荷载与环境复合因素作用下混凝土结构耐久性研究现状

Research of the durability of concrete structures under combined action of load and environmental factors

综合评述了目前荷载与环境因素共同作用下混凝土耐久性的研究进展情况,着重介绍了荷载(应力)对混凝土抗碳化、抗氯盐和硫酸盐侵蚀,抗冻融性能方面的研究成果。得出一致结论:随着拉应力水平的提高,混凝土耐久性降低;随着压应力水平的提高,混凝土耐久性提高,但当压应力超出临界应力范围,混凝土耐久性反而降低。因此,荷载是耐久性研究中不可忽视的因素之一。

Recent progress in study of concrete durability under simultaneous action of load and environmental factors was reviewed comprehensively, with a focus on research result of the influence of load （stress） on concrete carbonation resis- tance,salt corrosion resistance, sulfate erosion resistance and freeze-thawing resis- tance. Conclusions were obtained that, with the increase of the tensile stress level, the durability of concrete reduces, with the increase of the pressure level, the durability of concrete increases, but when the stress level and pressure level are beyond the critical stress range, the durability of concrete declines. Therefore,load is one of the important factors that can not be ignored in the study of concrete durability.