In the fire safety part of Eurocode 2, material properties for conventional concrete (CC) up to a strength class of C 50/60 and high performance concrete (HPC) of strength classes C 55/67 to C 90/105 are provided. These given values were derived from experimental investigations of heated components based on the thermal exposure of the ISO 834 standard fire. Ultra-high performance concrete (UHPC) has not been standardized yet.

While the ISO 834 standard fire is only characterized by a heating phase, a natural fire consists of a heating and a cooling phase.

In this paper, the investigation of the thermal and thermo-mechanical material properties of UHPC, considering natural fires, is presented. The thermal properties, including the heat conductivity, the specific heat capacity and the temperature-dependent density as well as the mechanical properties like the temperature dependent stress-strain-relation were experimentally determined. In addition for validation purpose, real-scale experiments on columns were carried out.

在欧洲规范 2 的消防安全部分，提供了强度等级为 C 50/60 的常规混凝土 (CC) 和强度等级为 C 55/67 至 C 90/105 的高性能混凝土 (HPC) 的材料特性。这些给定值来自基于 ISO 834 标准火灾的热暴露对加热组件的实验研究。超高性能混凝土 (UHPC) 尚未标准化。

ISO 834 标准火灾仅以加热阶段为特征，而自然火灾由加热和冷却阶段组成。

在本文中，介绍了考虑自然火灾的 UHPC 的热和热机械材料特性的研究。通过实验确定了热性能，包括热导率、比热容和温度相关密度以及机械性能，如温度相关应力应变关系。此外，出于验证目的，还在色谱柱上进行了实际规模的实验。