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.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
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 461 Abstracts search results
Carlos V. Aguilar, David V. Jáuregui, Brad D. Weldon and Craig M. Newtson
Off-system concrete bridges with no design plans are currently a concern in New Mexico as many exist throughout the State. Load rating these bridges is problematic since the design documentation is limited or missing, thus creating uncertainties regarding the safe load limits. Two prestressed concrete bridges, a double T-beam and box beam bridge, were evaluated using advanced analyses and experimental methods (including load testing and rebar scanning). Both bridges have damaged and/or missing shear keys between the adjacent beams and thus, the load distribution path was uncertain. The bridges were evaluated based on the following procedures: estimating the material properties from past specifications and amount of prestressing steel via Magnel diagrams; verifying the steel estimate with a rebar scanner; load testing based on strain measurements; and rating the bridges using the load test results. Rating factors were determined for legal loads based on serviceability (i.e., concrete cracking) and strength (i.e., shear or flexural capacity). The serviceability ratings from load testing and strength ratings from analytical software were compared to determine the final load ratings and need for posting the bridges.
May 1, 2018
Anna Halicka, Dick A. Hordijk, Eva O.L. Lantsoght
Nowadays, finite element analyses provide information about the performance of a structure, but they are more or less simplified. Therefore, load tests are the only way to find the “real” behavior of an existing bridge subjected to the rating process. In this paper, the state-of-the-art concerning load tests of concrete road bridges is presented, and the problems of the execution of such tests are specified. It is pointed out that only load tests accompanied with current finite element analyses may result in a proper assessment of the level of safety of the bridge. The authors’ procedure of complex assessment of such bridges combines in-situ examination of the structure, load testing, and finite element modeling.
The paper discusses the following topics: aims and fundamentals of static diagnostic and proof load tests; the load application method according to different codes and specifications; the basis for proper assessment of the target load: reliability index, partial factors approach, global rating factor approach; establishing the load allowable on the bridge, based on the applied proof load; and the proposed procedure of assessment of existing concrete road bridges by load testing.
Karthik H. Obla, Daniel J. Gancarz, William R. (Rusty) Owings III, Fouad H. Yazbeck, and David G. Tepke
Performance-based specifications that define explicit durability goals can be successfully used on diverse project types. This article summarizes four examples of such projects (pavement, bridge, development, and column repair) that were presented at a session, Case Studies of Performance-Based Specifications, at The ACI Concrete Convention and Exposition – Spring 2017 in Detroit, MI.
Randall P. Bass and Gary Horninger
Key features of roller-compacted concrete (RCC) dams are highlighted, using various dam types as examples. Topics include lift interfaces, facing systems, spillways, intakes and outlets, internal galleries, and joints. Test sections are recommended for training and to demonstrate that the systems, methods, and equipment proposed for a project will meet project specifications.
February 1, 2018
R. Douglas Hooton, Lawrence Sutter, and Mary Christiansen
There has been a proliferation of research and development activity focused on chemically activated binder technologies and other alternative cements for use in concrete. Some
activated binder technologies have been used successfully in construction or in manufacture of building products. However, a major barrier to adoption of such new materials is the lack
of appropriate test methods and specifications, often precluding their use in structural applications since they are not covered by building codes. Some existing test methods may be suspect for evaluation of new cementing materials because they often do not relate well to field performance for portland cement concrete. However, engineers have experience,
familiarity and a comfort level with using portland cement concrete. In addition to raising specific areas of concern with existing test methods, alternative approaches to adapting
existing test methods or development of new tests specific to evaluation of chemically activated binders and alternative cements are discussed.
August 1, 2017
Results Per Page