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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 12 Abstracts search results
June 1, 1986
Editor: T.Z. Harmathy
This publication is a compilation of 11 papers dealing exclusively with the analysis and repairability of concrete damaged in building fires. Due to the importance of concrete and its role in the structural performance of modern buildings, the ability to deal with fire-damaged concrete is a central issue. This symposium volume combines the knowledge and experience of fire safety experts from around the world. The topics covered include the following: experience of fires in concrete structures; fires during nuclear power plant construction; assessment and repair of fire-damaged concrete; residual properties of concrete heated rapidly; and residual strength of fire-exposed reinforced concrete columns. Evaluation and Repair of Fire Damage to Concrete will give the reader substantial insight into both the problems and solutions associated with concrete which has been exposed to high temperatures.
T T. Lie, T. J. Rowe, and T. D. Lin
A study was carried out to assess the residual strength of reinforced concrete columns after exposure to a standard fire for various lengths of time, and cooling. The use of a mathematical model, an ultrasonic pulse test method and a load test method are investigated. Calculated temperatures and residual strengths of test columns were compared with those measured. Comparisons were also made between calculated and measured pulse velocities. The results indicated that using the calculation procedure and the method of measuring pulse velocity described in the study, the residual strength of concrete columns can be assessed with an accuracy sufficient for practical purposes.
A. K. Tovey and R. N. Crook
This paper outlines the procedures adopted in obtaining information on fire-damaged concrete structures since 1975. Details are given on the information received from questionnaires and a summary of the building and construction types, damage and repairs are tabulated. The general conclusion is that concrete structures behave well under fire conditions with the majority of cases being repairable.
K. Kordina, W. Wydra, and C. Ehm
Experiments were carried out ith measurements of the total defo ission in order to investigate the evelopment and deformation behavio y temperature conditions.S purpose specimens were loaded wi th different stress le- on normal concrete specirmation and of the acou-correlation between ur of concrete during vels and heated up to maximum temperatures between 150 "C and 750 OC. After a holding period the specimens were cooled under load. The creep deformations showed strongly increasing rates at about 450 OC during heating and at the beginning of the cooling phase. , In the heating phase the activity of acoustic emissions increased considerably. During the holding period no remarkable activity e observed. A new increase of the acoustic activity could rly observed at the beginning of the cooling phase. rmal concrete specimen, the main a.ctivity in the damaging occurs during unsteady temperature conditions, and is nt on the maximum temperature reac hed. parison between acoustic emission activity and creep de-formations shows that the acoustic emission activities are high at e time that creep deformations areI high.
A major three span highway bridge in Southern Ontario was 1nvYived in a construction fire while it was being widened 25 years ago. Concrete, ranging in age from 6 days to 20 years, in an abutment, the adjacent arch rings and spandrel columns was severely damaged. The structure is now revisited to assess the long term performance of the remedial works and to consider whether the investigation and repairs might have taken a different course if today's testing, analytical and repair techniques had been available then. The strengthening of the damaged arch springings and the shotcrete restored concrete sections exposed to a harsh environment have stood the test of time. The review of investigative and repair methods identifies advances made in recent years, and justifies long term confidence in o'lder procedures which are still in use.
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