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International Concrete Abstracts Portal

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


Document: 

SP74-09

Date: 

August 1, 1982

Author(s):

Robert E. Fisher

Publication:

Symposium Papers

Volume:

74

Abstract:

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.

DOI:

10.14359/6398


Document: 

SP74-06

Date: 

August 1, 1982

Author(s):

Wesley C. Lueking

Publication:

Symposium Papers

Volume:

74

Abstract:

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.

DOI:

10.14359/6395


Document: 

SP74-10

Date: 

August 1, 1982

Author(s):

I. Leon Glassgold

Publication:

Symposium Papers

Volume:

74

Abstract:

The introduction describes the types of materials used in refractory linings, their constituent ingredients and general properties. A brief history is presented with the problems and procedures attendant to the installation and use of various refractory materials. This is followed by an analysis of failure mechanisms with an overview of repair methods, including a description of available hot and cold techniques for the various repair alternatives. The need for careful surface preparation is emphasized, while anchoring and bonding devices are described. Choosing the appropriate repair material is also highlighted. Miscellaneous details covering joints, curing, drying and heatup and their importance in achieving a successful repair are discussed. A detailed description of proper repair procedures, including shotcreting, casting and guncasting, among others, is presented with particular emphasis being placed on the methods available for both plastic and castable requirements. Qua1ity Contro1 of the entire repair procedure and the methods of testing in use at present are assessed.

DOI:

10.14359/17463


Document: 

SP74-01

Date: 

August 1, 1982

Author(s):

Wate T. Bakker

Publication:

Symposium Papers

Volume:

74

Abstract:

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.

DOI:

10.14359/6390


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