CAJ | 학술논문

为研究高温下高强混凝土（HSC ）的导热系数，对6种工况下的高强混凝土试件进行了高温试验，得到不同高温下高强混凝土的内部温度场。基于一维热传导理论和实测温度，利用差分原理推导的离散温度点表示的导热系数计算公式，反演分析了高温下高强混凝土的导热系数，并分析了高温下导热系数的变化规律及变异性；最后建立了高温下高强混凝土导热系数的计算公式。研究结果表明：高温下高强混凝土内部的温度变化可以分为3个阶段，高温下高强混凝土的导热系数随着温度的升高而逐渐降低，但是在200℃～400℃时出现反弹现象，500℃后趋于稳定；利用所建立的导热系数公式计算的温度场与相关文献中试验结果吻合较好。
위연구고온하고강혼응토（HSC ）적도열계수，대6충공황하적고강혼응토시건진행료고온시험，득도불동고온하고강혼응토적내부온도장。기우일유열전도이론화실측온도，이용차분원리추도적리산온도점표시적도열계수계산공식，반연분석료고온하고강혼응토적도열계수，병분석료고온하도열계수적변화규률급변이성；최후건립료고온하고강혼응토도열계수적계산공식。연구결과표명：고온하고강혼응토내부적온도변화가이분위3개계단，고온하고강혼응토적도열계수수착온도적승고이축점강저，단시재200℃～400℃시출현반탄현상，500℃후추우은정；이용소건립적도열계수공식계산적온도장여상관문헌중시험결과문합교호。
In order to study the thermal conductivity of high-strength concrete (HSC) under high temperatures ,the high temperature experiments for six types of HSC specimens were conducted and the internal temperature fields of HSC under different high temperatures were recorded .The calculation formulae of thermal conductivities of HSC under high temperatures were derived based on the back-analysis of one dimension heat conduction theory ,measured temperatures and the equation for thermal conductivity expressed by discrete temperature values derived by difference principles .Meanwhile ,the changing regularities and variability of the thermal conductivity under high temperatures were analyzed .At last ,the calculation formulae for the thermal conductivity of HSC under high temperatures were established . The study results show that the internal temperature variation of HSC under high temperatures can be divided into three phases . The thermal conductivity under high temperatures of HSC will decrease with the increasing of temperature .But the thermal conductivity rebounds at 200 ℃-400 ℃ and tends to stabilize w hen the temperature is beyond 500 ℃ .The temperature fields calculated by the proposed formulae are in good agreement with those of other test results in relative literature .