混凝土冻融循环后动力性能的研究现状与发展趋势

Research Status and Development Trend of Dynamic Properties of Concrete after Freeze-thaw Cycle

随着寒区混凝土的迅速发展,由冻融循环导致的结构破坏得到了广泛的关注。目前,针对混凝土冻融循环后力学性能的研究主要集中在静力性能方面,但寒区混凝土结构在使用过程中除了受静力作用外,还需承受动力作用。因此,本文归纳了现有关于混凝土冻融循环作用后动力性能的有关研究,并进一步探讨了混凝土抗冻性能的发展趋势,对寒区混凝土结构的研究和应用具有重要意义。本文的研究结果表明:针对新型混凝土材料冻融循环作用后动力性能的研究存在研究材料较匮乏、分析不够深入等问题;混凝土冻融循环作用后动力性能的细观特征研究需扩宽研究途径;在冻融循环和疲劳荷载双重因素作用下,混凝土的动力性能具有应变率效应。

With the rapid development of concrete in cold regions,the structural damage caused by freeze-thaw cycles has received extensive attention.Studies on the mechanical properties of concrete after freeze-thaw cycles mainly focus on the static properties,but concrete structures in cold regions are subjected to dynamic effects in addition to the static impacts during service.Therefore,this paper summarizes the existing research on the dynamic properties of concrete after freeze-thaw cycles and further discusses the development trend of concrete freezing resistance,which is of great significance for the research and application of concrete structures in cold regions.This paper's results show a lack of research materials and in-depth analysis of the dynamic properties of new concrete materials after freeze-thaw cycles.The study of the fine characteristics of the dynamic properties of concrete after freeze-thaw cycles needs to be expanded.The dynamic properties of concrete have strain rate effects under the action of both freeze-thaw cycles and fatigue loading.