International Concrete Abstracts Portal

Showing 1-5 of 238 Abstracts search results

Document: 

CI4604Britt_spotlight

Date: 

April 1, 2024

Author(s):

Jennifer Britt

Publication:

Concrete International

Volume:

46

Issue:

4

Abstract:

Existing concrete slabs and structures require scanning and imaging before any build out, renovation, or excavation work begins. Ground-penetrating radar technology has established itself as the primary tool for fast, effective, and efficient determination of the presence of utilities and embedded structural members, such as post-tensioning tendons and reinforcing bars.


Document: 

CI4601Klinger

Date: 

January 1, 2024

Author(s):

James Klinger, Joseph F. Neuber Jr., Jeffrey Ondo, and Bruce A. Suprenant

Publication:

Concrete International

Volume:

46

Issue:

1

Abstract:

Placing and finishing of concrete slabs with portland-limestone cement (Type IL cement) may create issues for some contractors, and bleeding rate is a major factor. The article discusses saw cutting, cold weather protection, post-tensioning, and form removal, as well as best practices and strategies to minimize risks during floor slab finishing and early-age, strength-critical construction with Type IL cement.


Document: 

CI4510Weilacher

Date: 

September 29, 2023

Author(s):

Weilacher, R.M.; Newsome, J.; and Harrison, G.H.

Publication:

Concrete International

Volume:

45

Issue:

10

Abstract:

Riverworks at Eastern Wharf is a mixed-use development in Savannah, GA, USA. A massive fire at the construction site caused severe damage to this project. The article describes the investigation of the structure’s condition after the fire, damage evaluation, and repair of the concrete structure of the podium slab and post-tensioning cables.


Document: 

CI4306Reigstad

Date: 

June 1, 2021

Author(s):

Gordon H. Reigstad, Jason G. Reigstad, and Jared M. Reigstad

Publication:

Concrete International

Volume:

43

Issue:

6

Abstract:

Volume change is a challenging aspect of reinforced concrete and post-tensioned construction. If no measures are taken to minimize restraint to shortening from columns, braced frames, moment frames, and shear walls, strains resulting from concrete shrinkage, creep, temperature, and elastic shortening associated with post-tensioning can result in high tensile stresses and significant cracking. In an elevated slab, the common solution is to use a pour strip. An innovative pour strip design based on the use of mechanical couplers is discussed.


Document: 

SP-333_07

Date: 

October 1, 2019

Author(s):

Martin Herbrand, Viviane Adam, Josef Hegger

Publication:

Symposium Papers

Volume:

333

Abstract:

Due to increased traffic loads and changes in the code provisions many highway bridges in Germany exhibit deficits in shear capacity according to current codes. The majority of these bridges’ structures comprises continuous concrete beams whose calculatory shear capacity is often exceeded by now. However, the actual shear capacity of prestressed concrete continuous beams is usually underestimated since the design procedures have been derived on the basis of single-span beam tests and neglect significant shear transfer mechanisms. In order to extend the service life of existing bridges, the reserves in the design procedures can be partially taken advantage of by the application of refined design approaches. For this reason, five shear tests on prestressed concrete continuous beams have been performed at the Institute of Structural Concrete of RWTH Aachen University in Germany. Within these tests, the influence of cross-section type (rectangular and I-shaped cross-section), load distribution (concentrated and distributed loads) and the shear reinforcement ratio are investigated. In this paper, the test results of three beams under concentrated loads will be presented.

DOI:

10.14359/51720273


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