Creep and shrinkage behavior of high-strength concrete and minimum reinforcement ratio for bridge columns
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Date
2010
Authors
Mertol, Halit Cenan
Mertol,H.C.
Rizkalla,S.
Zia,P.
Mirmiran,A.
Journal Title
Journal ISSN
Volume Title
Publisher
Precast/Prestressed Concrete Institute
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Abstract
This paper summarizes the findings of an extensive research program that examined the shrinkage and creep behavior of high-strength concrete (HSC) up to a strength of 18 ksi (124 MPa). Creep and shrinkage strains of 60 specimens were monitored for up to two years. The variables considered in this investigation were the concrete compressive strength, specimen size, curing type, age of concrete at loading, and loading stress level. Research findings indicate that the current American Association of State Highway and Transportation Officials' AASHTO LRFD Bridge Design Specifications could be used to estimate the creep coefficient and shrinkage strain of HSC up to 15 ksi (103 MPa). However, the current AASHTO LRFD specifications do not provide appropriate predictions for concrete compressive strength greater than 15 ksi (103 MPa). A revised time-development correction factor is proposed to obtain better predictions for HSC up to 18 ksi (124 MPa). For HSC compression members, the current AASHTO LRFD specifications require an excessive amount of minimum longitudinal reinforcement to account for the long-term effects due to shrinkage and creep. Based on an analysis, a new relationship is proposed for the required minimum reinforcement ratio.
Description
Keywords
Column, Creep, High-strength concrete, Longitudinal reinforcement ratio, Shrinkage
Turkish CoHE Thesis Center URL
Fields of Science
Citation
18
WoS Q
Q4
Scopus Q
N/A
Source
PCI Journal
Volume
55
Issue
3
Start Page
138
End Page
154