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Asphalt로 피복된 Portland Cement를 使用한 Concrete의 諸性質
尹錫天,李昌甲,洪元杓,鄭秀永,南宰鉉 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.1
The construction works with concrete has the potential problems of water tightness. The conventional treatments for water-tight concrete are not satisfactory in terms of strength and water tightness. This study was to investigate the effects and application of the asphalt-coated portland cement on water-proof of the concrete and its influences on the physical properties of the concrete. The asphalt-coated portland cement, which is hereafter referred to as ACPC, was made by coating ordinary portland cement with asphalt in the rate of weight ranging from 0.5 to 1.0 percent. In this process, Calcium Chloride and Sodium Silicate were tried as the hardening time accelerator for producing ACPC, and carbon black, talc and other materials were tested for their effectiveness as pore filler. The specimens were prepared and tested with the various amounts of additives as a variable factor to find the optimum material. The analysis was mainly focused at water tightness, physical properties of the concrete and working conditions. The major findings of this experiment are as follows ; 1) Water-proof Test ① The specimens of ACPC and ordinary portland cement(OPC) were tested under the pressures of 3 and 9 kilograms per square centimeter per 24hours respectively and compared. The OPC specimens showed considerable amount of leakaged water while the ACPC specimens were rated lower permeabilities of 89%/28days, 40%/56days and21%/84days under the abovementioned pressure conditions. The most successful composition for water-proof was identified as ACPC added with Calcium Chloride and carbon black. ② The ACPC demonstrated its superiority in absorption test. The absorption amount of OPC for l hour was greater than that of ACPC for 24hours. 2) Compressive Strength Test Four kinds of specimens of ACPC aging 7, 28, 56 and 84days were tested and compared for their respective results of OPC. The ACPC added with carbon black was lower than OPC in compressive strength in the case of curing ages of 7 and 28days but ACPC was superior to the OPC in the specimens aging 56 and 84days. The ACPC added with others except carbon black exposed their lower compressive strength in all circumstances compared with the OPC specimens. 3) Slump Test The slump of ACPC with various additives such as carbon black, talc or clay was 21.6 centimeter which was higher than the OPC of 18.4centimeter slump. This result concluded that ACPC was much favorable in workability in comparison with that of the OPC. The conclusions are summarized as follows; 1) The optimum mixture for water tightness and compressive strength of concrete was found at 0.5% of SACPC, Calcium Chloride and carbon black respectively at the rate of the weight of cement.
하한기,연길환,윤석천 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.1
This study aims to review the problems and status of prefabricated housing system joint domestically also to find out the ways of improvement methods from construction. For the study the literature and previous studies are reviewed and then, architectural defects by APT residents and supervisors were examined. The results of this paper are as follows, Exterior wall and interior floor panel joint, we must laying waterproofing sheet and plastering adiabatic mortar. In vertical panel, joint should lay waterproofing sheet and fill with non-shrinking mortar. The success or fail in prefabricated housing system, it depends entirely on improvement defects as water leakage, moisture, soundproofing, so that field quality control must be emphasized. For the sake of it, the standardization and normalizing of materials, filling concrete, hardware, glasswool, and sealings must be preceded.
황선경,임경택,윤석천 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2
Seismic design of reinforced concrete structures if based on the ductility approach that study to improve of strength and ductility in concrete members to require. This paper is, therefore, to study on the strength and the ductility of reinforced concrete columns subjected to high axial compression loads(0.35fc' .Ag). The test results from 1/3 scale models using high-strength reinforced concrete (fc'=560/㎠) is presented. For the research the experimental variables used the shape of shear reinforcing bar, the space of shear reinforced bar and axial force ratio. As a result, deformation capacity of reinforced concrete columns subjected to high axial compression loads affected in the influences of axial force ratio and the space of shear reinforced bar, the shape of shear reinforcing bar.
최병철,임경택,정수영,윤석천 忠南大學校 産業技術硏究所 1993 산업기술연구논문집 Vol.8 No.2
This paper is to study strength and ductility under uniaxial compression. The main objects of this study are to determine the strength gain factor and ductility considering the effect of the spacing, volumetric ratio of lateral steel to concrete core, tie configuration. To achieve the above objects, twelve reinforced concrete columns which are confined rectangular( □), cross( + ), diagonal(◇) tie steel, are used. In the theoretical analysis, the effect of the double confined in concrete due to lateral reinforcement was proposed. And these assumptional results were compared with experimental results.
콘크리트의 壓縮强度에 미치는 굵은 골재 크기의 영향에 관한 基礎的 硏究
윤석천,박서규,남재현,김무한 충남대학교 공업교육연구소 1985 論文集 Vol.8 No.1
The purpose of this study is to research an effect of aggregate size on the compressive strength of concrete. Tests were, therefore, made in sixteen classes of concrete : maximum aggregate sizes of 5, 10, 20, 30^mm with water cement rations of 40% and 60% and with AEA°cement rations of 0.00% and 0.03% for each maximum aggregate size. The results of this experiment are showing the fellowing tendency. 1. Generally, with the range of this experiment program, the smaller maximum aggregate size becomes, the higher the compressive strength of concrete gets. 2. The decreasing tate of the compressive strength of concrete gets higher in lean mix concrete than in rich mix concrete at each age. 3. The compressive strength of concrete is developed faster with not only the increase of maximum aggregate size but also the decrease of water cement ratio. And it shows that the rate of the compressive strength development is higher in AE concrete in spite of water cement ratio.