Abstract
This paper focuses on recent research conducted at the University of Minnesota on applications of high-strength concrete to prestressed bridge girders. The research comprised production of high-strength concrete with a variety of cementitious materials (Portland cement, microsilica and fly ash) in different proportions, and made with six different types of coarse aggregate. Some specimens were moist-cured in saturated limewater at 73°F (23°C); others were heat-cured in an environmental chamber at 120° or 150°F (50° or 65°C) to simulate the accelerated curing technique used by precast/prestressed plants. The hardened concrete specimens were tested for compressive strength, modulus of elasticity, tensile strength, modulus of rupture, shrinkage, creep, absorption potential (as an indicator of permeability) and freeze-thaw durability. In addition, a parametric study was conducted to determine the viability of using high-strength concrete in prestressed bridge girders. Two long span prestressed bridge girders have been constructed to investigate transfer lengths, prestress losses, fatigue performance, shear and ultimate strength of girders cast with high-strength concrete.
Original language | English (US) |
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Pages (from-to) | 105-113 |
Number of pages | 9 |
Journal | Construction and Building Materials |
Volume | 2-3 |
Issue number | 2-4 |
DOIs | |
State | Published - Mar 1 1998 |
Bibliographical note
Funding Information:This research investigation has been conducted under the joint sponsorship of the Minnesota Prestress Association, Minnesota Department of Transportation, University of Minnesota — Center for Transportation Studies and National Science Foundation Grant No. BCS-8451536. The authors also wish to acknowledge the generous donations of materials and equipment by Lehigh Cement Company, Holnam, Inc., National Minerals Corporation, J.L. Shiely Company, Edward Kraemer & Sons, Inc., Meridian Aggregates, W.R. Grace & Co., Cormix and Elk River Concrete Products. The views expressed herein are those of the authors and do not necessarily reflect the views of the sponsors.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
Keywords
- High-strength concrete
- Microsilica
- Portland cement