Service life evaluation of RC T-girder under carbonation considering cold joint and loading effects

Tae Ho Koh, Moon Kyum Kim, Keun Hyeok Yang, Yong Sik Yoon, Seung Jun Kwon

Research output: Contribution to journalArticle

Abstract

Carbon dioxide concentration is steadily increasing in large cities. Consequently, durability evaluation of RC (Reinforced Concrete) structures considering carbonation is becoming a serious issue. Construction joints are used for the effective construction of concrete structures. However, cold joints which are caused by delayed placing and poor surface treatment are vulnerable to shear force and the inflow of carbon dioxide. In this study, an accelerated carbonation test was performed for normal-strength concrete using NPC (Normal Portland Cement) and slag after applying tensile and compressive stresses. The carbonation characteristics were quantified considering the effects of cold joint and the induced stress, and structural analysis was performed using the section laminae approach for a 2-span continuous reinforced concrete T-beam bridge. The service life of top and bottom concretes was evaluated considering the calculated stress, existing carbonation velocity equation, and carbonation function according to the stress. The service life showed a similar trend to that of the applied moment. Changes of 103.6%–64.7% (NPC) and 78.0%–108.8% (slag) were observed on the top surface, whereas changes of 103.8%–65.9% (NPC) and 112.9%–79.6% (slag) were observed on the bottom surface. The service life significantly decreased owing to the increasing carbonation depth for the cold joint in the tension part. This suggests that special care should be taken for cold joints during maintenance.

Original languageEnglish
Pages (from-to)106-116
Number of pages11
JournalConstruction and Building Materials
Volume226
DOIs
Publication statusPublished - 2019 Nov 30

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Carbonation
Service life
Reinforced concrete
Portland cement
Slags
Concrete construction
Carbon Dioxide
Carbon dioxide
Concretes
Stress analysis
Compressive stress
Structural analysis
Tensile stress
Surface treatment
Durability

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Cite this

Koh, Tae Ho ; Kim, Moon Kyum ; Yang, Keun Hyeok ; Yoon, Yong Sik ; Kwon, Seung Jun. / Service life evaluation of RC T-girder under carbonation considering cold joint and loading effects. In: Construction and Building Materials. 2019 ; Vol. 226. pp. 106-116.
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Service life evaluation of RC T-girder under carbonation considering cold joint and loading effects. / Koh, Tae Ho; Kim, Moon Kyum; Yang, Keun Hyeok; Yoon, Yong Sik; Kwon, Seung Jun.

In: Construction and Building Materials, Vol. 226, 30.11.2019, p. 106-116.

Research output: Contribution to journalArticle

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