Internal curing of high performance concrete bridge decks and its effects on performance, service life, and life-cycle cost

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Conference50th Brazilian Concrete Congress 'Concrete Infrastructure and Environmental Conservation': 04 September 2008, Salvador, Brazil
Pages120; # of pages: 20
Subjectinternal curing; high performance concrete; bridge deck; service life; High performance / High strength concrete
AbstractHigh performance concrete (HPC) bridge decks are prone to premature cracking if movement is restrained. Internal curing (IC) can reduce shrinkage cracking in structures, thus improving their performance and service life. However, there is very limited information in the literature on the possible extension of service life due to internal curing. This paper addresses this question by using predictive models to estimate the service life and life-cycle costs of a typical bridge deck made with concrete using internal curing as opposed to conventional curing. Four options are compared: (i) normal concrete deck; (ii) HPC deck; (iii) HPC deck with internal curing; and (iv) very high performance concrete deck with internal curing. It was found that the use of internal curing can extend the service life of HPC bridge decks by almost ten years, which is mainly due to due a slower penetration of chlorides as a result of reduced shrinkage cracking. The use of internal curing in HPC decks resulted in a 20% reduction in life-cycle costs, even though the in-place unit cost of internally-cured HPC can be up to 4% higher than that of conventionally-cured HPC. The higher initial investment for the construction of the HPC-IC deck can be offset in only 5 years when compared to that required for normal concrete deck. This is due to a longer service life and less frequent maintenance activities.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number50538
NPARC number20377335
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Record identifierc27a946d-02d4-4f1d-b9cf-ee846181f9c2
Record created2012-07-24
Record modified2016-05-09
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