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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 11 Abstracts search results
Document:
SP74
Date:
August 1, 1982
Author(s):
Editor: David R. Lankard / Sponsored by: ACI Committee 547
Publication:
Symposium Papers
Volume:
74
Abstract:
Proceedings of the second ACI sponsored Refractory Concrete Symposium. Ten papers are presented. Topics include recent advances in refractory concrete technology; problems and solutions in using these materials as liners in coal gasification equipment, aluminum melting and holding, refining and petrochemical operations, and steelmaking; nondestructive testing and evaluation; and repair techniques. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP74
DOI:
10.14359/14126
SP74-01
Wate T. Bakker
Recent research on refractory concretes for use in energy conversion applications has provided data, useful in other areas. It is shown that refractory concretes, especially those containing a calcined fireclay aggregate, are very tolerant to environments, generally considered corrosive, such as gases containing CO, CO2, H2, H2S and steam at high pressures. Even when the hydrated calcium aluminates are decomposed and some of the CaO is leached out, are fractory with acceptable physical properties remains. In many cases the strength of the material increases during service. Improved design methods for refractory concrete were also developed. A computer program to calculate heat losses from refractory concrete lined pressure vessels was developed and experimentally verified. This model takes into account the effect of cracks, anchor spacing and different gases in the pores of the concrete. The thermo mechanical behavior of refractory concrete was studied experimentally and modeled by computer. Design and materials selection criteria were developed. To minimize cracking, shrinkage and creep of the concrete should be low, preferably less than 0.1%. Anchor spacing should be wide and the anchors coated with a compliant or combustible material to avoid stress concentrations. Bond barriers between the vessel shell and the refractory and between various refractory layers are also beneficial. Long holding periods during initial heat up of the lining were found superfluous.
10.14359/6390
SP74-09
Robert E. Fisher
Early failures of monolithics are always a disheartening experience to the supplier, but they often are useful learning experiences as well. A number of field problems are described. These problems were solved by such adjustments as changes in material selection, improvements in existing materials and/or the development of new materials, changes in design, improvements in installation technique and modifications to the bake out procedure.
10.14359/6398
SP74-06
Wesley C. Lueking
Plastic refractories fail from anyone of five general causes. One of these is improper installation. A case history is presented of a large monolithic job where several fundamentals of installation were not followed and subsequent replacement was required.
10.14359/6395
SP74-04
Timothy J. Fowler
American Concrete Institute Committee 547 has introduced the concept of rational design based on a comprehensive analysis of the stress and strain fields. The approach utilizes recently developed thermal and stress analysis techniques to predict the service performance and life of a refractory. With this knowledge, a more optimum design can be developed, and design for a specific life is feasible. Current design practice is often based on relative material properties, and trial and error design techniques. While satisfactory for many situations, this approach breaks down when a background of experience is not available. The rational design approach provides insight into the behavior of the refractory and can be applied to the overall refractory system, or to small isolated components. The analytical techniques are relatively new and the application to refractory is still in its infancy. Successful use of rational design techniques will result in reduced initial cost, savings of downtime, and improved performance. Considerable research and development work is required to refine, simplify, and apply this new design approach, and to develop the required engineering data.
10.14359/6393
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