Composite Repair for Concrete Bridges Subjected to Alkali-Silica Reaction

This report presents a comparative experimental study on the axial behavior of concrete subjected to alkali-silica reaction (ASR) with and without confinement by carbon-fiber reinforced polymer (CFRP) sheets. A total of 120 cylinders are cast using two types of coarse aggregates to represent variable levels of ASR: rhyolite (reactive) substitutes granite (non-reactive) at a replacement ratio ranging from 0% to 100%. As per a test standard, the cylinders are conditioned in a sodium hydroxide (NaOH) solution. The physical properties of the concrete and the solution are measured over time to examine the reciprocal action between the NaOH and rhyolite, followed by microscopic observations on the progression of ASR through the concrete. Sixty cylinders are confined and all specimens are monotonically loaded to failure. The load-carrying capacity of the confined cylinders noticeably increases compared with that of the plain concrete, while the degree of improvement is controlled by the ASR-damaged concrete core. The average toughness of the cylinders decays with ASR, accompanied by irreversible energy dissipation and degraded CFRP-concrete interaction. The failure characteristics of both plain and confined cylinders are also influenced by ASR, dependent upon the replacement ratio, particularly for the integrity of the core. An analytical model is formulated to understand the implications of ASR, including an assessment of an existing design approach, and is further used for design recommendations.

• Record URL:
  https://www.ugpti.org/resources/reports/details.php?id=1068
• Supplemental Notes:
  • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
• Corporate Authors:

  University of Colorado, Denver

  Department of Civil Engineering
  1201 5th Street, Room AD240C, P.O. Box 173364
  Denver, CO  United States  80217-3364

  Mountain-Plains Consortium

  North Dakota State University
  Fargo, ND  United States  58108

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Authors:
  • Kim, Y J
• Publication Date: 2022-3

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Figures; Photos; References; Tables;
• Pagination: 29p

Subject/Index Terms

• TRT Terms: Alkali silica reactions; Composite materials; Concrete bridges; Failure analysis; Fiber reinforced polymers
• Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation; Materials;

Filing Info

• Accession Number: 01848431
• Record Type: Publication
• Report/Paper Numbers: MPC-583, MPC 22-455
• Files: UTC, TRIS, ATRI, USDOT
• Created Date: Jun 13 2022 1:10PM