LNG储罐混凝土超低温冻融损伤演化规律

Damage Evolution Law of LNG Tank Concrete Subjected to Cryogenic-Temperature Freeze-Thaw Cycles

摘要:

为明确泄漏工况下液化天然气（LNG）储罐混凝土超低温冻融损伤演化规律，进行了C50混凝土的超低温冻融试验，并与快速冻融试验结果进行对比，通过相对动弹性模量来评估LNG储罐混凝土的冻融损伤累积.结果表明：快速冻融试验无法真实反映LNG储罐混凝土在超低温冻融条件下的损伤演化规律；基于Weibull分布理论，建立了实验室模拟冻融循环条件与储罐泄漏工况下混凝土冻融损伤的等效关联，为后续相关研究提供理论基础.

Abstract:

To clarify the evolution law of cryogenic-temperature freeze-thaw damage of liquefied natural gas（LNG） tank concrete under leakage condition， the cryogenic-temperature freeze-thaw tests on C50 concrete were conducted， and compared with the rapid freeze-thaw test results. Relative dynamic elastic modulus was adopted to evaluate the damage accumulation of LNG tank concrete. The results indicate that the rapid freeze-thaw test cannot truly reflect the damage evolution law of LNG tank concrete under cryogenic-temperature freeze-thaw conditions. Based on the Weibull distribution theory， the damage equivalent correlation between the laboratory-simulated freeze-thaw cycle conditions and the actual LNG tank leakage conditions is established， which can lay a theoretical foundation for the subsequent related research.