減水劑를 添加한 큰크리트의 强度特性에 關한 硏究

郭基柱 順天大學校 1985 論文集 Vol.4 No.1

This study on the purpose of investigating the strength properties of high strength conrete was set about with the failure test after making the specimen with concrete added by water reducing agent. The results of studying are as follows; The use of water reducing agent resulted in the possiblity of reducing the water cement ratio of which slump is 10㎝~13cm Concrete by under the rate of 40% Using water reducing agent 1 can raise the compressive strength which is 28days of material age to 800㎏/㎠ The rate between the compressive strength and tensible strength of the high strength concrete was approximately 16 Material age from 28days to one year of which the growth rate of Compressive strength was 20%, which was highest in the time of standard curing.

실리카흄을 이용한 고강도 콘크리트의 기초적 성질

곽기주,이경동,곽동림 한국농공학회 1997 韓國農工學會誌 : 전원과 자원 Vol.39 No.1

An experimental study of the application of Silica fume for the high strength concrete was conducted. Nine specimens with three different contents of silica fume, 0%, 10%, 20% and with three water-cement ratio 30%, 40%, 50% were tested. Results shows that 10% of silica fume and 30% of water-cement ratio has a maximum strength with 700kg/$cm^2$ of compressive strength and 64kg/$cm^2$ of splitting tensile strength and 100kg/$cm^2$ of flexural strength. Slump value of the tested samples decreases with increasing water-cement ratio and elapsed time of silica fume. Splitting tensile strength$({\sigma}_f)$ and flexural strength $({\sigma}_f)$ and static modulus of elasticity(E) can be correlated with compressive strength $({\sigma}_c)$ from a regression analysis.

전로슬래그를 이용한 콘크리트의 강도에 관한 연구

곽기주,손순종,김기성 한국콘크리트학회 1994 콘크리트학회지 Vol.6 No.4

본 연구는 전로슬래그를 콘크리트용 골재로 사용할 수 있는 가를 검토하기 위해서 수쇄슬래그에 전로슬래그를 중량비로 20%, 40%, 60%, 80%씩 혼합한 골재로 공시체를 제작하여 강도특성을 고찰하였다. 전로슬래그로 제작한 콘크리트의 슬럼프 값은 천연골재로 제작된 슬럼프 값보다 더 크게 나타났다. 또 수쇄슬래그에 전로슬래그를 혼입하여 제작된 콘크리트는 전로슬래그의 혼입율이 20%, 40%, 60%, 80%로 높아짐에 따라 팽창율도 0.007%, 0.014%, 0.043%, 0.19%로 각각 증가되었다. 따라서 비교적 안정성을 갖는 콘크리트를 제작하기 위해서는 수쇄슬래그와 전로슬래그의 혼입율을 60:40으로 하는 것이 좋을 것으로 생각된다. 또, 수쇄슬래그에 전로슬래그를 혼입하여 만든 콘크리트의 압축강도 (${\sigma}_c$), 인장강도(${\sigma}_t$), 휨강도(${\sigma}_f$)간의 상관관계를 회귀분석하여 도출한 인장강도와 휨강도의 예측공식은 다음과 같다. ${\sigma}_t$ = 0.16952${\sigma}_c$ - 4.9313 ${\sigma}_f$ = 0.25727${\sigma}_c$ + 6.0528 To examine the applicabilty of the converter furnace slag from iron-works as concrete aggregate respective concrete furnace slag with contents of 20%. 40%, 60%. 80% were mixed with granulated slag, and the strength and stability tests for these specimens were followed. The slump value of the concrete mixed with converter furnace slag was higher than that of the conventional concrete. Furnace slag and granulated slag was increased as the increase of converter furnace content. The strength of the concrete mixed with converter furnace slag and granulate slag increased as an increase of converter furnace content and age. The expansion rate of the concrete mixed with converter furnace slag and granulated slag increased from 0.007% to 0.19% as the converter furnace content changed from 20% to 80%. From the above results in the strength and expansion rate, the concrete with the converter furnace content of 40% was considered to be recommandable for the stable construction of the concrete. Calculated formulas for tensile strength(${\sigma}_t$) and flexural strength(${\sigma}_f$) from the regression a.nalysis of the correlations among these compressive strength (${\sigma}_c$), tensile strength and flexural strength are as follows. ${\sigma}_t$ = 0.16952${\sigma}_c$ - 4.9313 ${\sigma}_f$ = 0.25727${\sigma}_c$ + 6.0528

아스팔트 混合物의 破壞强度에 관한 考察

곽기주 순천대학교 공업기술연구소 1988 工業技術硏究所論文集 Vol.2 No.-

This study was conducted to investigate the failure properties of asphalt mixtures. The obtained results are as follows : 1) The discrepancy of temperature of asphalt concrete and rolled asphalt was about 6℃ at the condition of maximum compressive strength. 2) The bending strength of asphalt concrete was about double the tensile strength. 3) When maximum bending and tensile strength was occured, the temperature of asphalt concrete was keep constant at the fixed strain. 4) Even though the temperature of specimens was rising, the stiffness was decreased independent of strain at bending failure.

