Thermal curing of fibre-reinforced UHPC

在提出的研究项目框架内，将系统地研究养护对纤维增强超高性能混凝土性能的影响。除了目前常用的90°C热处理外，还将采用更高温度下的热固化和热压固化(高压灭菌)。因此，在正常硬化条件下反应较少或几乎不起作用的起始材料将被相当程度地激活，从而在很大程度上影响材料的微观结构，从而影响材料的性能。研究的目的是通过控制养护条件(温度、压力和时间)来改善超高性能混凝土的性能。为了实现这一目标，有必要获得关于热处理和蒸压胶凝体系中各相的形成和稳定性的基本知识。为此，主要通过应用不同的养护条件来改变相组合，并考虑纤维粘结来评价其对超高性能混凝土力学性能的影响。

In the frame of the proposed research project the influence of curing on the properties of fibre-reinforced UHPC is to be investigated systematically. Besides the heat treatment at 90°C commonly used today, heat curing and heat-pressure curing (autoclaving) at significantly higher temperatures will be applied. Thus, starting materials, which are less or barely reactive under normal hardening conditions, will be activated considerably, influencing to a great extent the micro structure and consequently the performance of the material. The goal of the investigations is improve the properties of UHPC by controlling the curing conditions (temperature, pressure and duration). In order to attain this goal it is necessary to obtain fundamental knowledge of the formation and the stability of the phases in the heat treated and autoclaved cementitious system. For this purpose the phase assemblage is varied mainly by application of different curing conditions and its influence on the mechanical properties of the UHPC is evaluated considering the fibre bond.