• 제목/요약/키워드: high temperature strength

검색결과 3,002건 처리시간 0.035초

고온수열된 고강도콘크리트의 압축강도에 관한 실험적 연구 (An Experimental Study on the Compressive Strength of High Strength Concrete Heated High.)

  • 강병희;오창희
    • 한국화재소방학회논문지
    • /
    • 제3권2호
    • /
    • pp.3-10
    • /
    • 1989
  • The results on high strength concrete by heating high are as follows: 1. High strength concrete appeared an estimated 5.5% higher than ordinary concrete in the central temperature of specimens by heating. 2. High strength concrete is higher than ordinary concrete in the decreased width of the ratio on the residual compressive strength by heating high. According to heating temperature and time, the inferred formula of compressive strength on high strength concrete showed: Fc=-0.53Te -2.4Ti +748.4

  • PDF

등가재령방법에 의한 혼화재 종류별 콘크리트의 압축강도 증진해석 (Estimation of the Compressive Strength of the Concrete incorporating Mineral Admixture based on the Equivalent Age Method)

  • 한민철;한천구
    • 한국건축시공학회지
    • /
    • 제7권1호
    • /
    • pp.71-77
    • /
    • 2007
  • This paper is to investigate the effect of the curing temperature on strength development of concrete incorporating cement kiln dust(CKD) and blast furnace slag (BS) quantitatively. Estimation of the compressive strength of the concrete was conducted using the equivalent age equation and the rate constant model proposed by Carino. Correction of Carino model was studied to secure the accuracy of strength development estimation by introducing correction factors regarding rate constant and age. An increasing curing temperature results in an increase in strength at early age, but with the elapse of age, strength development at high curing temperature decreases compared with that at low curing temperature. Especially, the use of BS has a remarkable strength development at early age and even at later age, high strength is maintained due to accelerated pozzolanic activity resulting from high temperature. Whereas, at low curing temperature, the use of BS leads to a decrease in compressive strength. Accordingly, much attention should be paid to prevent strength loss at low temperature. Based on the strength development estimation using equivalent age equation, good agreements between measured strength and calculated strength are obtained.

AL 2024-T3의 단시간 고온 강도 특성 (Strength Characteristics of An Aluminum 2024-T3 in Short-time High Temperature Environment)

  • 이열화;김재영;김헌주;박경민;김종환
    • 한국군사과학기술학회지
    • /
    • 제4권1호
    • /
    • pp.255-263
    • /
    • 2001
  • The main purpose of this paper is to investigate strength characteristics of Aluminum 2024-T3 in high temperature environment. Tensile test of Aluminum 2024-T3 has been carried out in high temperature environment. The stress-strain relations are investigated with temperature and Young's modulus, yield strength and ultimate strength are deduced from the test results. The modulus and strength of the test are compared with those of MIL HANDBOOK and tips on structural design in high temperature environment are suggested.

  • PDF

초기고온이력이 고강도콘크리트의 압축강도특성에 미치는 영향 (The Effect of Properties of The Compressive Strength of High-Strength Concrete under High Temperature conditions at an Early Age)

  • 함은영;김규용;구경모;윤민호;유재강;미야우치 히로유키
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2013년도 춘계 학술논문 발표대회
    • /
    • pp.115-116
    • /
    • 2013
  • Property of the compressive strength of high strength concrete was investigated in adiabatic temperature history considering hot-weather conditions. As a result, compressive strength of specimens subjected to high temperature history showed more than 120% at 3days of age compare to standard cured specimens. But, at 91days of age showed the incidence of strength less than 100%.

  • PDF

TiC-Mo 공정복합재료의 고온 변형특성 (Deformation Properties of TiC-Mo Eutectic Composite at High Temperature)

  • 신순기
    • 한국재료학회지
    • /
    • 제23권10호
    • /
    • pp.568-573
    • /
    • 2013
  • The deformation properties of a TiC-Mo eutectic composite were investigated in a compression test at temperatures ranging from room temperature to 2053 K and at strain rates ranging from $3.9{\times}10^{-5}s^{-1}$ to $4.9{\times}10^{-3}s^{-1}$. It was found that this material shows excellent high-temperature strength as well as appreciable room-temperature toughness, suggesting that the material is a good candidate for high-temperature application as a structure material. At a low-temperature, high strength is observed. The deformation behavior is different among the three temperature ranges tested here, i.e., low, intermediate and high. At an intermediate temperature, no yield drop occurs, and from the beginning the work hardening level is high. At a high temperature, a yield drop occurs again, after which deformation proceeds with nearly constant stress. The temperature- and yield-stress-dependence of the strain is the strongest in this case among the three temperature ranges. The observed high-temperature deformation behavior suggests that the excellent high-temperature strength is due to the constraining of the deformation in the Mo phase by the thin TiC components, which is considerably stronger than bulk TiC. It is also concluded that the appreciable room-temperature toughness is ascribed to the frequent branching of crack paths as well as to the plastic deformation of the Mo phase.