전로슬래그를 콘크리트용 골재로 사용하기 위한 실험적 연구

郭基柱,孫純鍾,徐炳鐵 순천대학교 공업기술연구소 1995 工業技術硏究所論文集 Vol.9 No.-

To examine the appicability of the converter slag to aggregate, tests were performed for the converter slag specimens aged with steam, and the stability of expansion was investigated. The strength of the specimen was determined through the fracture test, and the results were summarized as follow. The strength of the converter slag was found to be smaller than that of the natural aggregate. The strength of the concrete mixed with the granulate slag was increased with an increase of the content of the granulate slag. The slump value was larger for the specimen of converter slag than that for the natural aggregate. The specific weight of the converter slag was decreased with an increase of the aging peroid. The aging time for the converter slag was accessed to be about 48 hours to accommodate the full stability of the expansion. The amount of the steam needed to age one ton of the converter slag to the range of full expansion was accessed to be 60 ㎏. From the regression analysis of the correlations among the compressive strength (σ_c), tensile strength (σ_t), and flexural strength (σ_f) the following formulas were proposed. σ_t=0.150681·σ_c+4.451729 σ_f=0.1537·σ_c+30.47224

실리카흄을 이용한 고강도 콘크리트의 기초적 성질

곽기주,이경동,곽동림 순천대학교 기초과학연구소 1996 基礎科學硏究誌 Vol.7 No.-

An experimental study of the application of silica fume for the high strength concrete was conducted. Nine specimens with the variation of the contents of silica fume Owt%, 10wt%, 20wt% and that of water-cement ratio 30%, 40%, 50% were tested. Results show that 10% of silica fume and 30% of water-cement ratio has a maximum strength with 700kg/㎠ of compressive strength and 64kg/㎠ of splitting tensile strength and 100kg/㎠ of flexural strength. Slump value of the tested samples decreases with increasing water-cement ratio and elapsed time of silica fume. Splitting tensile strength(σ_t) and flexural strength(σ_f) and static modulus of elasticity (E) can be correlated with compressive strength(σ_c) from a regression analysis.

各種 纖維補强콘크리드 强度特性에 관한 硏究

郭基柱 순천대학교 공업기술연구소 1991 工業技術硏究所論文集 Vol.5 No.-

This study aims at investigating the strength properties of fiber reinforced concrete. Specimens were made from concrete reinforced by various kinds of fiber and the failure test was performed. The results analyzed are as follow: 1. As the fiber content was increased, the flexural strength of various kinds of fiber reinforced concrete was increased and the order of an increasing rate was steel fiber, glass fiber, vinylon fiber and carbon fiber. 2. As the fiber content was increased, the slump of various kinds of fiber reinforced concrete was increased and the order of an increasing rate was steel fiber, glass fiber, vinylon fiber and carbon fiber. 3. As the fiber content was increased, the air of various kinds of fiber reinforced concrete was increased. Especially in case of 1% fiber content, the order of an increasing rate was glass fiber, carbon fiber, vinylon fiber and steel fiber. 4. As the fiber content was increased, the flexural strength and the toughness index of the vinylon fiber reinforced concrete was increased and the increasing rate of the toughness index was still larger than that of the flexural strength.

산업부산물을 이용한 콘크리트의 강도에 관한 연구

郭基柱,孫純鐘,金基成 순천대학교 공업기술연구소 1994 工業技術硏究所論文集 Vol.8 No.-

To examine the applicability of the converter furnace slag from iron-works as concrete aggregate respective concrete furnace slag with contents of 20%,40%,60%,80% were mixed with granulated slag, and the strength and stability tests for these specimens were followed. The slump value of the concrete mixed with converter furnace slag was higher than that of the conventional concrete. Furnace slag and granulated slag was increased as the increase of converter furnace content. The strength of the concrete mixed converter furnace slag and granulate slag increased as an increase of converter furnace content and age. The expansion rate of the concrete mixed with converter furnace slag and granulated slag increased from 0.007% to 0.19% as the converter furnace content changed from 20% to 80%. From the above results in the strength and expansion rate, the concrete with the converter furnace content of 40% was considered to be recommandable for the stable construction of the concrete. Calculated formalas for tensile strength (σ_t) and flexural strength(σ_f) from the regression analysis of the correlations among these compressive strength (σ_c) tensile strength and flexural strength are as follows. σ_t = 0.16952σ_c - 4.9313 σ_f = 0.25727σ_c + 6.0528

실리카 흄을 이용한 콘크리트의 강도특성

곽기주,이경동 순천대학교 공업기술연구소 1995 工業技術硏究所論文集 Vol.9 No.-

The influences on the strength of various silica fume content 0%,10%,20% concrete have been investigated. The results indicated that a target value of slump was obtained by incorporation a fine silica fume without increasing unit water in concretes, The compressive strength of concrete increased with increasing silica contents and curing temperatures. It has been also found that higher compressive strength of concrete resulted in increased modulus of elasticity. From a regression analysis on modulus of elasticity and compressive strength, a general relationship for the modulus of elasticity was derived as follows. E = 0.003946σ_c + 0.679289

중유와 폐식용유의 온풍 난방기 연소특성

곽기주,조기현,강정일,정형길 한국기계기술학회 2009 한국기계기술학회지 Vol.11 No.4