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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 981 Abstracts search results
Document:
SP364_11
Date:
December 1, 2024
Publication:
Symposium Papers
Volume:
364
Abstract:
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.
DOI:
10.14359/51745463
CI4611TechSpotlight_Geopolymer
November 1, 2024
Concrete International
46
Issue:
11
Geopolymer International (GPI) specializes in the research, development, and production of geopolymer-based sustainable construction materials. Through the collaborative efforts of GPI, Sustainable Concrete Solutions, and Constructions-3D, universities, artists, hardscape producers, and constructors now have access to cutting edge, recyclable materials and sophisticated 3-D printers.
CI4608NExInsights
August 1, 2024
8
A new certificate program on “Designing Concrete Structures Reinforced with GFRP Bars Using the ACI CODE-440.11-22” is now offered online through ACI University. The program focuses on recently published ACI CODE-440.11-22: Building Code Requirements for Structural Concrete Reinforced with Glass Fiber-Reinforced Polymer (GFRP) Bars—Code and Commentary.
SP-363-4
July 1, 2024
Author(s):
Naveen Saladi, Chandni Balachandran, Robert Spragg, Zachary Haber, and Benjamin Graybeal
363
Corrosion of steel reinforcement is one of the primary contributing factors to bridge deck deterioration. Based on the extent of corrosion, different corrosion mitigation strategies can be used to extend the service life of a bridge deck. Bridge deck overlays are efficient tools in reducing active corrosion. While there are multiple overlay solutions that are commonly deployed, including concrete-based and polymer-based systems, ultra-high performance concrete (UHPC) overlays have gained interest from bridge owners in recent years. Another corrosion mitigation strategy is the application of corrosion-inhibiting chemicals and sealers to a concrete surface to reduce the ingress of deleterious ions. The purpose of this paper is to compare different corrosion mitigation strategies and study the effects of such techniques on the bond between the UHPC overlay and the substrate concrete. UHPC overlays were found to be effective in reducing corrosion rates by more than 50 percent. Sealers and corrosion inhibitors applied to the concrete substrate in combination with placing a UHPC overlay reduced the corrosion rates even further. However, sealers and corrosion inhibitors appeared to negatively affect bond strength, potentially increasing the likelihood of overlay delamination.
10.14359/51742107
SP-363-8
Ali Alatify and Yail J. Kim
This paper presents the prediction of bond strength between ultra-high performance concrete (UHPC) and fiber reinforced polymer (FRP) reinforcing bars using an artificial neuronal network (ANN) approach. A large amount of datasets, consisting of 183 test specimens, are collected from literature and an ANN model is trained and validated. The ANN model includes six variable inputs (bar diameter, concrete cover, embedment length, fiber content, concrete strength, and rebar strength) and one output parameter (bond strength). The model performs better than other models excerpted from existing design guidelines and previously published papers. Follow-up studies are expected to examine the individual effects of the predefined input parameters on the bond strength of UHPC interfaced with FRP rebars.
10.14359/51742111
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The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.