In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
ACI World Headquarters
38800 Country Club Dr.
Farmington Hills, MI
ACI Middle East Regional Office
Second Floor, Office #207
The Offices 2 Building, One Central
Dubai World Trade Center Complex
Phone: +971.4.516.3208 & 3209
Chat with Us Online Now
Feedback via Email
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 427 Abstracts search results
October 1, 2020
Constantin E. Chalioris, and Chris G. Karayannis
Recently the use of special reinforcement arrangements has been extended in reinforced concrete
members under torsion. These arrangements include (a) continuous rectangular spiral reinforcement, (b) epoxy
bonded Carbon Fiber Reinforced Polymer (C-FRP) sheets as external transverse reinforcement and (c) short steel
fibers as mass reinforcement. In this study an extended experimental program of 14 beams tested under torsion is
presented. All specimens have the same geometrical characteristics but different transverse reinforcement
arrangements. Six beams are used as pilot specimens; three of them have no transverse reinforcement and three have
conventional steel stirrups. Further, two specimens have continuous steel spirals; four specimens have steel fibers as
mass reinforcement and two specimens have externally bonded C-FRP sheets. The torsional behavior of these
specimens is presented and compared to the behavior of the pilot specimens. Discussion and explanatory design
examples about the application of these reinforcements are also included.
Meda, A.; Rinaldi, Z.; Spagnuolo, S.; De Rivaz, B.; Giamundo, N.
The interest in using fiber reinforced concrete (FRC) for the production of precast
segments in tunnel lining, installed with Tunnel Boring Machines (TBMs), is continuously
growing, as witnessed by the studies available in literature and by the actual applications. The
possibility of adopting a hybrid solution of FRC tunnel segments with Glass Fiber Reinforced
Polymer (GFRP) reinforcement is investigated herein. Full-scale tests were carried out on
FRC segments with and without GFRP cage, with a typical geometry of metro tunnels. In
particular, both flexural and point load full-scale tests were carried out, for the evaluation of
the structural performances (both in terms of structural capacity and crack pattern evolution)
under bending, and under the TBM thrust. Finally, the obtained results are compared, in order
to judge the effectiveness of the proposed technical solution.
April 1, 2020
Sary A. Malak and Neven Krstulovic-Opara
This paper provides an overview of simplified methods for dynamic blast analysis of structural members. The presented approach focuses on the use of a general simplified non-linear single degree of freedom dynamic model commonly used for typical flexural members such as slabs, beams or columns. The presented approach also allows modeling of members retrofitted against blast loading using fiber composites. The fiber composites considered in this paper include conventional Steel Fiber Reinforced Composites (FRC) as well as High Performance Fiber Composites (HPFRC). HPFRC’s include Short Steel Slurry Infiltrated Concrete (SIFCON), Long Continuous Slurry Infiltrated Steel Fibers Mat Concrete (SIMCON), and Fiber Reinforced Polymers (FRP). The model identifies different material parameters that affect the response of the structure. The effect of the material properties on the composite response is discussed within the framework of the existing blast-resistance guidelines and standards. Different retrofit techniques for existing concrete structures using fiber reinforced composites and the effect of varying the composite material properties on the response is presented. Final conclusions and recommendations are provided in terms of composite material’s properties, modeling performance and response. Specific limitations on their use is also discussed.
Raymon W. Nickle and Yail J. Kim
With over 80 years of history, it is only in the last 20 years that the use of fiber reinforced polymer (FRP) materials has become feasible for bridge applications in part due to the ever increasing requirement to make structures last longer, with the current American Association of State Highway Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications requiring that structures be designed for a 75 year design life; but also in the development of cost effective production techniques, and the introduction of FRP materials, which bring the cost and strength of FRP materials closer to traditional steel reinforcement. Published documents provide comprehensive recommendations on design methodology, predictive equations, and recommendations for strength and service limits states. In this paper, the background of FRP-prestressed concrete bridges is discussed and trial bridges are designed. Research needs to advance the state of the art are identified and delineated.
Santosh Timilsina, Nur Yazdani, Eyosias Beneberu, and Abel Mulenga
Fire is a possible hazard on highway bridges which causes significant economic damage, and it is also one of the least investigated of all hazards. There is a lack of knowledge on the long term performance and structural integrity of fire damaged and fiber reinforced polymer (FRP) laminate retrofitted bridges. One such rare in-service bridge was selected for this study. The fire damaged cast-in-place non-prestressed girders were previously repaired with mortar and strengthened with FRP wrapping. The girders were instrumented with strain gages and displacement transducers, and a non-destructive live load test was carried out to evaluate the structural response. The results from the load testing were used to compare two identical girder spans with and without CFRP strengthening. A full-scale non-linear finite element model of the overall bridge superstructure was created, and the test results used to calibrate the model. The carbon (CFRP) strengthened girder exhibited similar stiffness compared to the undamaged girder as evidenced by almost equivalent mid-span deflection. The girder moment capacity decreased significantly due to fire damage, and the CFRP strengthening plus mortar repair was successful in restoring the moment capacity. The finite element model provided good correlation with load test results.
Results Per Page
Please enter this 5 digit unlock code on the web page.