Bending Behavior of Concrete Sections With Thin Cement Composite Overlay For Pavement Application

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Title: Bending Behavior of Concrete Sections With Thin Cement Composite Overlay For Pavement Application

Author(s): P. Paramasivam, T. F. Fwa, and C. M. Lau

Publication: Special Publication

Volume: 146

Issue:

Appears on pages(s): 91-110

Keywords: bending; composite materials; crack width and spacing; ferrocement; flexural strength; load-deflection curves; mortars (material); pavements; resurfacing; Structural Research

Date: 6/1/1994

Abstract:
An analytical and experimental investigation is carried out to study the flexural behavior of concrete pavements rehabilitated with different types of overlays such as plain mortar, steel fiber mortar, and ferrocement. Explicit expressions are derived for the load-deflection characteristics based on the basic properties of constituent materials. Analytically predicted load-deflection curves are found to agree well with the experimental data. Flexural toughness indexes are also computed from the load-deflection curves. The results indicate that steel fiber mortar and ferrocement overlays show better post-cracking rigidity, a higher toughness index, and smaller crack widths compared to overlays of plain mortar or the original full-depth concrete section. They also indicate that, with a properly bonded overlay, the flexural strength of the original pavement can be achieved without distress at the interface.