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International Concrete Abstracts Portal

Showing 1-5 of 27 Abstracts search results

Document: 

SP215-22

Date: 

August 1, 2003

Author(s):

A. Abdelrahman, M. Mohamadien, S. Rizkalla, and G. Tadros

Publication:

Symposium Papers

Volume:

215

Abstract:

Use of ACM in the form of FRP laminates in rehabilitation of concrete structures is the prime application of ACM in Egypt. FRP laminates are applied for strengthening reinforced concrete slabs or beams in flexure and shear as well as for confinement of reinforced concrete columns. This paper briefly introduces selected projects to demonstrate the current practice of FRP in Egypt. In the first application, carbon FRP (CFRP) laminates in the form of strips and sheets were applied to strengthen a public building suffering from differential settlement of the foundation. In a different application, CFRP laminates were used to upgrade a residential building to be used for commercial purpose. The paper summarizes the design aspects, construction details and recommendations for future application of ACM.

DOI:

10.14359/12877


Document: 

SP215-17

Date: 

August 1, 2003

Author(s):

R. J. Watson

Publication:

Symposium Papers

Volume:

215

Abstract:

It is the intent of this paper to update developments in the fascinating field of composites. Special topics will include, masonry walls, blast effect technology, and bridge column and bent rehabilitation and arch bridge restoration. "Technology is a queer thing, it brings you great gifts with one on hand and stabs you in the back with the other" (C.P. Snow). It remains for us to keep abreast of the latest developments in composite technology to stimulate our thinking and keep us ahead.

DOI:

10.14359/12872


Document: 

SP215-11

Date: 

August 1, 2003

Author(s):

S. F. Brena and M. A. Steves

Publication:

Symposium Papers

Volume:

215

Abstract:

This paper presents the application of carbon fiber reinforced polymer (CFRP) composites to strengthen an existing reinforced concrete bridge in Texas. The composites were used to increase the flexural strength of the bridge so that it would comply with the load rating required to qualify for roadway widening. The existing pangirders in the bridge required a 53% increase in the nominal flexural strength to meet the H-20 load rating required by the Texas Department of Transportation. Two strengthening systems were utilized in different spans of the bridge. The design methodology of these designs was validated in the laboratory by conducting full-scale tests of strengthened bridge components. Results from the laboratory tests indicated that the target required flexural strength was achieved with both designs. The bridge will be inspected periodically to identify any distress that may occur in the composite laminates.

DOI:

10.14359/12866


Document: 

SP215-06

Date: 

August 1, 2003

Author(s):

R. Gastmeyer and R. C. Donahey

Publication:

Symposium Papers

Volume:

215

Abstract:

A new connector system and a new method for the construction of partially precast concrete sandwich panels are described. The new connectors are constructed using glass fiber reinforced polymer and are used to tie two precast concrete layers together through a layer of rigid extruded polystyrene insulation. In contrast to existing connector systems that incorporate steel lattice girders, the new system effectively eliminates thermal bridges and undesirable forced compatibility strains in the concrete layers. In addition to providing energy savings for the building owner, the new system and method can provide cost savings for the wall fabricator.

DOI:

10.14359/12861


Document: 

SP215-21

Date: 

August 1, 2003

Author(s):

T. Alkhrdaji and J. Thomas

Publication:

Symposium Papers

Volume:

215

Abstract:

To prevent future blowouts of sections of the 50-year-old pipe, the Providence Water Supply Board decided to evaluate the condition of a main water pipeline. Non-destructive testing (NDT) investigations revealed that certain sections of the pipe were potentially deficient due to corrosion and breakage of the prestressing system. Strengthening of deficient sections was necessary to maintain the pipeline operational. A carbon fiber in-situ lining appeared to be the fastest, least disruptive, and most cost-effective upgrade solution. The specialty concrete repair contractor conducted full-scale tests to validate optimum FRP repair and waterstop termination design. In these tests, after the carbon fiber liner was installed, the prestressing strands of the FRPstrengthened section were cut leaving the FRP to be the only reinforcement. The test pipe was progressively pressurized until failure occurred at approximately 2-1/2 times the pipe service and surge pressures. The full-scale test proved the integrity of the system beyond theoretical prediction and assured the owner that strength was added to the pipe sections. The lightweight, flexible carbon fiber material along with thorough planning helped overcome challenging working conditions and provided a fast and effective upgrade solution.

DOI:

10.14359/12876


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