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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 985 Abstracts search results
Document:
CI4704NexInsights
Date:
April 1, 2025
Publication:
Concrete International
Volume:
47
Issue:
4
Abstract:
There is a lack of comprehensive guidelines for the use of fiber-reinforced polymer (FRP) dowels in concrete pavement construction. In light of this, NEx: An ACI Center of Excellence for Nonmetallic Building Materials has announced a newly published document SG23.03 (25): NEx Guideline: FRP Dowels in Concrete Pavements.
CI4704Ehsani
Author(s):
Mo Ehsani
This article introduces the latest fiber-reinforced polymer panel system developed by the author—SPiRe®+. These panels can serve as formwork, corrosion resistant reinforcement, and waterproofing. With their flat and smooth exterior face and protruding T-profiles on the interior face, the panels act as reinforcing elements for strengthening beams, slabs, and walls.
SP365_08
March 1, 2025
Taylor Brodbeck, Giorgio T. Proestos, and Rudolf Seracino
Symposium Papers
365
As glass fiber-reinforced polymer (GFRP) reinforcing bars become more widely used, there is a need to better understand the behavior of GFRP reinforced members. GFRP reinforced deep beams are one example of concrete members that are not currently well understood. Besides the linear elastic behavior of GFRP material, another significant difference between GFRP and steel reinforcement is the difference in surface treatment. While deformation requirements are prescribed for steel reinforcing bars, FRP bars may have different surface treatments depending on the manufacturer. The different surface treatments lead to different bond characteristics and, ultimately, a difference in performance. This research explores the effect of bond through both an analytical study using VecTor2 and a series of large-scale deep beam tests reinforced with GFRP bars. Analytically, VecTor2 was able to capture the behavior of published experiments from the literature, reinforced with sand-coated GFRP bars. An alternative surface preparation consisting of machined indentations was introduced as a parameter in this study, resulting in significant changes in the performance and behavior of the deep beams. VecTor2 was also able to capture the behavior of these beams when adjustments were made to the bond model to match the observations of the experiments.
DOI:
10.14359/51746688
SP365_10
Anca Ferche and Vahid Sadeghian
Developed 40 years ago by Frank Vecchio and Michael Collins, the Modified Compression Field Theory (MCFT) and its successor, the Disturbed Stress Field Model (DSFM), have proven to be robust methodologies in modeling the response of concrete structures. Originally developed for newly designed concrete structures, they have been refined over the years to expand their applicability to various engineering problems, including modeling deteriorated and repaired structures. This paper reviews the evolution and application of MCFT in modeling and assessment of deteriorated and repaired concrete structures. The first part focuses on the application of MCFT to advanced field structural assessment, including stochastic analysis procedures that incorporate field data. The second part discusses the evolvement of MCFT to account for two of the most common deterioration mechanisms, reinforcement corrosion and alkali-silica reaction. The last part explores the application of the model to structures repaired with fiber-reinforced polymer composites. It is concluded that the extension of the MCFT formulation has enabled it to reliably predict the behavior of both deteriorated and repaired concrete structures.
10.14359/51746690
SP364_11
December 1, 2024
364
This theoretical study discusses the serviceability of reinforced concrete beams retrofitted with near-surface-mounted (NSM) carbon fiber reinforced polymer (CFRP) strips. Particularly, the research aims to understand the tension stiffening of the strengthened beams under varying degrees of steel corrosion. Five beams are modeled and analyzed, which represent different levels of deterioration up to 100 years. The effects of tension stiffening are evaluated at service and yield loads. Results show that the tension stiffening of the beams decreases as the cross-sectional area of the steel reinforcement reduces. Likewise, the yield and ultimate capacities of the beams diminish with the reduced steel reinforcement. The effective moment of inertia formula stipulated in ACI 318-19 appears to be applicable to the NSM CFRP-retrofitted beams.
10.14359/51745463
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