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.