EFFECT OF AGGREGATE POROSITY ON CHLORIDE INGRESS INTO CONCRETE

2003 ◽  
pp. 287-297 ◽  
Author(s):  
W F Price ◽  
M R Jones ◽  
S C Ting ◽  
R K Dhir
Keyword(s):  
Chloride Ingress

Estimation of the Amount of Chloride Ingress in Concrete Taking Into Account Differences in the Amount of Adhering Salt on Bridge Members

2016 ◽  
Vol 54 (2) ◽  
pp. 164-169
Author(s):  
A. Kamiharako ◽  
J. Tomiyama ◽  
K. Arai ◽  
T. Habuchi
Keyword(s):  
Chloride Ingress

scholarly journals Model uncertainty in diffusion coefficient for chloride ingress into concrete

2021 ◽  
Vol 31 ◽  
pp. 147-153
Author(s):  
Petr Konečný ◽  
Marie Horňáková ◽  
Petr Lehner ◽  
Pavla Rovnaníková ◽  
Miroslav Sýkora
Keyword(s):  
Diffusion Coefficient ◽  
Model Uncertainty ◽  
Chloride Ingress

Residual service life estimation of bridges

2021 ◽  
Author(s):  
Mayank Bajaj ◽  
Biswajit Bhattacharjee
Keyword(s):  
Residual Life ◽  
Concrete Bridges ◽  
Life Assessment ◽  
Residual Service Life ◽  
Chloride Ingress ◽  
Service Life Estimation ◽  
Residual Life Assessment ◽  
Existing Bridges ◽  
Residual Service

<p>While concrete structures perform well in many situations, lack of durability has emerged as a significant issue for asset owners. A review of past bridge failures was done to identify the most probable causes of bridge failures. This study has tended to focus on current models used for estimating the time to deterioration of concrete bridges instigated by Chloride ingress and Fatigue. Subsequently, mathematical modelling of the best-suited deterioration model is done to arrive at the residual life of two existing bridges. This work has highlighted high variability in the parameters used to describe the durability related properties of in-situ aged concrete. A realistic residual life assessment can be achieved by correct evaluation of these parameters by periodic testing of bridge samples</p>

scholarly journals Leaching, carbonation and chloride ingress in reinforced alkali-activated fly ash mortars

2018 ◽  
Vol 199 ◽  
pp. 02025 ◽  
Author(s):  
Gregor J. G. Gluth ◽  
Petr Hlaváček ◽  
Steffi Reinemann ◽  
Gino Ebell ◽  
Jürgen Mietz
Keyword(s):  
Fly Ash ◽  
Visual Inspection ◽  
Electrochemical Behaviour ◽  
Transport Coefficients ◽  
Chloride Penetration ◽  
Chloride Ingress ◽  
Reaction Products ◽  
Steel Bars ◽  
Alkali Activated Binders ◽  
Alkali Activated

Alkali-activated fly ash mortars were studied with regard to durability-relevant transport coefficients and the electrochemical behaviour of embedded carbon steel bars on exposure of the mortars to leaching, carbonation and chloride penetration environments. The transport coefficients differed considerably between different formulations, being lowest for a mortar with BFS addition, but still acceptable for one of the purely fly ash-based mortars. Leaching over a period of ~300 days in de-ionized water did not lead to observable corrosion of the embedded steel, as shown by the electrochemical data and visual inspection of the steel. Exposure to 100 % CO2 atmosphere caused steel depassivation within approx. two weeks; in addition, indications of a deterioration of the mortar were observed. The results are discussed in the context of the different reaction products expected in highand low-Ca alkali-activated binders, and the alterations caused by leaching and carbonation.

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