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Home > Publications > International Concrete Abstracts Portal
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.
Showing 1-5 of 477 Abstracts search results
November 1, 2018
Alvaro Ruiz Emparanza, Raphael Kampmann and Francisco De Caso y Basalo
One of the main reasons for the degradation of our infrastructure is steel corrosion in reinforced concrete. To com- bat that issue, alternative non-corrosive materials, such as fiber reinforced polymer (FRP) rebars, were developed and implemented as internal reinforcement for concrete structures. Because of significant physio-mechanical advantages (magnetic transparency, high strength, corrosion resistance, etc.), the adoption of FRP rebars increased rapidly through- out the last decades. Due to an increased material demand, the number of FRP rebar manufacturers grew, but each manufacturer started to develop proprietary products, with wide ranging properties — the industry is in need for guidance and unification. Therefore, this study aims to centralize the relevant information by (i) summarizing the globally available regulations, (ii) providing background data for the present production status, and (iii) listing the currently produced FRP rebars in an effort to compare their physio-mechanical properties. Analysis of the market showed that 27 manufacturers produce FRP rebars in 14 countries with diverse output quantities and different distribution logistics. The various production approaches lead to different rebar types with dissimilar surface properties and significant strength differences.
Wassim M. Ghannoum, Nawaf K. Alotaibi, Jose Garcia, Chang Hyuk Kim, Yungon Kim, Douglas Pudleiner, Kevin Quinn, Neil Satrom, William Shekarchi, Wei Sun, Helen Wang, and James O. Jirsa
Strengthening using carbon fiber reinforced polymers (CFRP) provides a valuable addition to available structural preservation and life extension techniques. Damaged bridges can be repaired efficiently while structurally deficient bridges can be effectively retrofitted to higher load capacities using CFRP materials. A large research program has been ongoing since 2008 in Texas to demonstrate the effectiveness of using anchored CFRP sheets in shear strengthening of reinforced concrete bridge beams and girders. The research program has encompassed three main thrusts: 1) over 70 large-scale tests of concrete bridge sections strengthened using externally applied anchored CFRP sheets, 2) small-scale tests aimed at developing CFRP anchor design criteria as well as a simple test procedure for quality control of materials and installation, and 3) developing design specifications for CFRP anchors and sheets in shear strengthening applications. An overview of the experimental findings of the program is presented.
Paolo Rocchetti, Guillermo Claure, Francisco De Caso, and Antonio Nanni
The aim of this project is to develop the necessary design knowledge to implement GFRP reinforcement in concrete traffic barriers. Innovation lies in the use of GFRP closed continuous stirrups that became recently available. The design method relies on AASHTO-LRFD Bridge Design Specification and the latest development in specifications issued by the Florida Department of Transportation (FDOT) for Reinforced Concrete (RC) Traffic Barriers. After a review of design procedures for traffic barriers and understanding the mechanical characteristics of GFRP reinforcement, a modified design approach is proposed to reduce GFRP reinforcement amounts and complexity in construction. Supported on experience gained from designing FDOT 32” F–Shape (F32) GFRP RC used in the Halls River Bridge Replacement Project, this study also addressed the 36”–Single Slope (SS36) traffic barrier to be adopted by FDOT in coming years.
Can ACI codes, specifications, guides, and reports
be referenced in building codes, project
specifications, or contract documents?
September 26, 2018
B. Stein, R. Ryan, Y. Bu, and K. Vallens
One of the important objectives of enhancing the sustainability of concrete construction consists of reducing the unwanted rebuilding of the same and extending the service life of buildings, structures and pavements. Proper maintenance, preservation and rehabilitation practices extend service life and improve structural and functional performance of transportation infrastructure. Minimization of impact on traffic is an important requirement for selecting materials and methods of maintenance and repair. Use of rapid strength concrete (RSC) that develops compressive strength of 2500 - 3500 psi (17.2 – 24.1 MPa) in 1.5 – 5 hours is one solution for reducing the duration of closures of highways and structures during repairs. The paper discusses: (i) Principles of proportioning of RSC; (ii) Performance of RSC; (iii) State-of-art practices; and (iv) Performance specifications for RSC.
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