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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 17 Abstracts search results
Document:
SP231-06
Date:
October 1, 2005
Author(s):
C. Walker
Publication:
Symposium Papers
Volume:
231
Abstract:
This paper relates the historical development and use of single strandunbonded post-tensioning tendons in parking structures constructed in deicing saltregions in North America since the early 1960’s. These parking structures wereconstructed in southeast Canada and the northeastern and midwestern United Statesusing wire and strand tendons as the primary flexural reinforcing and were exposed todeicing salts during the winter. Parking structures exposed to ocean salts have notbeen reviewed. Most of the following discussion, however, will also apply to them.
DOI:
10.14359/14922
SP231-15
H.R. Hamilton III, T. Labonte, and M.H. Ansley
Self-consolidating concrete (SCC) is a relatively new approach to makingconcrete and is characterized by its high flowability and resistance to aggregatesegregation in the plastic state. SCC has become a popular alternative for commercialprecast elements and is being evaluated for use in precast bridge girders. This paperoutlines structural testing of six precast, pretensioned, AASHTO Type II girders. Threewere constructed using SCC, and three using a conventional mix. The major tasksincluded performing plastic and hardened property tests, constructing SCC beamswithout vibrating, determining the prestress transfer length, monitoring the camber,and finally testing the beams in such a manner as to produce flexure and sheardominated failure modes. Results of the construction and testing are presented.
10.14359/14931
SP231-04
W.N. Marianos, Jr.
The growth of prestressed concrete development in the United States wasgreatly influenced by the publications available to practicing engineers. A number ofthe early books and publications on prestressed concrete are reviewed and discussedin this paper. Pioneers of prestressed concrete development are viewed through theirpublications and the role they played in promoting prestressing. Two key conferences(in 1951 and 1957) are also considered. Figures include samples of important passagesfrom the texts considered. Through all of these, some of the flavor and personalities ofthis important period can be experienced.
10.14359/14920
SP231-08
P.R. Gupta
Friction losses contribute about 50% of the total losses in post-tensionedconstruction. The original loss coefficients that were derived for earlier post-tensioningsystems are still being used in the ACI recommendations for unbonded construction.Some of these systems have not been used in the industry for almost 30 years.This paper presents a review of the current ACI recommendations of friction losses inunbonded construction. The paper also describes the theoretical development of asimple field technique to determine the curvature and wobble coefficients under fieldconditions. Results from initial testing are compared with the ACI recommendations andindustry practice.
10.14359/14924
SP231-01
L.R. Taerwe
In the early 1940’s Prof. G. Magnel performed extensive researchprogrammes on real scale prestressed concrete beams at Ghent University (Belgium) inorder to elaborate design methods for this new material. He also developed his ownanchorage system which was used until the mid 60’s in Belgium. He gave manylectures in several countries in which he explained in a simple way the principles ofprestressed concrete. He was also instrumental in the design of the first prestressedconcrete bridge in the USA, the Walnut Lane Bridge in Philadelphia and he was theauthor of the first English textbook on prestressed concrete. He designed one of thefirst PC railway bridges in Europe and the first statically indeterminate PC bridge in theworld. In the 1950’s many engineers from abroad spent some time in Magnels lab inGhent to perform research and to get acquainted with practical realizations.
10.14359/14917
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