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首页> 外文会议>第二届自密实混凝土设计、性能及应用技术国际研讨会(2nd International Symposium on Design,Performance and Use of Self-Consolidating Concrete SCC'2009-China) >EFFECT OF FREEZING-THAWING CYCLES ON THE PHYSICAL AND MECHANICAL CHARACTERISTICS OF CONCRETE
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EFFECT OF FREEZING-THAWING CYCLES ON THE PHYSICAL AND MECHANICAL CHARACTERISTICS OF CONCRETE

机译：冻融循环对混凝土物理力学特性的影响

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摘要

Concrete is the most used construction material in practically all of civil engineering fields due to its economical and technical advantages. However, its microstructure is porous and may be complctcly or partially water saturated. In severely cold climates, this water freezes and degradations develop gradually with the freezing-thawing cycle's number, in forms of internal cracking, chipping and scaling.Frost behaviour is based on the coupling between the 9% volumetric increase during water transformation into ice, the cryo-suction phenomena, the non frozen water transport within the porous network and the thermo-mechanical behaviour of each component of the frozen media. It is thus obvious that the frost resistance depends on the microstructure (pore size distribution and permeability) and the mechanical characteristics of the material.In this paper, physical and mechanical characteristics evolution during freezing-thawing cycles was followed. The results show that the reduction in the mechanical resistance and the elastic modulus is accompanied with an increase in the intrinsic permeability. The damage can be characterized by a scalar parameter, Df, due to frost action.With this parameter, the resistance reduction as well as the permeability evolution may be described, with a good agreement, as a function of cracks development.
机译：由于其经济和技术优势，混凝土是几乎所有土木工程领域中最常用的建筑材料。然而，其微结构是多孔的，并且可能是完全或部分水饱和的。在严寒的气候下，水的冻结和解冻随着冻结融化循环次数的增加而逐渐发展，以内部开裂，碎裂和结垢的形式出现。结冰行为基于水转化为冰的9％体积增加之间的耦合，冷冻抽吸现象，多孔网络内未冷冻的水传输以及冷冻介质的每个成分的热机械行为。因此，很明显，其抗冻性取决于材料的微观结构（孔径分布和渗透性）以及机械特性。本文研究了冻融循环过程中的物理和机械特性演变。结果表明，机械阻力和弹性模量的降低伴随着固有磁导率的增加。霜冻作用可以用标量参数Df来表征损伤。使用此参数，可以描述电阻降低以及渗透率的变化，并与裂纹的发展有很好的一致性。

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