclusions seem to be appropmate. 1) The relation between logarithmic value of maturity and compressive strength development of martar and concrete expressed in cubic regression equation shows a good correlation. 2) Since the practical curves for compressive strength development below 210D·D shown in JASS were intended to give lower limit, the obtained curves based on this test results are higher in the range below 210D·D and the curves in the range above 210D·D show lower value of concrete strength. 3) The standard additional temperature for calulation of maturity shows a little discrepancy by kinds of cement and water cement ratios, however it seems to be practically appropriate to take 10℃ hitherto as the standard additional temperature.

三天池의 環境과 微生物의 多樣性

한상국,이종운,배소현,장무웅,김시균 嶺南大學校 環境問題硏究所 1993 環境硏究 Vol.13 No.1

경상북도 경산시에 위치하고 있는 삼천지에 대한 환경요인 및 미생물상에 관하여 조사하였다. 삼천지 수계의 환경요인 분석결과, 그 평균값은 기온이 25.8℃, pH6.77, 경도 117.94mg/ℓ, 부유물질 4.5mg/ℓ, 용존산소량 3.3mg/ℓ, 생물학적 산소요구량 6.6mg/ℓ, 화학적 산쇼요구량 7.2㎎/ℓ, 염소이온 17.56㎎/ℓ, 황산이온 7.14㎎/ℓ로 나타났고, 중금속류는 Mn과 Zn만이 소량 검출되었으나 전반적인 오염도가 높아 수질환경 기준 IV급수에 해당하였다. 총 세균수는 3.32-8.85×?? No. inds/㎖의 분포를 나타냈고, 식물플랑크톤의 종구성은 규조류 33종, 녹조류 26종, 남조류 8종, 유글레나 13종, 와편모조류 6종 등 86종이 확인되었다. 규조류중 띠돌말과에 속하는 Fragilaria capucina, Synedra acus, S. familiaris 가 우점종이였다. Environmental factors and microflora of Samchun-impoundment in Kyongsan, Kyongpook were studied. Average data of environmental factors analysis are as followings : air temperature 25.8℃, pH 6.77, total hardness 117.94mg/ℓ, SS 4.5mg/ℓ, DO 3.3mg/ℓ, BOD 6.6mg/ℓ, COD 7.2mg/ℓ, ?? 17.56mg/ℓ, ?? 7.14mg/ℓ, Mn 0.05mg/ℓ, Zn 0.04mg/ℓ. Total bacteria in 4 site were 3.32×?? No. inds/㎖. Distribution and species of phytoplankton and zooplankton were 86 species including 33 species of bacillariophyceae, 26 of chlorophyta, 8 of cyanophyceae, 13 of euglenaceae, 6 of dinophyceae. Fragilaria capucina, Synedra acus, S. familiaris were dominant species.

낙동강 하류의 수질 예측 모델 개발

김무홍,김영한 동아대학교 환경문제연구소 1992 硏究報告 Vol.15 No.1

There have been many studies to control the water quality of Nak Dong River, but model development for the prediction of the quality was not attempted and the effective proposal to manage the quality was not made yet. To solve the problem, the cumulative flow model has been applied to predict the water quality in Nak Dong River and solved numerically. Though a few difficulties were found in the process of computation, the possibility of quality prediction and selection of the optimum location of quality control was observed.

地域環境騷音의 測定과 評價

金茂一,崔正翰,金甲洙 嶺南大學校 環境問題硏究所 1991 環境硏究 Vol.10 No.2

This study was carried out to evaluate a methodological aspect for determining the representative values of environmental noise in an area. The results are summarized as follows : (1) There was no significant difference in the average values of noise levels for the samples with 1 second sampling frequency and with 5 second frequency Hence, when noise monitoring is performed in the field, the sampling frequency of 5 second appeared to be reasonable for the determination of representative environmental noise levels. (2) Evaluation of Leq, ?? as an environmental noise indicator revealed environmental noise levels. (3) For obtaining the representative values in an area (ie 300m × 300m) within a standard deviation of 2 dB, at least 10 site seemed to be necessary for the determination of representative values. (4) For a particular area, at least 5 sites were necessary for the determination of the representative values with a standard deviation of 1.5dB or less. There results suggest that more detailed sampling procedures or methodological protocols are required for improving the currently applied environmental testing method in this country.

초등교사의 스포츠 활동참여와 건강관리 실태에 관한 조사 연구

김무영,정한국 全北大學校 敎育大學院 2002 敎育論叢 Vol.22 No.-

The main purpose of this study is to survey on the status of elementary school teacher's participation in sport activities and health administration. The following conclusions were drawn from research procedures and data analysis: 1. More than half of the teachers are proved to be very interested in their health care. Men teachers are very interested in their health care than women teachers. 2. General method to maintain a healthy life are as follows: rest, good nutrition, and appropriate exercise. They have plan to change the method from the static method to dynamic method. They believe exercise is good for health. 3. Most teachers think highly of the importance of a sport activity, expecting release from pressure to get revitalized, and for the development and maintenance of a healthy body. 4. Teachers usually exercise during half an hour to one hour in a day, For those teachers who do not exercise, the reasons given most frequently is unable to spare the time. 5. Teachers belive that their participation in sports produce a positive effect on the job to their health and to reduce stress. 6. The ranks of sports that men teachers could be accessible are climbing, jogging and volleyball, but wemen teachers prefer to participate in bowling, climbing, jogging. But the ranks of sports that they'd like to participate in are bowling, fencing, swimming.

증점제를 사용한 고유동콘크리트의 기포조직과 내동해성에 관한 실험적 연구

김무한,권영진,강석표,여동구,김용로,장종호 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.1

Recently, lots of studies for high flowing concrete have been suggested under practical use that it is only a way to solve the confronted problem. However, most studies have been concentrated on the manufacture method and properties of fresh concrete, but there is few studies for the durability of hardened concrete, specially for the freezing and thawing. It is generally known that the frost resistance of concrete is much affected by the air content in concrete and by the air void system. The frost resistance is also believed to vary with the strength of concrete. The purpose of this experimental study is to make a comparison between high flowing concrete using viscosity agent and ordinary concrete about the effect of the viscosity agent, air content and curing method on the frost resistance. As the result of tutus study, the frost resistance have not effect the viscosity agent but effect the different of curing methods.