Effect of polymer modified cementitious coatings on chloride-induced corrosion of steel in concrete

被引：16

作者：

Brenna, Andrea ^{[1
]}

Beretta, Silvia ^{[1
]}

Berra, Mario ^{[2
]}

Diamanti, Maria Vittoria ^{[1
]}

Ormellese, Marco ^{[1
]}

Pastore, Tommaso ^{[3
]}

Pedeferri, MariaPia ^{[1
]}

Bolzoni, Fabio ^{[1
]}

机构：

[1] Politecn Milan, Dipartimento Chim Mat & Ingn Chim Giulio Natta, Via Mancinelli 7, I-20131 Milan, Italy

[2] RSE SpA Ric Sistema Energet, Milan, Italy

[3] Univ Bergamo, Dipartimento Ingn & Sci Appl, Dalmine, BG, Italy

来源：

STRUCTURAL CONCRETE | 2020年 / 21卷 / 05期

关键词：

chlorides diffusion; concrete coatings; corrosion of reinforcements; REINFORCED-CONCRETE; DURABILITY DESIGN; SURFACE-TREATMENT; PERFORMANCE; PENETRATION; INHIBITORS; MORTAR; PROTECTION; PARAMETERS; MODEL;

D O I：

10.1002/suco.201900255

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The paper deals with the study of the effect of polymer modified cementitious mortars on chloride-induced corrosion of steel reinforcement in concrete. Nowadays, many results obtained by standard and short-term tests are available in the literature. The paper reports more than 15 years exposure testing on two commercial coatings, with different polymer/cement ratio. The effect of coatings on corrosion initiation and propagation has been studied by the monitoring of corrosion potential and corrosion rate of rebars in concrete subjected to chloride ponding; chloride profiles, coating adhesion, water content, and corrosion morphology have been also analyzed. It was demonstrated that polymer modified cementitious mortars can delay corrosion initiation caused by chloride penetration into concrete. Owing to high resistivity of coated concrete, corrosion rate is reduced. The protective effect is more pronounced as the polymer content increases from 0.35 to 0.55. The results have been elaborated to estimate the possible increase of service life gained with this additional protection method, compared with other solutions.

引用

页码：1810 / 1822

页数：13

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