高速道路 路線의 透水性地盤 處理工法에 關한 硏究(第1報)

郭鍾現,朴春洙 大田工業高等專門學校 1968 論文集 Vol.3 No.-

Very often, the water permeation of the soil is a trouble to dealing with the problems of soil engineering or foundation engineering. In case the geology of the operation, in the super high way and the other civil engineering projects, is nst good;the site of the operation needs to be moved to different place. However, when there are existing facilities or when there are no proper foundations, the site of the operation can not be changed. Therefore, the special way of engineering operation is mentioned here which has to be applied in that case. And a laboratory experiment is made, for the purpose of stopping water from permeating the foundation, by chemical reagents in the materials, which water permeating foundation contains, such as fine sand, coarse sand, and coarse-sand and gravel. According to the result of the experiment, some conclusions are presentented and arranged here as follows : 1. In permeability test of constant water level with dry sand, the amount of water permeation decreases as the time goes; and nearly the same amount of permeation is maintained after twenty four hours or so. 2. It is considered that the same amount of permeation is not maintained by the function of the air in the soil and the air in the permeating. water. 3. Soon after chemical agent is poured, the amount of permeation decreases suddenly, but as the time goes, it maintains mormal condition. 4. It is considered that the effect of chemical agent pourring happens immediately, for the results of permeating soon after and twenty hours after chemical agent pouring are the same. 5. The change of the permeation coefficients is chiefly influenced by the thickness of the first chemical agent (Na_2Sio_3). The best thickness is 10~15%. The second agent is Cacl_2. 6. The best influences of the chemical agents are as lollows: It is treat. 1-15-5(15% Nea_2Sio_3, 5% Cacl_2)in fine sand. treat. 2-10-3(10% Na_2 Sio_3, 3% Cacl_2)in coarse cand, and treat. 3-15-15 (15% Na_2Sio_3, 15% Cacl_2) in coarse-sand and gravel.

人工輕量骨材 콘크리트의 特性에 關한 硏究

郭鐘現 大田工業專門大學 1979 論文集 Vol.25 No.-

Cement concrete is widely used as typical construction material through its high compressive streugth and durability, but the high weight of it has teen pointed out as one of great defects. Therefore, many ways have been tried in order to make the light-weight concrete. Recently many different kinds of structures have become large size and have taken varied forms in accordance with the improvement of industrial economy and the development of science. Moreover, the exploitations of prefabricated matters and their extensive utilizations have made the lightening of concrete an urgent subject. And the shortage of aggregates in the rivers and the social needs on nature protection hate made the artificial light weight aggregates problems an urgently confronted subject In this thesis the problems in executing techniques and how to make the light-weight concrete which can be used for all kinds of structures are studied by examining the properties of native artificial light-weight aggregate concrete. Each amount of cement per oubio meter is 340kg/㎥, 370kg/㎥, 400kg/㎥ and the water-cement ratios are changed into 40%, 45%, 50%, 55% and the mix proportions are decided. After a specimen of 10×20cm is made, the compressive strength and the slump are tested out of it. And also the bending strenght is tested by the beam specimen of 15×15×45㎠ size, and all physical experiments are performed on all the materials used in this concrete. The results show 35 follows : 1) When the mixer is used in mixing concrete, it is impossible to have them completely mixed, because the big aggregates are so light that there occurs separating among each matter. This is a problem to improved here-after. 2) The specific gravity of the artificial light-weight aggregate is 1.16, so the unit weight of concrete per cubic meter is about 1310kg/㎥. This reaches to about 57% of the weights of common concretes, and this is so light that it can be contributed to the lightening of structures and to the reductions of construction expenses. 3) As the compressive strength is about 72% of that or common concrete, it seems to be low, and the tensile strength is about 1/6 of the compressive atrength, they seem to be very high. 4) When the water-cement ratios are 40%, 45%, there is no slump, and when the water-cement ratio is 50%, the strength is the most prominent in every strength. 5) This concrete can certainly be used in non-persistent parts of buildings, and I think that it oan be used extensivenly in every kind of structure, if only some defects are improved-i.e., if the compressive strength is promoted.

骨材의 粒度가 MORTAR 및 CONCRETE의 强度에 미치는 影響

郭鍾現 大田工業高等專門學校 1970 論文集 Vol.6 No.-

It is widely known that the grading of aggregate has a great influence on the strength of mortar and concrete. At present the various works of mortar and concrete, however, are being executed with emphasis chiefly on the proportion but slightly on the grading, of aggregate. This not only makes the construction flimsy dut brings forth a great loss of property and lives. In order to try and solve this problem an experiment has been made of the influence of the grading on the compression stress of mortar and concrete, whose results are summerized as follows: a) In the proportion of the same grading, both mortar and concrete have their strength dominated by the amount of the cememt used. b) In any proportion mortar and concrete have their strength lowered positively, if the water-cement ratio is not proper. c) Mortar has greater strength when the mixed ratio of the aggregate of higher grading is bigger than that of lower grading. d) In concrete, its strength is strong and commonly fit when one or two grading of sort is used intensively, but when the grading is mixed in permutaion it is reversed.

