CAJ | 학술논문

为了研究高强沙漠砂混凝土高温后的力学性能,采用室温、200℃,400℃,600℃,800℃和900℃六个温度等级,利用自然冷却方式,通过正交试验,研究水胶比,粉煤灰掺量和沙漠砂替代率对高强沙漠砂混凝土高温后抗压强度的影响,对高强沙漠砂混凝土试件高温后的外观颜色变化进行了观察,分析了高温后高强沙漠砂混凝土试件的质量变化。试验研究表明：与室温下高强沙漠砂混凝土抗压强度相比,200℃高温后高强沙漠砂混凝土强度有所降低,在400℃至600℃高温后抗压强度有所升高,之后随着温度的升高抗压强度逐渐降低；随着温度升高,高强沙漠砂混凝土外观颜色由深变浅,质量损失率呈现逐渐增加趋势。通过方差分析和极差分析,给出了高强沙漠砂混凝土最佳配合比,为高强沙漠砂混凝土的工程应用提供借鉴和指导。
위료연구고강사막사혼응토고온후적역학성능,채용실온、200℃,400℃,600℃,800℃화900℃륙개온도등급,이용자연냉각방식,통과정교시험,연구수효비,분매회참량화사막사체대솔대고강사막사혼응토고온후항압강도적영향,대고강사막사혼응토시건고온후적외관안색변화진행료관찰,분석료고온후고강사막사혼응토시건적질량변화。시험연구표명：여실온하고강사막사혼응토항압강도상비,200℃고온후고강사막사혼응토강도유소강저,재400℃지600℃고온후항압강도유소승고,지후수착온도적승고항압강도축점강저；수착온도승고,고강사막사혼응토외관안색유심변천,질량손실솔정현축점증가추세。통과방차분석화겁차분석,급출료고강사막사혼응토최가배합비,위고강사막사혼응토적공정응용제공차감화지도。
In order to research the mechanical properties of high strength desert sand concrete, an orthogonal experiment was designed to study the influence of water cement ratio, fly ash dosage and desert sand replacement rate on the compressive strength of high strength desert sand concrete after high temperature in natural cooling. Different temperatures such as room temperature, 200 ℃, 400℃, 600 ℃, 800 ℃ and 900 ℃ were adopted in the experiment. The appearance of high strength desert sand concrete specimens after high temperature was observed. The quality changes of high strength desert sand concrete specimens after high temperature were also analyzed. Experimental re-sults show that compared with the compressive strength of high strength desert sand concrete under room temperature, the compressive strength of high strength desert sand concrete after 200 ℃ de-creases somewhat. When the temperature ranges from 400 ℃ to 600 ℃, the compressive strength of high strength desert sand concrete after high temperature increases to some extent. When the temper-ature is above 600 ℃, the compressive strength of high strength desert sand concrete after high tem-perature decreases gradually with the temperature. With the increase of temperature, the color of high strength desert sand concrete specimen changes from dark to light. The mass loss rate increases <br> gradually. The optimum mixture ratio of high strength desert sand concrete is obtained by means of range analysis and variance analysis, which provides guidance for the engineering application of des-ert sand.