Paper Title:
Mathematical Modeling of the Pessimum Action of Chlorides on the Extent of Delayed Ettringite Formation. Part 1: Formulation
  Abstract

Internal sulfate ions are the main cause of delayed ettringite formation, which leads to expansive damage of cement concretes. On the other hand, the exposure of cementitious systems to chloride ions causes corrosion of reinforcement bars that finally seriously shortens the service life of reinforced concrete structures. It has been found that, when concomitantly present in cementitious systems, chlorides interact with sulfate ions. Particularly, for a given concentration of sulfate ions present, low to moderate concentrations of chloride ions bring about serious deterioration of concretes due to high amount of ettringite formed, while higher contents of chlorides tend to reduce and even completely eliminate ettringite formation. The objective of the present project is to mathematically formulate the interaction between chloride and sulfate ions in cementitious materials. Such knowledge is useful for accurate consideration of the action of chlorides on concretes used in sea environments, thus predicting more precisely their service life (this being a far important step in design).

  Info
Periodical
Key Engineering Materials (Volumes 400-402)
Edited by
Jingsi Huo, Yan Xiao, Zongjin Li and Shuaib Ahmad
Pages
203-208
DOI
10.4028/www.scientific.net/KEM.400-402.203
Citation
P. L. Mulongo, S. Ekolu, "Mathematical Modeling of the Pessimum Action of Chlorides on the Extent of Delayed Ettringite Formation. Part 1: Formulation", Key Engineering Materials, Vols. 400-402, pp. 203-208, 2009
Online since
October 2008
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Price
$32.00
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Chapter 5: Physicochemical Bases of Building Materials
Abstract:The long term behaviour of limestone cement concrete, stored in combined chloride and sulfate environment, was studied, taking into...
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