Journal article
Regenerated cellulosic fibers to enhance the stability under cyclic thermal stress



Publication Details
Authors:
Scheffler, B.; Wetzel, A.; Sälzer, P.; Middendorf, B.
Publisher:
ERNST & SOHN
Publication year:
2019
Journal:
Beton- und Stahlbetonbau / Concrete and Reinforced Concrete Structures
Pages range:
674-682
Volume number:
114
Issue number:
9
Start page:
674
End page:
682
Number of pages:
9
ISSN:
0005-9900

Abstract
In recent years, the use of high-performance concrete increased. For the practical application of Ultra-High Performance Concrete (UHPC), not only load-bearing capacity and durability requirements exist, but there is also a demand on fire protection. Characteristic data for the thermal and mechanical behavior of UHPC under fire impact already exist. Due to the very dense microstructure of UHPC, almost free of capillary pores, temperature loads larger than 250 degrees C lead to a damage of the structure and furthermore to failure due to explosive spalling, which is not predictable. In case of fire, the temperature effects are much higher than this and cyclic loadings are not relevant. In contrast to this, a concrete is required as construction material in industrial areas, such as power plant and chimney construction as well as application for special mechanical engineering, which can withstand a permanent and cyclic thermal load of up to 500 degrees C. The results presented here describe the material behavior of existing and optimized UHPC formulations under different thermal load profiles. The properties of the hardened concrete were characterized before and after thermal loading. Since the basic formulation of the UHPC was thermally stable only up to a certain temperature level, it was optimized by adding regenerated cellulosic fibers to avoid explosive spalling and to thermally stabilize the concrete respectively.

Last updated on 2019-04-12 at 10:49