International Concrete Abstracts Portal

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International Concrete Abstracts Portal

Showing 1-5 of 888 Abstracts search results

Document:

SP-323_12

Author(s):

Jeffrey Weidner, John Prader, Nathaniel Dubbs, Franklin Moon, A. Emin Aktan, John Taylor, and Clifford Skeens

Publication:

Special Publication

Volume:

323

Issue:

  

Abstract:

The state of West Virginia is home to a substantial population of bridges that are in service well past their initial design lives. As these bridges have aged, and inevitably deteriorated, management has become a challenge. In 2006, The West Virginia Division of Highways (WVDOH) enlisted the help of Drexel University to develop an approach to managing these structures, with a particular focus on reinforced concrete bridges with little to no documentation. One such structure was the Barnett Bridge, located near Parkersburg, WV. This filled concrete arch bridge was built in 1929 with a 90 foot (27.4m) single span over a small creek. The bridge was posted due to challenges in accurately load rating the structure with only minimal historical documentation. Working side by side with WVDOH, and through a combination of load testing, repairs, and targeted long-term monitoring, the bridge was left in service. This paper presents the case study of the Barnett Bridge, from when it appeared in the local newspaper in 2008 as one of the bridges in the state with the lowest sufficiency rating, to present day where it still serves the surrounding area, with a focus on the proof load test that served as the cornerstone for the revitalization of this structure.

Date:

May 1, 2018

  


Document:

CI4005Obla

Author(s):

Karthik H. Obla, Daniel J. Gancarz, William R. (Rusty) Owings III, Fouad H. Yazbeck, and David G. Tepke

Publication:

Concrete International

Volume:

40

Issue:

5

Abstract:

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.

Date:

May 1, 2018

DOI:

  


Document:

SP324_04

Author(s):

Mahmut Ekenel, Francisco De Caso y Basalo, Antonio Nanni

Publication:

Special Publication

Volume:

324

Issue:

  

Abstract:

Repair and strengthening of concrete and masonry structures using fabric-reinforced cementitious matrix (FRCM) and streel-reinforced grout (SRG) are emerging technologies in the industry allowing engineers and contractors to effectively remove deficiencies, improve structural performance and prolong life of existing concrete or masonry structures. FRCM is a composite consisting of one or more layers of cement- or hydraulic-based matrix reinforced with dry fibers in the form of open fabric. Similarly, SRG consists of a matrix reinforced with cords of twisted micro steel wires woven to form a fabric (mesh). Acceptance Criteria AC434 was published to provide guidelines for the evaluation of FRCM/SRG strengthening of concrete and masonry structural elements because the building codes in the USA do not have requirements for testing and determination of structural capacity, reliability and serviceability of this class of composite technologies. AC434 establishes requirements for testing and calculations that can lead to the issuance of a product research reports as evidence of a product’s building code compliance. This paper summarizes and presents the key features of AC434 and its relationship to ACI committee 549.4R, the guide to design and construction of externally bonded FRCM and SRG systems for repair and strengthening concrete and masonry structures.

Date:

April 1, 2018

  


Document:

CI4004Thomas

Author(s):

Robert J. Thomas, Marc Maguire, Andrew D. Sorensen, and Ivan Quezada

Publication:

Concrete International

Volume:

40

Issue:

4

Abstract:

In the North American market, calcium sulfoaluminate (CSA) cement is primarily used as a rapid pavement repair material. This article provides an overview of the unique features and benefits of CSA cement, the durability of CSA cement concrete, and ongoing and potential applications within the concrete industry.

Date:

April 1, 2018

DOI:

  


Document:

CI4004Saldua

Author(s):

Benjamin P. Saldua, Ethan C. Dodge, Peter R. Kolf, and Carlton A. Olson

Publication:

Concrete International

Volume:

40

Issue:

4

Abstract:

Nondestructive testing was used to evaluate concrete consolidation in an antenna pedestal recently constructed at the Canberra Deep Space Communications Complex in Australia. Evaluations were based on impulse-response tests, ultrasonic shear-wave tomography, core tests, and visual observations. The work showed that impulse-response testing allows rapid, reliable identification of significant defects. The consequent repair program is summarized.

Date:

April 1, 2018

DOI:

  


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