Carbonation rate in old structures assessed with air-permeability site NDT

Kei Ichi Imamoto, Rui Neves, Roberto Torrent

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Citations (Scopus)

Abstract

In this paper, test results obtained on several old concrete structures (up to 60 years old), located in different regions of Japan, Portugal and Switzerland, arc presented. First, the coefficient of air-pcrmcability kT (Swiss Standard SIA 262/1) was measured at different locations of those structures, to be followed by the measurement of the carbonation depth CD on samples removed from the same locations. The CD values were "normalized" by converting them into carbonation rates CR (CR = CD/√Jage). The results highlight the following facts: There is a large scatter in both kT and CD within each structure, posing a challenge for prediction modeling There is a general trend of higher values of CR for higher values of kT If kT is low, CR is also low; however, there arc some cases of high kT and low CR (possibly due to micro- climatic exposure conditions and/or presence of cracks) There seems to be a threshold value of kT (~0.0l 10-16 m2) below which the carbonation rate is negligible (less than 1 mm/√a, i.e. less than 10 mm in 100 years) The results presented are useful lo predict the carbonation rate on Ihe basis of non-deslruclive air-permeability measurements made on site, as has been done in some real cases.

Original languageEnglish
Title of host publicationMaintenance, Monitoring, Safety, Risk and Resilience of Bridges and Bridge Networks - Proceedings of the 8th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2016
EditorsAndre T. Beck, Dan M. Frangopol, Tulio Nogueira Bittencourt
PublisherCRC Press/Balkema
Pages178-184
Number of pages7
ISBN (Print)9781138028517
Publication statusPublished - 1 Jan 2016
Event8th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2016 - Foz do Iguaçu, Brazil
Duration: 26 Jun 201630 Jun 2016

Publication series

NameMaintenance, Monitoring, Safety, Risk and Resilience of Bridges and Bridge Networks - Proceedings of the 8th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2016

Conference

Conference8th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2016
Country/TerritoryBrazil
CityFoz do Iguaçu
Period26/06/1630/06/16

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