Creep of Prestressed Self-Consolidating Concrete

This paper will discuss how time-dependent deformations caused by creep lead to the loss of prestressing force and changes in camber in the design of structural members. An experimental program was performed to evaluate the creep of prestressed self-consolidating concrete (SCC). A total of 16 SCC mixtures with a slump flow of 680 ± 20 mm (26.7 ± 0.8 in.) were prepared with various parameters, including the binder content and binder type, water-cementitious material ratio (w/cm), dosage of viscosity modifying admixture, and sand-to-total aggregate ratio (S/A). Two high-performance concrete (HPC) mixtures with 0.34 and 0.38 w/cm and a slump consistency of 150 mm (5.9 in.) were investigated for the control mixtures. The findings indicated that the evaluated SCC developed up to 20% higher creep than HPC of similar w/cm. The creep values of SCC were compared to the prediction models proposed by AASHTO 2004 and 2007, CEBFIP MC90, GL 2000, and ACI 209R-92. The CEB-FIP MC90 and modified AASHTO 2007 models are found to provide an adequate prediction of creep for prestressed SCC.

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Availability:
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Authors:
- Long, Wu Jian
- Khayat, Kamal Henri
Publication Date: 2011

Language

English

Media Info

Media Type: Print
Features: Figures; Photos; References; Tables;
Pagination: pp 476-484
Serial:
- ACI Materials Journal
- Volume: 108
- Issue Number: 5
- Publisher: American Concrete Institute (ACI)
- ISSN: 0889-325X
- Serial URL: https://www.concrete.org/publications/acimaterialsjournal.aspx

Subject/Index Terms

TRT Terms: Admixtures; Binder content; Creep; Curvature; High performance concrete; Prestressed concrete; Self compacting concrete; Structural members; Time dependence; Water cement ratio
Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

Accession Number: 01353940
Record Type: Publication
Files: TRIS
Created Date: Oct 17 2011 3:39PM