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International Concrete Abstracts Portal

Showing 1-5 of 47 Abstracts search results

Document: 

SP-361_06

Date: 

March 1, 2024

Author(s):

Michelle L. Hendrickson, Christine A. Langton, and Joan Q. Wu

Publication:

Symposium Papers

Volume:

361

Abstract:

Sixty percent of the nation's highly toxic and radioactive mixed wastes are stored at Hanford in 177 deteriorating underground storage tanks. To close or remove these storage tanks from service and place them in a condition that is protective of human health and the environment, the tanks must be physically stabilized to prevent subsidence once wastes have been retrieved. Remaining residual liquid waste in the tanks that cannot be removed must be solidified and the solid wastes encapsulated to meet the Nuclear Regulatory Commission, Department of Energy, Environmental Protection Agency, and the State of Washington requirements. The Department of Energy has developed cementitious flowable concretes to restrict access and provide chemical stabilization for radionuclides. Formulation, laboratory, and field testing for application at Hanford began with flowable, self-leveling structural and non-structural fills. A slump flow equal to or greater than 610 mm, 0% bleed water, and 0.1% (by volume) shrinkage measurements were key parameters guiding reformulation efforts that resulted in highly flowable, self-consolidating concretes that met Hanford 241-C Tank closure short- and long-term regulatory and engineering performance requirements.

DOI:

10.14359/51740608


Document: 

SP356_11

Date: 

October 1, 2022

Author(s):

Ahmed G. Bediwy and Ehab F. El-Salakawy

Publication:

Symposium Papers

Volume:

356

Abstract:

Deep beams are common elements in concrete structures such as bridges, water tanks, and parking garages, which are usually exposed to harsh environments. To mitigate corrosion-induced damage in these structures, steel reinforcement is replaced by fiber-reinforced polymers (FRPs). Several attempts have been made during the last decade to introduce empirical models to estimate the shear strength of FRP-reinforced concrete (RC) deep beams. In this study, the applicability of these models to predict the capacity of simply supported deep beams with and without web reinforcement was assessed. Test results of 54 FRP-RC, 24 steel-fiber-reinforced concrete (FRC), and 7 FRP-FRC deep beams were used to evaluate the available models. In addition, a proposed model to predict the shear strength of FRPFRC deep beams was introduced. The model was calibrated against experiments conducted previously by the authors on FRP-FRC deep beams under gravity load. The model could predict the ultimate capacity with a mean experimental-to-predicted value of 1.04 and a standard deviation of 0.14.

DOI:

10.14359/51737270


Document: 

SP353

Date: 

June 1, 2022

Author(s):

Sponsored by: ACI Committee 421

Publication:

Symposium Papers

Volume:

353

Abstract:

The purpose of this symposium and special publication is to recognize and honor Professor Amin Ghali’s outstanding long-term dedication to the concrete industry. Dr. Ghali obtained his B.Sc. and M.Sc. degrees in Civil Engineering from Cairo University, Cairo, Egypt, respectively in 1950 and 1954, his Ph.D. from Leeds University, England in 1957. He spent ten years in engineering practice before joining at the University of Calgary, AB, Canada as a professor in 1966. Dr. Ghali has developed the revolutionary, multi-patented and globally used, headed-stud shear reinforcement systems for concrete flat slabs; he has been a consultant for a number of major international structures, including offshore structures, multi-story buildings, bridges, and tanks. Dr. Ghali authored over 300 papers and eight patents. In 15 editions and 6 translations, his books include: Structural Analysis Fundamentals (2022), Structural Analysis: A Unified Classical and Matrix Approach (2017), Circular Storage Tanks and Silos (2014), and Concrete Structures: Stresses and Deformations (2012). Professor Ghali has served the industry in many ways, including his role as a voting member of ACI Committee 435, Deflection of Concrete Building Structures, 343, Concrete Bridge Design, and 421, Design of Reinforced Concrete Slabs. Jointly with associates at University of Calgary, his research on punching shear design and control of long-term deflection enables design of affordable concrete floors. Dr. Ghali served as expert, providing technical testimony, for a number of complicated engineering cases. Dr. Ghali received a number of teaching and research excellence awards over his long career, and was elected a Fellow of ACI, ASCE, CSCE, and CAE; in 2017, he received the Top 7 Over 70 Award for his outstanding continued research and engineering contributions. The papers found in this SP publication encompass a broad overview on the important issues related to punching shear resistance and sustainable serviceability of flat plates from both a theoretical and design perspectives. These papers formed the basis of presentations made at the Amin Ghali Symposium on Design of Structural Concrete Slabs for Safety Against Punching and Excessive Deflection held at the ACI Fall 2020 Virtual Convention, on October 25, 2020. Twelve presentations were made in two sessions by those who have worked closely with Dr. Ghali in his areas of interest. The SP includes nine papers on design of concrete floors for punching and for serviceability. The sessions were sponsored by ACI Committee 421, Design of Reinforced Concrete Slabs. All papers in this publication were reviewed by at least two recognized experts in accordance with ACI review procedures. Special thanks are extended to all who helped to make the two technical sessions and accompanying publication a success.

DOI:

10.14359/51737125


Document: 

SP326-97

Date: 

August 10, 2018

Author(s):

Lyudmila Elshina, Vyacheslav Yarmakovskiy, Igor Kirillov, and Vladimir Panteleev

Publication:

Symposium Papers

Volume:

326

Abstract:

Since 2014 the Research Institute of Concrete and Reinforced Concrete, named after A. Gvozdev of Research Center "Construction", provides scientific and technical support of construction of unique transport hub facilities and a Liquefied Natural Gas (LNG) plant with a capacity of 36,376.3 million pounds [16,5 million tons] per year on the source of the South Tambey field in the Yamal-Nenets National District.

The Institute has developed recipes for concrete of liquefied gas tank and underground structures, has controlled over the reinforcement, casting and care during the hardening of concrete structures. The newest equipment for the production, transportation and concreting of common and prestressed structures were implemented. Hypothetical leak of LNG from the reinforced tanks can result into unacceptable consequences. Due to complex interaction of the harsh climate conditions, intrinsic unstable geotechnical base and vulnerability of Arctic environment can escalate into cascade accident. In order to eliminate the major accidents or to minimize the consequences within the acceptable margins a multi-tier safety framework should be administrated and placed. The key findings from accumulated scientific and engineering experience are described as the practice-oriented cases.

DOI:

10.14359/51711080


Document: 

SP285-13

Date: 

May 1, 2012

Author(s):

Daniel J. McCarthy and Lars F. Balck

Publication:

Symposium Papers

Volume:

285

Abstract:

The authors provide a history of the seventy year old wire-wrapped circular prestressed concrete tank industry from three perspectives: 1) evolution of key design and detailing practices; 2) durability and performance; and 3) evolution of professional industry standards.

DOI:

10.14359/51683936


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