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압축강도 및 가열속도에 따른 콘크리트의 내부수증기압 평가
최경철,김규용,민충식,이태규,남정수 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9
When fire occurs, Constucture is dameged. Because concrete under high temperature can occur spalling. According to previous studies, Spalling is related with vapor pressure of concrete. Vapor pressure has different behavior with concrete compressive strength and Heating rate. In this study, Spalling and Vapor pressure were evaluated with compressive strength and Heating rate. Concrete compressive strength are 27, 40, 60, 80, 100㎫ and Heat by ISO-834 standard fire curve and 1℃/min. In the result, In case of ISO-834 Spalling occurs in All specimen except 27㎫. and In 1℃/min, All specimen didn't occur spalling except 100㎫. And water vapor pressure was increased With the increasing strength. But the specimen occurred spalling, water vapor pressure is low.
고온가열을 받는 초고강도 콘크리트의 압축강도저하 모델 제안
최경철 ( Gyeong Choel Choe ),김규용 ( Gyu Yong Kim ),윤민호 ( Min Ho Yoon ),이영욱 ( Young Wook Lee ),이보경 ( Bo Kyeong Lee ),김홍섭 ( Hong Seop Kim ) 한국건축시공학회 2014 한국건축시공학회 학술발표대회 논문집 Vol.14 No.2
Study on high temperature properties of concrete and internal force estimation of structural member subjected to high temperature mainly applied high temperature strength model based on experimental results with concrete under 40MPa. However, it is reported that degradation of internal force at high temperature and spalling of ultra high strength concrete are higher than that of normal strength concrete. Therefore, this study attempts to propose compressive strength degradation model which is suitable to ultra high strength concrete comparing to existing model by evaluating high temperature properties of ultra high strength concrete.
최경철 ( Gyeong Choel Choe ),김규용 ( Gyu Yong Kim ),윤민호 ( Min Ho Yoon ),이영욱 ( Young Wook Lee ),황의철 ( Ui Chul Hwang ),유재철 ( Jae Chul Yoo ) 한국건축시공학회 2015 한국건축시공학회 학술발표대회 논문집 Vol.15 No.1
In this study, stress-strain, thermal expansion strain, total strain and high temperature creep strain of ultra-high-strength concrete with compressive strengths of 80, 130, and 180MPa were experimentally evaluated considering elevated temperature and loading condition. Also, transient creep strain has been calculated by using the results of experiment. Experimental coefficient K was proposed with application of non-steady state creep model. It is considered that the experimental results of this study could be baseline data for deformation behavior analysis of ultra-high-strength concrete.
최경철 ( Gyeong Choel Choe ),김규용 ( Gyu Yong Kim ),윤민호 ( Min Ho Yoon ),이영욱 ( Young Wook Lee ),황의철 ( Ui Chul Hwang ),이보경 ( Jae Chul Yoo ) 한국건축시공학회 2015 한국건축시공학회 학술발표대회 논문집 Vol.15 No.2
In this study, spalling property were evaluated from concrete with compressive strengths of 30MPa, 90MPa, 180MPa, applied with fast heating condition(ISO-834 standard heating curve) and slow heatign condition(1℃/min). As a result, the spalling property of concrete was shown differently with compressive and heatign rate. And It could be separated three as non spalling, surface spalling and explosive spalling.
원자력 발전소 시설에 있어서 콘크리트의 건조밀도 평가에 관한 연구
최경철 ( Gyeong Choel Choe ),김규용 ( Gyu Yong Kim ),남정수 ( Jeong Soo Nam ),임창혁 ( Chang Hyuck Lim ),신경수 ( Kyoung Su Shin ),백용관 ( Yong Kwan Baik ) 한국건축시공학회 2010 한국건축시공학회 학술발표대회 논문집 Vol.10 No.2
The facilities producing the nuclear energy chosen for resolving the recent global energy problem have been increasingly constructed, and hence more frequent durability tests on radiation shielding concrete are required due to NPP(Nuclear Power Plant) life extension and increase of radioactive waste repositories. Bulk dry density is one of the critical factors ensuring the durability and performance of the radiation shielding concrete because the design of the radiation shielding reinforced concrete structures for NPPs is based on the bulk dry density of the concrete. Bulk density of unconsolidated shielding concrete can be calculated utilizing a test assuring to satisfy the bulk dry density, or existing credible data set. This study evaluated correlation between bulk density and bulk dry density of the concrete used for Korean NPPs (y=0.9534X+0.0714) and developed a correlation expression considering standard deviation of bulk dry density (y=0.9534X-0.0156).
현장 적용성을 고려한 섬유혼입 초고강도 콘크리트의 내화성능 평가
최경철 ( Gyeong Choel Choe ),김규용 ( Gyu Yong Kim ),이태규 ( Tae Gyu Lee ),민충식 ( Choong Siek Min ),구경모 ( Kyung Mo Koo ),신경수 ( Kyoung Su Shin ) 한국건축시공학회 2011 한국건축시공학회 학술발표대회 논문집 Vol.11 No.1
Recently, It has increased to use ultra high strength concrete. It is effective to mix organic fibers for preventing spalling. But if fiber mixed, flowability of concrete is decreases. The aim of this study is to evaluation of fire resistance performance for fiber-mixed ultra high strength concrete on field application. As a result, flowability of nylon fiber mixed concrete is better than polyethylene fiber mixed. In non-fiber and polyethylene fiber mixed concrete, spalling occurred. And strain converged at 0.004. Also, residual strength could not evaluate. Nylon fiber mixed concrete is effective to prevent spalling. And it remians 50% residual strength compare with compressive strength at room temperature.
바탕모르타르 균열부의 탄산화에 미치는 표면마감재의 $CO_2$ 투과성능의 영향
미야우치 히로유키,구경모,최경철,김규용,박연진,신경수,Hiroyuki, Miyauchi,Koo, Kyung-Mo,Choe, Gyeong-Choel,Kim, Gyu-Yong,Park, Yeun-Jin,Shin, Kyoung-Su 대한건축학회 2012 대한건축학회논문집 Vol.28 No.3
The purpose of this study is to investigate the carbonation resistance of building coating materials applied to the mortar or concrete substrate including their cracked zone. The testing parameters for this experiment were the three crack widths in the substrate including non-crack, and two types of the coating materials. As results, the coating materials have good carbonation resistance against $CO_2$ penetration into mortar substrate even in cracked zone of substrate. Furthermore, the carbonation resistance of coating material was calculated by using their $CO_2$ permeability coefficient and discussed from viewpoint of durability design.
역학변색센서를 이용한 콘크리트의 표면 변형 감지에 관한 기초 연구
남정수(Nam, Jeong Soo),최경철(Choe, Gyeong Choel),편수정(Pyeon, Su Jeong),이예찬(Lee, Yae Chan),김홍섭(Kim, Hong Seop),김규용(Kim, Gyu Yong) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
이 연구에서는 건축구조물의 효율적 유지관리 기법을 제안하기 위하여 물리적 변형을 색상변화로 나타내는 역학변색센서를 이용해 콘크리트의 표면 변형의 감지성능에 관한 기초연구를 수행하였다. In this study, a basic study was conducted on the detection performance of surface deformation of concrete using a mechanochromic sensor in order to propose an efficient maintenance method for building structures.