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Lifetime modelling of chloride-induced corrosion in concrete structures with Portland and blended cements

Faustino, P, Chastre, C, Nunes, Â and Brás, A (2016) Lifetime modelling of chloride-induced corrosion in concrete structures with Portland and blended cements. Structure and Infrastructure Engineering, 12 (9). pp. 1013-1023. ISSN 1573-2479

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This article discusses mathematical modelling of the long-term performance of concrete with different supplementary cementitious materials in a maritime environment. The research was carried out in the light of the national Portuguese application of the CEN standards with mandatory requirements for a performance-based design approach. Laboratory investigations were performed on concrete compositions based on CEM I and CEM II/B-L in which the cement was partially replaced by either 0% (reference composition) or 50% of low calcium fly ash (FA). Concrete compositions were made with the objective to achieve service lives of 50 and 100 years with regard to steel corrosion. Test results of compressive strength, chloride potential diffusion and electrical resistivity are reported for different curing ages of 28, 90, 180 and 365 days. Chloride diffusion results were used for the implementation of modelling equations in order to estimate the design lifetime regarding reinforcing steel corrosion. A performance-based approach using a probabilistic method was carried out and the results obtained are compared with the requirements according to the Portuguese prescriptive approach. The modelling results show that FA blended compositions have better performance compared to those with Portland cements, especially if curing ages beyond 28 days are considered.

Item Type: Article
Uncontrolled Keywords: 0905 Civil Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TH Building construction
Divisions: Civil Engineering & Built Environment
Publisher: Taylor & Francis
Date Deposited: 25 Oct 2019 11:19
Last Modified: 04 Sep 2021 08:36
DOI or ID number: 10.1080/15732479.2015.1076487
URI: https://researchonline.ljmu.ac.uk/id/eprint/11640
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