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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 7 Abstracts search results
Document:
CI3110Adan
Date:
October 1, 2009
Author(s):
Scott M. Adan and René W. Luft
Publication:
Concrete International
Volume:
31
Issue:
10
Abstract:
The authors were contracted to evaluate a severely damaged parking garage in Northern California. The structure’s slab exhibited extensive cracking, visible deflections, and a partially collapsed area, indicating a one-time overload. Detailed assessment included the use of ground-penetrating radar surveys to locate reinforcing bars and strands as well as tests of core samples to determine the concrete properties. Repairs included selective replacement of damaged slabs, epoxy injection of cracks, installation of external post-tensioning tendons, and reseating of the existing tendons to a higher tension level. The excessive slab deflections were removed and the structure was restored to service.
CI2904Tarr
April 1, 2007
Scott Tarr and Calvin McCall
29
4
After providing a summary of the causes and functional effects of curling/warping of concrete slabs on ground, the positive and negative aspects of potential mitigation methods are discussed. These methods include cutting additional joints, grinding of edges, patching low zones, filling voids below the slabs, partial-depth concrete removal and replacement, and installation of dowels.
CI2811Lane
November 1, 2006
Becca Lane and Tom Kazmierowski
28
11
In 2004, the Ministry of Transportation Ontario conducted a trial project to evaluate three precast concrete slab repair construction techniques for concrete pavements: the Michigan Method, the Fort Miller Super-Slab® Intermittent Method, and the Fort Miller Super-Slab® Continuous Method. The methods differed in how the base was prepared and how the precast slab was installed and dowelled to the adjacent concrete. Details of the repair installation are presented along with the results of nondestructive testing to determine load transfer efficiency across the joints.
CI2212Vaysburd
December 1, 2000
A. M. Vaysburd, P. H. Emmons, J. E. McDonald, R. W. Poston, and K. Kesner
22
12
This article is the third in a series reporting on the research study with the ultimate goal of developing performance criteria for selection of cementitious repair materials dimensionally compatible with the existing concrete. The field testing phase of the overall program described herein included installation of selected repair materials in the cavities of the prefabricated concrete slabs and monitoring them for an 18-month period. In addition, the cracking resistance of the materials was evaluated in the German Angle Test and SPS Plate Test. The testing program was carried out in three areas: South Florida, Illinois and Arizona. The results of the field performance are presented.
SP93-24
September 1, 1986
G. K. Gunnyon and D. R. Morgan
Symposium Papers
93
The Pier 6-C structure in the inner harbour area of Vancouver was selected as the site for construction of the Canada Place Trade and Convention centre. The project includes a five-berth cruise ship facility and a major 514 room hotel. The original Pier B-C was constructed by Canadian Pacific Railway between 1923 and 1927, and consisted of a central berm projecting 330 m (1080 ft.) from the shore, surrounded by a reinforced concrete deck supported by approximately 6000 precast reinforced concrete piles driven into the berm. A detailed assessment of the structure showed that it was suitable, after rehabilitation of deteriorated areas, for use as the substructure for the Canada Place project. As construction progressed substantial additional damage was done to the pier because of movements caused by installation of additional pre-cast concrete piles and steel caissons to support the new structures. This paper describes the original assessment of the pier structure, evaluation of construction damage, and preparation of repair specifications. While extensive repair by shotcreting procedures was required, this paper concentrates on the epoxy injection repair aspects of the remedial work. Epoxy injection was used to achieve structural repair of reinforced concrete beams, piles, pilecaps, seawalls and deck slabs.
DOI:
10.14359/6317
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