United States Department of Transportation
i
Repairing Concrete Structures Using Near-Surface Mounted Composites With Inorganic Resins Under Simulated Multi-Hazard Damage
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2022-12-01
[PDF-2.71 MB]
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Edition:Final Report
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Abstract: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, polyestersilica, 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 polyestersilica outperform the beams with other resins; however, UHPC enables stable degradation over the years.
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