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通过5种配合比混凝土的试验,探究了不同强度等级混凝土-190℃超低温下的受压强度性能。结果表明,-190℃时混凝土受压的宏观试验现象较常温明显地不同。破坏时脆性均显著,但破坏形态却基本相同。所有试件混凝土-190℃时的受压强度均显著地提高,但混凝土的强度等级对其影响较大,并且还取决于混凝土的含水率。该次试验的C30和C40混凝土-190℃时受压强度较常温可分别增幅达40%和65%,提高其含水率后竟与C50和C60混凝土增幅相近、达90%以上。根据该次试验结果与已有研究结果给出的不同强度等级混凝土-190℃时受压强度的计算模型,可用于LNG储罐等混凝土结构的设计和安全评估。
Through the test of five kinds of mix concrete, the compressive strength performance of concrete with different strength grade -190 ℃ was investigated. The results show that the macroscopic test phenomenon of compressive strength of concrete at -190 ℃ is obviously different from that under normal temperature. Breaking brittleness are significant, but the destruction of the form is basically the same. The compressive strength of all test specimens at -19 ℃ increased significantly, but the strength of concrete had a greater influence on it, and it also depended on the moisture content of concrete. The compressive strength of C30 and C40 concrete at -190 ℃ in this test can be increased by 40% and 65% respectively compared with normal temperature. After increasing the water content, the compressive strength of C30 and C40 concrete is almost 90% higher than that of C50 and C60 concrete. According to the test results and the existing research results, we can calculate the compressive strength at -190 ℃ of concrete with different strength grades and can be used in the design and safety evaluation of concrete structures such as LNG storage tanks.