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For ordinary concrete, the creep coefficient can reach 3-4; for high-performance concrete, this is reduced but the recorded deformation remains higher than the elastic deformation.The creep coefficient of Ductal® is less than 0.8, and if a heat treatment is applied, the creep factor is less than 0.2, as shown in the figure below.This data provides no guarantee or commitment that the values will be achieved in any particular application of Ductal®.Ductal® is a registered trademark and may not be used without permission.
Stress curve – deformation for a sample of Ductal® with metallic fibers.
The ultra-high performance material that is Ductal® and its various components are protected by various patents and may not be used except pursuant to the terms of a license agreement with the patent holder." The values above are for guidance only and cannot be used as technical design specifications.
They depend on the product characteristics, experimentation method, raw materials, formulas, manufacturing procedures and equipment used; all of which may vary.
The fibers give the material a ductile behavior during bending (i.e., when loaded in flexure behond the elastic limit, micro-cracks occur and the fibers hold the cracks tightly closed, providing a ductile performance rather than a sudden or brittle failure) as shown in the following graph.
The ductility behavior observed during bending is characterized by a multiple cracks before the stress peaks, without localization and without the presence of any major cracks.