다중회귀분석에 의한 평균유사농도의 산정

곽종현,이종각,이종석,김종배 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.0201

본 연구는 총유사량의 산정에 기초가 되는 평균 유사 농도식 (1)또는 (2)를 유사이송개념에 의한 방법중 다중회귀분석에 의해 유도하고 그 결과를 실측치와 비교하였다. 평균유사농도식의 유도에는 175개의 현장자료와 305개의 실험자료가 포함된 480개의 실측자료가 이용되었으며, 다중회귀분석에 의한 관계식은 수심과 평균유속, 수로경사, Froude 수 및 하상재료의 중앙입경을 변수로 하는 5개의 독립변수로 하여 유도하였다. 유도된 관계식은 수심이 0.030~5.288m이고, 평균유속은 0.021~2.880m/sec이며, 수로경사는 0.000081~0.024348, 하상재료의 중앙입경은 0.084~28.650 mm, Froude수는 0.061~2.060 및 평균유사농도는 9.1~49,300 ppm의 범위 내에서 총유사량의 산정에는 물론 미계측 하천에서 총유사량의 개략치를 산정하여 유사이송의 문제를 해석하는 데에도 적용이 가능할 것으로 사료된다. The derived formulation (1) or (2) in this study was developed in order to compute the total sediment discharge from the one by the multiple regression analysis one of the determined method for averaged sediment concentration in the sediment transport concept, and the result compared with measured data. The used data set in derived formulation consist of the total 480 data including 175 and 305 measured data in natural channels and experimental channels, respectively. Also, the formulation was derived by the multiple regression analysis, and were composed of 5 independent variables of flow depth, mean velocity, channel slope, Froude number, averaged sediment concentration and median diameter in bed materials. Those variable values were ranged 0.030~5.288m in flow depth, 0.021~2.880m/sec in averaged velocity, 0.000081~0.024348 in channel slope, 0.084~28.650mm in particle median diameter, 0.061~2.060 in Froude number and 9.1~49,300ppm in averaged sediment concentration, respectively. And the derived formulation for the averaged sedliment concentration can be used analysis of sediment transport problems as well as approximation of total sediment discharge in natural alluvial rivers.

人工輕量骨材 콘크리트의 機械的 性質에 關한 實驗的 硏究

곽종현,조성배 한밭대학교 산업과학기술연구소 1995 논문집 Vol.3 No.-

recently, it is presented that a problem solution of the quality, quantity of the aggregate is faced as a impending problem with the structures become more larger, higher owing to the development of constructional technology for unexpected excessive demand of concrete brought about aggregate shortage problem. Therefore, to contribute the utilization of the structural light concrete by reduce dead light, one of the deficiency of concrete, this study was practiced. With the artificial light weight aggregate used a expanded clay made a artificial light weight aggregate concrete tested the compressive strength, the tensile strength, the bending strength, and practiced the following various analysis. Finally the method of application as a various structural materials was studied.

人工輕量骨材콘크리트의 特性에 關한 硏究

郭鍾現 충남대학교 농업과학연구소 1982 農業技術硏究報告 Vol.9 No.-

Cement concrete is widely used as a typical construction material through its high compressive strength and durability, but heavy weight of it has been pointed out as a great defect. Therefore, many trials have been made in order to make light-weight concrete. Recently many kinds of structures have become larger-sized and have taken varied-forms in accordance with the improvement of industry and the development of science. Moreover, the exploitation of prefabricated matters and their extensive utilizations have made the lightening of concrete for an urgent subject. And the shortage of aggregates in the rivers and the social needs on nature protection have made the artificial light-weight aggregates problems as an urgently confronted subject. In this thesis the problems to make the light-weight concrete which can be used for all kinds of structures are studied by examining the properties of native artificial light-weight aggregate concrete. Amount of cement are 340 kg/㎥, 370kg/㎥ and 400kg/㎥ respectively and water-cement ratio are 40%, 45%, 50% and 55% respectively. After a specimen of 10×20cm is made, the compressive strength and the slump are tested. And also the bending strength is tested by the beam specimen of 15×15×45 cm and all the physical properties are performed on the materials used in this concrete. The results are as follows: 1. It is nearly impossible to mix aggregates completely with mixer, because the coarse aggregates are so light that there occurs seperating among each matter. This problem should be improved hereafter. 2. The specific gravity of the artificial light-weight aggregate is 1.16, so unit weight of concrete is about 1310kg/㎥. This weight is equivalent to 57% of the weight of common concrete, and so it could be contributed to the lightening of structures and to the reduction of construction cost. 3. As the compressive strength is about 72% of that of common concrete, it seems to be too low, and the tensile strength is about 1/6 of the compressive strength, it seems to be very high. 4. When water-cement ratio are 40% and 45%, there are no slump, and when the water-cement ratio is 50%, the strengh is most prominent. 5. This concrete could be certainly used in non-persistent parts of buildings, and could be extensively used in every kind of structure, if the compressive strength is promoted.

