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Chloride Penetration and Freeze-Thaw Attack



Author(s):
Paper category: Bibliography
Book title: Publications on Durability of Reinforced Concrete Structures under Combined Mechanical Loads and Environmental Actions: An Annotated Bibliography
Editor(s): Yao Yan, Wang Ling, Wittmann Folker
Print ISBN: 978-3-942052-03-0
Publisher: Aedificatio Publishers
Pages: 35 - 41
Total Pages: 7
Language: English


Abstract: 
As a major durability issues for cementitious materials in cold regions, Freeze-thaw action has been intensively studied for over 70 years. A number of models have been proposed to clarify the deterioration mechanism both at micro-level and macro-level, among which the hydraulic pressure and crystallization pressure have been recognized as the two main pressure sources for freeze-thaw damage. Micro-cracks are thus initiated and propagated in pore wall due to the tremendous freezing pressure. The emergence of microcracks provides a perfect path for moisture, aggressive species, and gases to access the interior of concrete matrix, and the propensity for a high degree of saturation.

De-icing salts and sea water are two common compounds which contain considerable amounts of chloride ions. The former is usually used to de-ice concrete roadways and walkways in snowstorm weather, while the latter is found commonly in coastal regions. With the presence of chloride ions, the combination of freeze-thaw actions and chloride penetration not only renders the salt scaling but also results in the decrease of service life due to the corrosion of reinforcing steel. With regard to the salt scaling, intensive research efforts had been performed by RILEM TC-117-FDC and RILEM TC 176-IDC, and a large number of papers had been reviewed on this subject. In this chapter, considered entries have been selected to better understand the effects of combined of chloride penetration and freeze-thaw attack on the service performance of concrete.


Online publication: 2014
Publication Type: full_text
Public price (Euros): 0.00