Abstract
Frost damage is typical material deterioration in concrete structures subjected to external environmental conditions. However, the weather conditions do not make the sufficient factor causing the worsening of the concrete properties. Concrete structures with frost damage in service are subjected to loadings. The investigation was carried out with the primary objective to assess the influence of interaction of mechanical load and freeze-thaw cycles on damage process of concrete. The salt scaling process was observed for beam specimens subjected to cyclic freezing and thawing in third-point loading condition. The damage development due to internal cracking was monitored using fracture mechanics parameters.DOI: http://dx.doi.org/10.5755/j01.sace.1.1.2616
Highlights
Under severe freezing climate conditions, frost action is probably the most important cause of deterioration of exposed concrete structures
It has been found that the deterioration of concrete could be accelerated when subjected to multidamaging processes, e. g. simultaneously exposed to external load, freeze-thaw cycles and chloride or sulphate attack
There are very few test results considering the effects of interaction of mechanical loading and cyclic freezing and thawing, and in large part, they concern the effect of internal damage on concrete properties (Zhou et al 1994, Sun et al 1999, Yu et al 2008)
Summary
Under severe freezing climate conditions, frost action is probably the most important cause of deterioration of exposed concrete structures. There are very few test results considering the effects of interaction of mechanical loading and cyclic freezing and thawing, and in large part, they concern the effect of internal damage on concrete properties (Zhou et al 1994, Sun et al 1999, Yu et al 2008). Icing salt solution was kept on the top of specimen thanks to Freeze-thaw cycles and loads are both repetitive actions the rubber sheet glued to all surfaces of the specimen except that cause accumulated physical damages in concrete. Before the influence of material damage to mechanical properties, the specimens were placed in the freezing chamber, the the evolutive process and rules of materials or structure demineralized water was replaced with 3% NaCl solution. The methods of fracture mechanics were approved in structural design by the latest proposal of CEB-FIP Model Code (2010)
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