콘크리트의 高强度化에 關한 硏究 : Auto-clave 養生에 依한

郭鍾現 大田工業專門學校 1977 論文集 Vol.21 No.-

HEC-1 모형에 의한 산간지 하천유역에서의 유출해석

곽종현,이대철,이종석,홍진표 大田産業大學校 1998 한밭대학교 논문집 Vol.15 No.1

The Hydrologic runoff process is a complicated system which consists of hydrologic and hydraulic factors, watershed characteristics and runoff properties. In this study the design flood discharge of the upper basin of the Guem river watershed has been determined based on HEC-1 model. For this purpose, the studied area was divided into 9 sub0basin and 7 channel reaches, and then watershed and river routing have been applied to such sub-basin and channel reaches. As the results, the estimated flood discharge was quite well agreed with the observed one. The parameters such as the lag time, peak time and runoff curve number appeared as the most important factors in runoff analysis. As the considered sub-basin is getting closer to main gage station, the lag time and peak time values decrease while the runoff curve number increases. Overall, this study may provide the useful information of estimation the design flood in smalll watershed of upper catchments.

高速道路 路盤의 軟弱地盤 改善工法에 關한 硏究 : Sand Drain 工法에 依한

郭鍾現,朴春洙,李會晩 大田工業高等專門學校 1969 論文集 Vol.5 No.-

If were construct structures or bank on the soft-clay stratum. the settlement would keep on over a long time in future. Therefore, there would happer meor venience in constructing structures, and the failures of them result from the differential. When we are to make use to the sand drain in order to improve such a soft-clay stratum. the first object consists in decreasing the subsequent differential to the minimum by bringing about the differential rapidly, which should take place in future, within the shortest time. The second object is to get the strength of the stratum in a hurry, which is necessary to the safety of the structures. But it is common to try to get the effects of both of these at the same time. This research is about the effects of sand drain which depends upon the boundary condition of the soft-clay stratum. And as the result of the indoor experiments, in case of setting up the sand pile, changing the diameter of the settlement, comparing and examming the practical measures and theoretical ones. The results of them are as follows: a. The consolidation settlement is more promoted in a double drainage than in a single one. b. The proportion of the diameter of the sand pile against the effective diameter of soil cylinder, that is, "n_" is large in the amount of the consolidation settlement of a small test ward. c. Compared with the occasion when we did not set up the sand pile, there arose 1.83 times consolidation settlement in the single drainage, 1.38 times in a double one, and 1.65 times at the average. d. In the same value of "n_", the amount of the consolidation settlement appeared larger when we make the effective diameter of soil cylinder small. e. The amount of the consolidation settlement of the actual survey appeared as 70% of the theoretical one. f. The treatment in which the effects of consolidation settlement of the sand drain appeared the most ideal, is B_1-9-3 in a single drainage and B_2-9-3 in a double one. g. After the conclusion of the settlement, the horizontal distribution of moisture content increased in proportion to the effective radius of soil cylinder from the sand pile.

大田地方 河川 모래에 對한 有機不純物 含有量 調査에 關한 硏究

郭鍾現 大田工業專門學校 1976 論文集 Vol.19 No.-

本 試驗은 시멘트 모르터 또는 콘크리트에 使用되는 天然砂中에 含有되어 있는 有機化合物의 有害量을 大略 決定하며 모래의 使用與否를 判斷하며 더 精密한 모래에 對한 試驗의 必要性의 有無를 알리는데 目的이 있다. 産業의 發達과 더불어 늘어나는 콘크리트의 量도 큰 것이지만 좀 더 改善된 좋은 콘크리트를 만들어 構造物의 耐久性을 增加시키는 것은 우리 技術人들의 課題라 하겠다. 이에는 많은 要因들을 改善 또는 精選이 있어야 하지만 이 試驗은 그 中 一部인 것이다. 本 試驗에서 얻은 結果를 要約하면 다음과 같다. (1) 都市近方의 河川은 모두 汚染되어 있어 이 地域의 모래는 거의 使用할 수 없게 나타났다. (2) 都市順邊의 河川모래는 아직은 使用할 수 있을 程度이나 相當히 汚染되어 있으며 그 程度는 점정 甚해질 것으로 보인다. (3) 都市에서 相當히 떨어진곳 은 아직 염려할 것이 못되는 것으로 나타났다.