Monitoring Corrosion and Determining of the Gravimetric Corrosion Rate of Concretes with High and Low Reactivity Additions Subject to Chloride Action

Title: Monitoring Corrosion and Determining of the Gravimetric Corrosion Rate of Concretes with High and Low Reactivity Additions Subject to Chloride Action
Author(s): Ferreira
Paper category : conference
Book title: International RILEM Conference on the Use of Recycled Materials in Building and Structures
Editor(s): E. Vázquez, Ch. F. Hendriks and G.M.T. Janssen
Print-ISBN: 2-912143-52-7
e-ISBN: 2912143756
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 963 - 972
Total Pages: 10
Nb references: 15
Language: English

Abstract: This paper presents the results of an experimental study conducted at the Civil Engineering
Technology Center of FURNAS (Goiânia, Brazil), and is the object of a Master’s degree
dissertation [1] developed at the Master’s Program in Civil Engineering of the Federal
University of Goiás. The study aimed to evaluate the capacity of concretes with mineral
additions to protect reinforcements against chloride-induced corrosion. To this end, concretes
were cast containing additions of silica fume (10%), metakaolin (10%), rice husk ash (10%),
fly ash (25%) and blast furnace slag (65%) in partial substitution for the cement mass, in
addition to the reference concrete (without addition), with variations in the water/binder ratio
(0.40, 0.55 and 0.70) and in the curing procedure (air and wet curing). The main results
included the different behavior displayed by the additions of high and low reactivity in the
properties that were evaluated; worthy of note also were the increase in the concrete’s
electrical resistivity in up to four times, the development of less electronegative half-cell
potential, a considerable increase in reinforcement depassivation time as well as an expressive
reduction in corrosion rates (50%) which some additions displayed with respect to the
reference concrete.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.106