증기양생 온도조건에 따른 조강시멘트 콘크리트의 강도발현특성 및 내염특성 (The Characteristics of the Strength Development and Chloride Attack Resistance on the Concrete using High Early Strength Cement by Steam Curing Temperature Condition)

  • 이웅종;이원암;엄태선;이종열
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
    • /
    • pp.599-602
    • /
    • 2005
  • In this research, the characteristics of the strength development and chloride attack resistance on the concrete using high early strength cement by steam curing temperature condition were studied. As a result, It is observed that the early strength(16hr) is increasing and the strength of 28 days is decreasing, according as the rising of the steam curing temperature without the kinds of base cement(OPC and high early strength cement). On the other hand, it is observed that the more the contents of the unit binder(base cement + GGBF) is abundant, the more the steam curing temperature can be reduced in case of the high early strength. Also, the chloride attack resistance is improved according as the amount of GGBF is increased with the kinds of base cement(OPC and high early strength cement).

  • PDF

혼화재 치환 콘크리트의 압축강도 증진해석 (Estimation of Compressive Strength of Concrete Incorporating Admixture)

  • 주은희;배장춘;한민철;손명수;전현규;한천구
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2005년도 추계 학술논문 발표대회
    • /
    • pp.75-78
    • /
    • 2005
  • This raper investigates the effect of curing temperature on strength development of concrete incorporating cement kiln dust(CKD) and blast furnace slag (BS) quantitatively. Estimation of compressive strength of concrete was conducted using equivalent age equation and rate constant model. An increasing curing temperature results in an increase in strength at early age, but with the elapse of age, strength development at high curing temperature decreases compared with that at low curing temperature. Especially, the use of 35 has a remarkable strength development at early age and even at later age, high strength is maintained due to accelerated pozzolanic activity resulting from high temperature. Whereas, at low curing temperature, the use of BS leads to a decrease in compressive strength. Accordingly, much attention should be paid to prevent strength loss at low temperature. Based on the strength development estimation using equivalent age equation, good agreements between measured strength and calculated strength are obtained.

  • PDF

고온을 받은 나일론 섬유보강 고강도 콘크리트의 크리프 거동 (Creep Behavior of Nylon Fiber Reinforced High Strength Concrete at Elevated Temperature)

  • 이영욱;김규용;최경철;윤민호;이보경;김래환
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2014년도 추계 학술논문 발표대회
    • /
    • pp.141-142
    • /
    • 2014
  • Decrease of performance degradation of High Strength Concrete occurs more than that of normal strength concrete at elevated temperature. Therefore, when it comes to evaluating performance of structures, strain of concrete subjected to elevated temperature and loading are important items. In this study, creep strain of High Strength Concrete sunjected to various temperature conditions and 33% loading was evaluated. As a result, creep strain increased with increase of temperature and loading. Creep strain of concrete at high temperature is influenced by loading.

  • PDF

가열을 받은 초고강도 콘크리트 기둥부재의 잔골재 종류에 따른 내부온도이력 및 잔존압축강도 평가 (Evaluation on Temperature History and Residual Compressive Strength of Heated Ultra High Strength Concrete Column according to the Fine Aggregate Type)

  • 윤민호;김규용;신경수;최경철;이보경;미야우치 히로유키
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2013년도 춘계 학술논문 발표대회
    • /
    • pp.91-92
    • /
    • 2013
  • The strength of ultra-high-strength concrete can be reduced even if the spalling is prevented at a high temperature. Therefore, in this study, we measured internal temperature history and residual compressive strength using a 300×300×450mm short column specimens which use the fiber(NY 0.15+PP 0.10+SF 0.30vol·%) and respectively silica sand, washed sand, the slag sand. As a result, the temperature history and residual compressive strength are almost similar regardless of the fine aggregate types.

  • PDF

고온시 $40{\sim}100MPa$ 범위의 콘크리트 열적특성에 관한 실험적 연구 (An Experimental Study on the Thermal Properties of High Strength Concrete in the Range of $40{\sim}100MPa$ at High Temperature)

  • 김흥열;전현규
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 2006년도 추계 학술발표회 논문집
    • /
    • pp.425-428
    • /
    • 2006
  • In order to estimate the reduction of laodbearing capacity, followed by the attributive change of heat while high strength concrete structure is revealed on fire it is necessary to evaluate, it is necessary to evaluate the property of material under high temperature such as thermal conductivity, specific heat, compressive strength, modulus of rigidity and diminution figure. Therefore, this study is for the purpose of presenting evaluation data for the analysis of thermal behavior about the high strength concrete material under high temperature, through the experiment by manufacturing concrete(40, 50, 60, 80, 100 MPa) commonly used in the construction field. As a result of the study, in the case of physical attribute, it demonstrates a greater fluctuation of change than the one of 30 MPa concrete. In case of specific heat, the high strength concrete, shown the serious diminution between $500{\sim}600^{\circ}C$, presents the thermal change area corresponding to the change of high strength concrete. In compressive strength, regardless of intensity of concrete, all of them show the first intensity loss between normal temperature and $100^{\circ}C$, the dramatic loss beyond $400^{\circ}C$. The concrete weighing above 50 MPa shows a twice lower dramatic intensity loss than the one weighing $30{\sim}40MPa$. The concrete ranging from $60{\sim}80MPa$, shows the biggest diminution of modulus of elasticity under $400^{\circ}C$, which implies the structural unstability of temperature.

  • PDF