ABOUT THE 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.

International Concrete Abstracts Portal

Showing 1-5 of 27547 Abstracts search results

Document: 

MNL6620

Date: 

October 22, 2020

Abstract:

The 2020 edition of the ACI Detailing Manual, MNL-66, provides answers to many detailing questions asked by design engineers, architects, contractors, detailers, and engineering students. The Manual is divided in three sections: Section 1 includes a copy of ACI 315R-18, Guide to Presenting Reinforcing Steel Design Details; Section 2 includes individual details with corresponding checklists; and Section 3 includes a compilation of Concrete International articles chosen for their relevance to detailing reinforced concrete. Appendix A has tables to help the engineer in the detailing effort. Section 1 guides designers of concrete structures in determining information and design details that are required to prepare reinforcing steel fabrication and placing drawings. The guide stresses the importance of this information to ensure that the reinforcing steel detailer effectively and accurately captures the intent of the designer, presenting it in a manner that is clear and unambiguous to the reinforcing steel fabricator and placer. Section 2 illustrates methods for presenting necessary design information through over 100 individual details that provide examples of ways to communicate design information effectively and completely to the contractor. The details conform to “Building Code Requirements for Structural Concrete (ACI 318-19)” and were prepared with the assistance of a task group consisting of detailers, contractors, and practicing engineers. Each detail is placed on one page with dimensions and bar sizes left to be completed by the user. Alongside each detail, notes to the user are listed as a reminder of the main code requirements that need to be satisfied for that particular detail. This section is planned to be interactive with the engineering community. It is anticipated that engineers, architects, contractors, and detailers will not only submit comments to improve the details shown in this edition of the manual, but also submit other relevant details to be added to future editions at techinq@concrete.org. Section 3 includes a collection of 37 articles published in Concrete International related to concrete detailing that were authored by detailers and practicing engineers. The articles identify constructability issues specific to reinforcing steel. Common problems found on engineering drawings are discussed along with solutions drawn from the experiences of knowledgeable practitioners in the industry. The article topics vary from describing the tolerance cloud to addressing constraints in reinforcing bar modeling to avoiding ambiguous callouts, among other topics. These solutions are not offered as official ACI-recommended practice. Supporting reference data in Section 4 includes specific chapters on reinforcing bars, wires, bar supports, spirals, mathematical formulas and tables, and common symbols and abbreviations. This guide is intended to provide examples and guidance for how licensed design professionals may satisfy the prescribed provisions of ACI 318-19, Building Code Requirements for Structural Concrete. It does not, however, purport to represent the only suitable way to satisfy the requirements for every project. Engineering judgment must be applied to the unique requirements of individual projects and the details should be modified accordingly before applying to a project.


Document: 

ACI 2019 Fall Convention

Date: 

October 22, 2020

Author(s):

Eric Ferrebee

Abstract:

There are several ACI guides available for designing and constructing low volume parking lots and roads as well as commercial industrial facilities using conventional concrete. Additionally, other ACI reports cover the use of roller compacted and pervious concrete materials as a wearing surface and soil cement as a foundational element. There are also on-line pavement design methods that practitioners can use when the ACI design tables are not applicable to their specific project constraints. Navigating all of these resources can be challenging to the practitioner so this session will compile the available ACI resources, assist users in determining when the ACI design tables may be used, and cover some of the other tools available to supplement the ACI guides and reports when necessary.


Document: 

ACI 2019 Fall Convention

Date: 

October 22, 2020

Author(s):

Peter C. Taylor

Abstract:

Concrete overlays of existing pavements can be important tool for street owners to extend the life of their local network. Concrete overlays allow cities and counties to save the labor and cost of removing an existing pavement. Concrete is also competitive on a first-cost as well as a lifecycle basis. One of the most significant advantages to concrete overlays is that an owner can keep the equity that they have achieved in the existing pavement and do not lose the long-term investment that has already been made. This session will discuss the various concrete overlay options, what owners may expect in terms of extended life, construction methods that can accelerate project completion, and traffic maintenance options.


Document: 

ACI 2019 Fall Convention

Date: 

October 22, 2020

Author(s):

Amanda Hult

Abstract:

Long-term performance of concrete streets and roads are not only a function of using the correct cross-sectional design but is also affected by the construction and jointing process. Proper specification development, construction practices, and application/implementation of the right details also highly influence overall pavement performance. The session will discuss state of the art construction methods and equipment, proper design and construction of joints, and the use of relatively new jointing systems to enhance load transfer. The session will also touch on how two ACI reports, ACI 325.14R on proportioning concrete mixtures and 325.9R on constructing concrete pavements, should be used in conjunction with the design document 325.12R to maximize pavement performance.


Document: 

SP344

Date: 

October 21, 2020

Publication:

Symposium Papers

Volume:

344

Abstract:

The design and analysis of structural concrete elements is a topic of practical interest. While sometimes the effect of torsion is only addressed based on simple examples, practicing engineers are faced with the need to include the effects of torsion in their designs of a variety of structures and load arrangements. This Special Publication (SP) contains papers about the design of reinforced and prestressed concrete elements for torsion. The focus of the SP is on practical design examples according to different concrete bridge and building codes. In addition to the design examples, papers dealing with the current state of the art on torsion in structural concrete, as well as recent advances in the analysis and design of concrete elements failing in torsion, are added. The objectives of this SP are to provide practicing engineers with the tools necessary to better understand and design concrete elements for torsion. The need for this SP arose after the development of the State-of-the-Art Report on Torsion of Joint ACI-ASCE Committee 445 “Shear and Torsion” and Subcommittee 445-E “Torsion”. Usually, the attention that is paid to torsion in engineering education is limited to simplified textbook examples. The examples in this SP show applications in bridges and buildings, where the torsion design is combined with the design for flexure and shear. Additionally, the examples in this SP give insight on the different outcomes when using different bridge and building codes. Finally, the papers that include theoretical considerations give practicing engineers a deeper understanding and background on torsion in structural concrete. The views from an international group of authors are included in this SP, subsequently representing a variety of building and bridge codes the engineer may encounter in practice. In particular, authors from the United States, Canada, Ecuador, the Netherlands, Italy, Greece, and the Czech Republic contributed to the papers in this SP. Views from academia and the industry are included. To exchange experience in the design of torsion-critical structures as well as new research insights on torsion, Joint ACI-ASCE Committee 445 and Subcommittee 445-E organized two sessions titled “Examples for the Design of Reinforced and Prestressed Concrete Members under Torsion” at the ACI Fall Convention 2020. This SP contains several technical papers from experts who presented their work at these sessions, in addition to papers submitted for publication only. In summary, this SP addresses numerous practical examples of structural elements under torsion in bridges and buildings, as well as insights from recent research applied to practical cases of elements under torsion. The co-editors of this SP are grateful for the contributions of the authors and sincerely value the time and effort they invested in preparing the papers in this volume, as well as the contributions of the reviewers of the manuscripts.


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