Repairing Concrete Structures Using Near-Surface Mounted Composites with Inorganic Resins under Simulated Multi-hazard Damage

The first part of the study presents the time-dependent interfacial behavior of near-surface-mounted (NSM) carbon fiber reinforced polymer (CFRP) strips bonded to a concrete substrate using inorganic resins. Four types of bonding agents (mortar, polyester-silica, ultra-high performance concrete (UHPC), and geopolymer) are tested to appraise the potential for NSM application with a focus on rheological and mechanical performance during a curing period of 28 days. The second part of the study discusses the feasibility and relevance of cementitious resins as a bonding agent for NSM CFRP strips. Contrary to conventional organic matrices, such inorganic resins offer promising performance when subjected to aggressive environments, especially under thermal distress. Three emerging resins are employed (polyester-silica, UHPC, and geopolymer) to strengthen reinforced concrete beams alongside NSM CFRP. After stochastically simulating various levels of pitting corrosion for a period of 100 years, the outcomes are represented in the beams by reducing the cross-sectional area of steel reinforcement before applying the rehabilitation system. The emphasis of experimental investigations lies on the workability of those resins and the flexural response of the retrofitted beams. Material-level testing reveals that the rheological properties of the resins are not related to their compressive strength. As far as load-carrying capacity is concerned, the beams bonded with polyester-silica outperform the beams with other resins; however, UHPC enables stable degradation over the years.

• Record URL:
  https://www.ugpti.org/resources/reports/details.php?id=1111
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/66113
• 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
  1200 Larimer Street, 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, Yail Jimmy
• Publication Date: 2022-12

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Figures; Photos; References; Tables;
• Pagination: 69p

Subject/Index Terms

• TRT Terms: Bonding; Composite materials; Compressive strength; Concrete structures; Fiber reinforced polymers; Repairing; Resins
• Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation; Materials;

Filing Info

• Accession Number: 01870539
• Record Type: Publication
• Report/Paper Numbers: MPC 22-490
• Contract Numbers: MPC-648
• Files: UTC, NTL, TRIS, ATRI, USDOT
• Created Date: Jan 24 2023 9:27AM