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.

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.

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.

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.

대한상하수도학회·한국수자원공사 공동주최 2003년도 제2회 부상분리 국제워크샵 보고문

한무영,김진호,독고석,곽동희,류석위 대한상하수도학회 2003 상하수도학회지 Vol.17 No.6

부상공정에서 금속이온의 기포 표면 전위 특성 및 반응효율

한무영,독고석,김영환 대한상하수도학회 2004 상하수도학회지 Vol.18 No.2

Flotation processes involve the use of very small bubbles(micro-bubbles) to separate particles from water. The process has become a good alternative to sedimentation, especially where the particles are small or of low density. Although the flotation process commences with a collision between particles and bubbles, most research has been focused only on the characteristics of the particles. In this paper, recent theoretical and experimental research on the characteristics of bubbles is summarized. The effect on the collision efficiency of the size and charge of bubbles is calculated through trajectory analysis. The size and charge of bubbles are measured under different conditions and the ramifications of the results are discussed. The results may lead to a better understanding and optimization of the existing process. In particular, we discuss an idea that a new advanced flotation process might be possible by the modification of the characteristics of the bubble alone or of both bubble and particle.

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.

내구성을 고려한 표면피복재의 성능평가에 관한 실험적 연구

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

It is recognized that reinforcement corrosion is the main distress behind the present concern regarding concrete durability. The basic method to prevent reinforcement corrosion is coating the reinforcement concrete with surface coating materials but evaluating their performance is necessary to the work satisfactory because they have different performance for each other. In this study. to evaluate performance of surface coating materials, we compare their properties in terms of sticking strength and permeability of carbonation, chloride ion and water with actual reinforcement corrosion under environment of complex deterioration. The results showed that an increase in age also decreases Carbonation velocity coefficients, increases Chloride ion diffusion coefficients and increases water absorption coefficients. As well, an increase in age also increases corrosion of reinforcement due to permeability of carbonation and chloride ion. And sticking strength of inorganic coating material is higher than organic coating material.