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플라이애시를 혼입한 기포콘크리트의 압축강도 특성에 관한 실험적 연구
오세출(Oh Se-Chul),서치호(Seo Chee-Ho),지석원(Ji Suk-Won) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.4
This study aims at the production of foamed concrete mixed with fly-ash, examInIng the variation of the mechanical properties of foamed concrete, and issuing the data to site engineers for quality control. The experiment began by mixing the fly-ash by a maximum of 60% in stages and the mixing was mainly based on practical mixture. The following results were obtained from the experiment. In the instance of replacing cement with fly-ash. the outlook specific gravity and the water absorption ratio appeared not to be affected, while the compressive strength tended to decrease inversely proportional to the increasing fly-ash as compared to foamed concrete mixed with only cement. However, under long cure periods, an improvement in compressive strength was observed strength. As earlier stated, the pozzolanic reaction of the fly-ash contributed to the increased strength and also assisted in recovering the narrow range of the strength increased ratio obtained at early cure periods.
건설폐목을 이용한 목질계보드의 시멘트응결 특성에 관한 실험적 연구
김세환,오세출,Kim, Sae Hoan,Oh, Sae Chool 한국건설순환자원학회 2007 한국건설순환자원학회지 Vol.3 No.1
In this study we experimented setting time and basic properties as waste wood fiber and sodium silicate substitution rate to reuse waste wood fiber produced in construction field to wood chip board. To do this construction waste woods were crushed with the size less than 10mm, mixed with the rate of 1:2, 2.5, 3, and added sodium silicate with the rate of 0, 5% of cement content. The results are as follows. As the substitution rate of construction waste wood was increased delay of setting time was also increased, and the batch of adding 5% accelerator had a 13~17 hours faster setting time than non accelerator batch. The compressive strength was lower as wood substitution rate was higher, and as the specific gravity was higher, the strength was also higher. As wood substitution rate was higher, heat conductivity was lower, and as specific gravity was higher, heat conductivity also was higher.
교육시설(敎育施設)의 리모델링을 위한 구성재료(構成材料)의 노후화(老朽化) 판정기준(判定基準) 작성(作成)(II)
서치호(Seo, Chee-Ho),최민권(Choi, Min-Kwon),최수경(Choi, Soo-Kyung),오세출(Oh, Se-Chul) 한국교육시설학회 2003 敎育施設 Vol.10 No.5
Deterioration of the educational facilities built before 1985 is a serious situation. The purpose of this study is to present the efficient remodeling method of old educational facilities. This paper, part II, presents the systemic and synthetic judgment method of deterioration grade of structural components. Deterioration grade of the whole structural components are judged by synthetic evaluation score which is the total of the score of ten evaluation items. And we added the importance coefficient of the viewpoint of four performance to each evaluation item.
이문환 ( Lee Mun-hwan ),정미경 ( Jung Mi-kyung ),오세출 ( Oh Se-chul ),서치호 ( Seo Chee-ho ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 논문집 Vol.3 No.4
This study attempts to propose an evaluation considering the property of concrete pore which affects the deterioration of neutralization and the re-bar resistance of concrete. Understanding pore property of concrete in using extent, for practical using of concrete manufacturing condition, basic quality property and durability estimation etc, the results of the experiment are as follows. 1) The result of analysis pore property of every specimen with the method of area ratio, in limitation of 10<sup>-6</sup>~10<sup>-5</sup>m, the pore distribution ratio was maximum. It was high value as W/C was increased and the unit cement content was decreased. 2) In case of using admixture, the volume of pores was some increased as variation of mixing content. In high W/C range, it was very increased compared with plain concrete. 3) Concerned with compressive strength and volume of pores in hardened concrete, it is possible compressive strength estimation using the property of concrete pores. 4) Direct measurement of concrete pore property is difficult, the valuation of the dynamic modulus of elasticity using ultrasonic wave velocity was available. 5) Quantitatively evaluation of concrete structure durability by past result of pore distribution estimation, and it can be estimative scale of property study on the concrete materials.
교육시설(敎育施設)의 리모델링을 위한 구성재료(構成材料)의 노후화(老朽化) 판정기준(判定基準) 작성(作成)(III)
서치호(Seo, Chee-Ho),최민권(Choi, Min-Kwon),최수경(Choi, Soo-Kyung),오세출(Oh, Se-Chul),권용균(Kwon, Yong-Kyun) 한국교육시설학회 2004 敎育施設 Vol.11 No.1
Deterioration of the educational facilities built before 1985 is a serious situation. The purpose of this study is to present the efficient remodeling method of old educational facilities. This paper, part III, presents the systemic and synthetic judgment method of deterioration grade of finished materials. Evaluation of the deterioration is carried out in every eight classrooms or building elements divided by the use. And classrooms are divided by several parts for example floor, wall and ceiling etc.. The whole deterioration of the building judges the result of every part collectively.
발포폴리스티렌비드를 사용한 경량콘크리트의 역학적 특성에 관한 실험적 연구
주재금,이종찬,오세출,유택동,정광량,서치호 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
The purpose of this study is to obtain basic data on the properties of the lightweight concrete within expanded polystyrene beads for various applications in the field. Inquiring into the change of the properties as altering cement matrix mixture and the capacity mixture ratio of expanded polystyrene beads, the mixture plane of this study is set up as W/C is fixed 50%, expanded polystyrene beads is increased 10% from 0% to 80% per 1m³ and the ratio of cement:sand in the cement matrix is 1:0, 1:0.5, 1:1. The results of this study are as follow. The slump as changing the mixture ratio of expanded polystyrene beads decrease smoothly until mixture ratio 50% but decrease rapidly being in excess of 50%. The density decrease regularly as the mixture ratio of expanded polystyrene beads increase but the ratio of strength decrease. The difference of cement matrix. The strength of cement matrix having more sand mixture ratio relatively decrease rapidly as increasing the mixture ratio of expanded polystyrene beads. It is judged decreased strength phenomenon as the quantity of coherent material created in the mixture decrease rapidly.