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在分析混凝土荷载损伤后混凝土劣化机理的基础上,通过短期轴拉和短期轴压静载后混凝土抗氯离子侵蚀和抗冻性性能试验,研究荷载损伤对混凝土长期耐久性能的影响。结果表明:受压荷载作用下混凝土依次经历可逆、不可逆和加速劣化三个劣化阶段,受拉荷载下混凝土表现为耐久性持续劣化。在65%和75%轴拉荷载水平,混凝土表观氯离子扩散系数分别增加了6.4%和34%,表面氯离子浓度分别增大了10%和40%,显现出轴拉荷载的“负效应”;随着轴压荷载水平的增加,混凝土抗冻性能经历一个“正效应”到“负效应”的转变。
Based on the analysis of concrete degradation mechanism after concrete load damage, the effect of load damage on the long-term durability of concrete was studied through the tests of resistance to chloride ion erosion and frost resistance of concrete after short-term axial compression and short-term axial compression. The results show that concrete under compressive load undergoes three stages of reversible, irreversible and accelerated degradation in turn, and the durability of concrete under continuous tensile loading is deteriorating. At 65% and 75% axial load, the apparent chloride ion diffusion coefficient of concrete increased by 6.4% and 34%, respectively, and the surface chloride ion concentration increased by 10% and 40%, respectively, Effect “. With the increase of axial load, the frost resistance of concrete undergoes a” positive effect “to” negative effect "transformation.