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通过对冻融循环后的多组混凝土试样进行单轴压缩以及3点弯曲强度测定,从损伤和能量的角度分析了不同冻融循环次数下试样的破损特征以及能量耗散的变化特点,并由此分析了冻融环境下混凝土材料的损伤劣化机理.研究表明:单轴压缩试验条件下,试样断裂需要吸收外载做功产生的能量会随着冻融循环次数的增加而逐渐降低;3点弯曲试验条件下,试样断裂需要吸收能量较少,断裂能随着冻融循环次数的增加而显著降低.显著的能量耗散使得混凝土材料逐步损伤并最终形成宏观破裂而强度整体丧失,为深入研究冻融环境下混凝土材料的力学性能和断裂特征奠定了理论基础.
By uniaxial compression and three-point bending strength test of concrete specimens after freeze-thaw cycles, the damage characteristics and the energy dissipation characteristics of the specimens under different freeze-thaw cycles were analyzed from the perspective of damage and energy. The damage mechanism of concrete under freezing-thawing condition is analyzed, and the results show that under the uniaxial compression test, the energy required to break the specimen after absorbing external work loads decreases with the increase of the number of freeze-thaw cycles. Under the condition of 3-point bending test, the fracture energy of the specimen needs less energy absorption, and the fracture energy can decrease significantly with the increase of the number of freeze-thaw cycles.The significant energy dissipation causes the concrete material to gradually damage and finally form a macroscopic rupture, Which laid a theoretical foundation for further study on the mechanical properties and fracture characteristics of concrete under freezing-thawing conditions.