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通过4种强度等级混凝土受压试验,探讨经受-190℃作用再回至常温的温度作用工况下混凝土的受压性能。结果表明,不同强度等级混凝土受压强度受温度作用的影响不同。较高强度等级混凝土受压强度下降很少;而低强度等级则恶化明显,其受压强度最大降幅超过20%。经历超低温作用不同回温方式对混凝土受压强度影响也不同,由超低温直接回至常温方式导致的混凝土受压强度恶化更明显。由试验获得的混凝土经历-190℃再回至常温的受压强度与其常温强度间关系,可为合理地设计LNG储罐等混凝土结构提供参考。
Through the concrete compressive tests of four strength grades, the compressive performance of the concrete subjected to the action of -190°C and returning to normal temperature is discussed. The results show that the compressive strength of concrete of different strength grades is affected by the effect of temperature. The compressive strength of concrete with a higher strength level decreases little; while the low strength grade deteriorates significantly, and its compressive strength decreases by a maximum of more than 20%. The effect of ultra-low temperature on the effect of different temperature-recovery methods on the compressive strength of concrete is also different, and the compressive strength of concrete caused by the direct return from ultra-low temperature directly to room temperature is more pronounced. The relationship between the compressive strength of the concrete obtained from the experiment and the ambient temperature at -190°C and back to room temperature can provide a reference for the rational design of concrete structures such as LNG tanks.