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Title: Investigation of the Microstructure and Mechanical Properties of the Structural Materials of the I-880 Double-Deck Viaduct

Author(s): Paulo J. M. Monteiro, Jon G. Asselanis, and William G. Maccracken

Publication: Materials Journal

Volume: 88

Issue: 3

Appears on pages(s): 288-293

Keywords: concretes; earthquakes; mechanical properties; microstructure; petrography; reinforcing steels; viaducts; Materials Research

DOI: 10.14359/1914

Date: 5/1/1991

Abstract:
Paper reports on the microstructure and mechanical properties of the reinforced concrete from the I-880 double-deck viaduct that collapsed due to the October 17, 1989 San Francisco Bay area earthquake. Thin sections were prepared for petrographic examination, and flat polished surfaces were made for backscattered electron imaging. Cores of concrete were taken for determination of elastic modulus, Poisson's ratio, compressive and tensile strengths, and chloride permeability. Samples of the nonreinforcing bars were also taken to evaluate their stress-strain diagram, which was modeled by a Menegotto-Pinto expression. The results indicate that the materials had adequate mechanical strength and, at least for the three columns studied, the concrete was properly placed and cast.


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