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首页> 外文期刊>Journal of materials in civil engineering >Residual Mechanical Properties of High-Strength Concretes after Exposure to Elevated Temperatures
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Residual Mechanical Properties of High-Strength Concretes after Exposure to Elevated Temperatures

机译：暴露于高温后高强度混凝土的残余力学性能

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摘要

This paper presents the results of a study on the effect of high temperatures on the mechanical properties of high-strength concretes. Mixtures were prepared with water to cementitious material ratios of 0.40, 0.35, and 0.30 containing silica fume at 0, 6, and 10% cement replacement. After heating to 100, 200, 300, and 600℃, the compressive strength, the splitting tensile strength, and the corresponding ultrasonic pulse velocity were measured. A substantial loss of strength was observed for all compositions at 600℃, particularly the silica fume concretes in spite of the superior mechanical properties provided by silica fume at room temperature. The average residual compressive and splitting tensile strengths of the concretes at 600℃ were 30 and 25% of the room-temperature strengths, respectively. It was found that the rate of the splitting tensile strength loss is higher than the rate of the compressive strength loss at elevated temperatures and that the ultrasonic pulse velocity measurements slightly underestimates the residual strength of the high-strength concretes after exposure to temperature over 200℃.
机译：本文介绍了高温对高强度混凝土力学性能影响的研究结果。制备的水与胶凝材料之比为0.40、0.35和0.30，其中硅粉的比例为0、6和10％。在加热到100、200、300和600℃后，测量其抗压强度，劈裂抗张强度和相应的超声脉冲速度。尽管在室温下硅粉提供了优越的机械性能，但在600℃下，所有组合物，特别是硅粉混凝土，都观察到了强度的实质损失。混凝土在600℃的平均残余抗压强度和劈裂抗拉强度分别为室温强度的30％和25％。结果表明，在高温下劈裂抗拉强度的损失率高于抗压强度的损失，超声脉冲速度测量结果略微低估了高强度混凝土在200℃以上暴露后的残余强度。 。

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