Evaluation of concrete structures duralibility under risk of carbonation
PBN-AR
Instytucja
Wydział Inżynierii Lądowej (Politechnika Warszawska)
Książka
Tytuł książki
Concrete Repair, Rehabilitation and Retrofitting IV.+ CD
Data publikacji
2016
ISBN
978-1-138-02843-2
Wydawca
Taylor & Francis Group
Publikacja
Główny język publikacji
en
Tytuł rozdziału
Evaluation of concrete structures duralibility under risk of carbonation
Rok publikacji
2016
Strony (od-do)
205-205
Numer rozdziału
Identyfikator DOI
Liczba arkuszy
0.3
Hasło encyklopedyczne
Autorzy
Streszczenia
Język
en
Treść
Authors The mechanism of reinforced concrete structures degradation under the risk of carbonation and chloride corrosion and its relation to the life cycle of the structure are shown. The models of carbonation progress and chloride migration in concrete are analyzed. Preferences of hyperbolic model of carbonation and the special role of its asymptote as the limit defining the depth of carbonation have been shown. Conditions for the initiation of corrosion in concrete elements with particular attention to the critical chloride concentration are defined. Various methods of determining the distribution profile of chlorides in concrete with particular emphasis on the diffusion coefficient of chloride are discussed. Four possible procedures of determining apparent diffusion coefficient are shown. The first is a computational method based on theoretical equation of chloride distribution in concrete space between surface and maximal depth of measurements. The second one is based on the determination of chloride distribution model using “best fitting curve” method. The third one is estimative—graphical way of determining of diffusion coefficient and the fourth is the calculation of the expression erfc(b) from the equation of diffusion, on the basis of experimentally measured values of chloride concentration, and then, by using the tabularized values of erfc—determining the value of its argument (in parenthesis) and finally the value D0. Examples of using this procedures and threat of possible errors and mistakes are shown also. On this basis an algorithm for predicting the durability of concrete structures under conditions of potential corrosion has been elaborated. The examples of the use of this algorithm are shown.
Inne
System-identifier
WUT15afd0fea8624fcfb482d514a13859be