混凝土抗冻耐久性能研究进展

发布时间：2018-04-03 17:26

本文选题：冻融破坏　切入点：再生混凝土　出处：《混凝土》2017年04期

【摘要】：冻融破坏是指含水或与水接触的混凝土在长期正负温度交替循环作用下在表面产生拉裂缝,诱导内部裂缝开展最终使混凝土性能全面劣化的剥蚀破坏。我国幅员辽阔,三北地区大部分建筑物及西南高山高原地区的重要工程都受到冻融破坏的影响,给建设工作带来巨大挑战。冻融破坏已成为上述地区结构服役期间最主要的不利因素,产生巨大的安全隐患和经济损失。结合国内外冻融破坏研究现状,介绍混凝土、再生混凝土、纤维增强混凝土及纤维增强再生混凝土在冻融循环条件下的力学性能、宏观表现及微观破坏机理。通过对比探讨提高混凝土及再生混凝土抗冻耐久性的方法,对新型混凝土尤其是纤维增强再生混凝土应用于未来建设活动的必要性和可行性做出展望。
[Abstract]:Freeze-thaw failure refers to concrete with water or contact with water produces tensile cracks on the surface under the action of long term positive and negative temperature alternating cycle, which induces internal cracks to carry out the denudation and destruction of concrete properties in an all-round way.Our country has a vast territory, most of the buildings in the three northern regions and the important projects in the southwest alpine plateau area are affected by the freezing and thawing damage, which brings great challenges to the construction work.Freezing and thawing damage has become the most important unfavorable factor during the period of structure service in these areas, which has caused huge safety hidden trouble and economic loss.Combined with the research status of freeze-thaw failure at home and abroad, this paper introduces the mechanical properties, macroscopic behavior and microscopic failure mechanism of concrete, recycled concrete, fiber reinforced concrete and fiber reinforced recycled concrete under freeze-thaw cycle.By comparing the methods to improve the frost durability of concrete and recycled concrete, the necessity and feasibility of the application of new type concrete, especially fiber reinforced recycled concrete, in future construction activities are prospected.
【作者单位】：四川大学建筑与环境学院;
【基金】：四川大学-大学生创新创业训练计划(1030504138012) 国家自然科学基金(51408382)
【分类号】：TU528.01

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