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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 7 Abstracts search results
Document:
SP276-01
Date:
March 1, 2011
Author(s):
Clifford N. MacDonald
Publication:
Symposium Papers
Volume:
276
Abstract:
In 1994, the bridge over Interstate 90 at mile marker 212 in South Dakota, USA, used synthetic fiber reinforced concrete in the approach, deck topping, and Jersey barriers. Crack widths were measured and counted on the three applications with a histogram developed for the Jersey barrier. The synthetic fiber dosages were 1.3% and 1.6%. This location and applications have been monitored almost yearly and more thoroughly in 2007. Comments, including crack history, on other applications placed 1994 to 1995 and 2002 to 2006 are included for comparison. Further comparisons include synthetic fiber reinforced concrete with and without conventional steel reinforcing, and with plain concrete. There is a significant measurable difference in crack frequency and width with a decided benefit from synthetic fiber reinforcement. The historical and philosophical review is accomplished with selected examples of synthetic fiber reinforced concrete projects to allow for a generalized beneficial conclusion.
DOI:
10.14359/51682359
SP276-06
Kamal S. Tawfiq, Brenda Robinson, and Nur Yazdani
The objective of this study was to investigate the possibility of using steel fiber reinforced concrete (SFRC) to enhance the performance of in the anchorage zone and to minimize the amount of mild steel reinforcement required by the code. For that purpose, different ratios per volume of different steel fibers were used in the study. The basic SFRC properties were obtained and then used in a thorough finite element analysis on 3D models of SFRC blocks representing the anchorage zone. The purpose of the numerical analysis was to define the proper dimensions of the need block specimens for laboratory testing, and to determine the locations of the internal and external strain gages in the block. Test results showed that the addition of steel fibers improved the loading capacity of the anchorage blocks. Further finite element analysis on 3D models proved that addition of 0.5 percent by volume of fiber was enough to reduce the mild steel reinforcement at the anchorage zone by about 40 percent. However, such an option needs to be dealt with caution. The addition of steel fiber to substitute mild steel could result in an abrupt failure in the anchorage zone.
10.14359/51682364
SP276-04
L.A.P Lourenco, J.A.O Barros, and J.G.A Alves
In the last decades, technical and scientific efforts have been done to increase the concrete strength, based on the assumption that more economic, lightweight, durable and good looking structures can be built. This strength enhancement, however, has been obtained by increasing the compactness of the concrete internal structure, resulting concretes with voids of smaller size, and lower connectivity than in concretes of current strength classes. Research and fire accidents have shown that the concrete failure of structures exposed to fire is as explosive as high is the concrete strength class, since the restrictions for the escape of water vapor from the interior of concrete increase with the concrete compressive strength. In the present work a fiber reinforced concrete of enhanced fire resistance is developed and its properties are characterized by experimental research. This concrete is intended to have enough strength for concrete precast tunnel segments, while the performance of the fibrous reinforcement system is evaluated in terms of verifying its possibilities for replacing, partially or totally, conventional reinforcement used in these structural elements.
10.14359/51682362
SP276-05
Shih-Ho Chao, Jae-Sung Cho, Netra B. Karki, Dipti R. Sahoo, and Nur Yazdani
The evaluation of the properties of FRC mixtures is of prime importance for these mixtures to be used effectively and economically in practice. Although currently there are various standards or testing methods for evaluation of the properties of FRC, there is no agreement on which standard is the best for a specific structural application. This can be a major reason that has inhibited the introduction of FRC into structural design code. This study investigated three major different material evaluation methods, i.e. uniaxial direct tensile test, third-point bending test, and round panel test, as well as behavior of specimens tested by the three methods. The advantages and limitations of those methods are discussed.
10.14359/51682363
SP276
Editors: Corina-Maria Aldea and Nur Yazdani / Sponsored by: ACI Committee 544
This CD-ROM contains six papers that were presented at sessions sponsored by ACI Committee 544 at the Spring 2008 ACI Convention in Los Angeles, CA, and the Spring 2009 ACI Convention in San Antonio, TX. The papers provide insight into the state of the art of the topic in academia, the industry, and real-life applications and cover some of the benefits of using fibers to enhance long-term performance of concrete with and without conventional reinforcement. Note: The individual papers are also available. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP-276
10.14359/51682325
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