Standards Development

Scope

This International Standard specifies a test method for determining the compressive strength of refractory products at elevated temperature, including definitions, principle, apparatus, test piece, procedures and calculation. This standard also could be used for determining the compressive strength of carbon containing refractory products at elevated temperature in a closed furnace at reducing atmosphere. This test method may be used for materials development, quality control, characterization and design data-generation purposes.

Purpose

One of the most significant characteristic of the service conditions for refractory materials is the
coupling of high temperature and mechanical load. Compressive stress is the important and general
stress for refractories.
Sintered refractories have certain compressive strength before use. During service lifetime, their
bearing capacity of compressive stress may remarkely change with the temperature up to failure. For
unshaped refractories, such as refractory castables always have lower early stage strength. Their
strength even may present a big fluctuation with increasing temperature influenced by the different
binders. There even exists the so-called “lowest-strength zone” in certain temperature range.
In order to ensure sufficient compressive stress bearing capacity, it is very essential to determine the
compressive strength at elevated temperature for refractories and give important information to the
development of new products, the improvement of materials design as well as the safety insurance of
the industry instruments.
However, there exists only the standard of the test method for the compressive strength at room
temperature in International Standardization System till now, which is not able to characterize the
mechanical properties of refractory products under service conditions. The test method for evaluating
the refractoriness under load and compressive creep at elevated temperature are already existed in
International Standardization System.
However, the abovementioned methods cannot offer the information of ultimate compressive stress at
elevated temperature, which is badly needed for refractory producers and customers. The standard will
provide an approach to obtain the deformation behavior and compressive strength at elevated
temperature under compressive load. The obtained information can be used to guide the thermomechanical
behaviour simulation, the development of new materials, the quality evaluation and the
selection of suitable materials for specified applications. It is beneficial for improving the product quality
and ensuring the safety of industrial high-temperature furnaces.
Wuhan University of Science and Technology had carried out the research work on compressive
strength measurement since 2007, Lot of results concerning about the compressive strength of
refractory products at elevated temperature have been achieved, a Chinese patent on instrument and
test method of compressive strength measurement at high temperature has been granted. Based on
the research results, working group (WG29) of this aforementioned standard project was established
during the meeting hold by ISO/TC33 in Aachen, Germany, 2017. The latest research results were
discussed with experts during the meeting hold by ISO/TC33 in Hangzhou, China, 2018. The
experimental programs are improved according to the comments raised by experts. Till now,
experimental details and the experimental data of Alumina silica brick (typical non-basic refractories)
and magnesia refractories (typical basic refractories) were obtained. Besides, the draft Standard was
accomplished. According to the achieved results, the project has already gained good foundation and
can be finished within 3 years.
Consider the following:
Is there a verified market need for the proposal?
What problem does this document solve?
What value will the document bring to end-users?

See Annex C of the ISO/IEC Directives part 1 for more information.
See the following guidance on justification statements in the brochure ‘Guidance on New work’: https:
//www.iso.org/publication/PUB100438.html