纤维混凝土高温力学机理综述

摘要

It introduces the research background of fiber concrete and the theoretical basis of strengthening mechanism,then expounds the mechanism of pore water pressure theory,thermal stress theory and thermal cracking theory,and illustrates the high temperature burst mechanisms of three kinds of fiber concrete.Finally,it concludes that the theory of pore water pressure is more convincing in explaining the high temperature burst of fiber concrete,and it is clear that the condition of high temperature burst in concrete is more important.However, the stability of the strength of fiber reinforced concrete and the study of the durability of the substrate are very few.%先介绍了纤维混凝土的研究背景及增强机理的理论依据,然后依次阐述了孔隙水压力学说、热应力学说和热开裂学说三类纤维混凝土的高温爆裂机理并举例说明,最后得出结论:孔隙水压力学说在解释纤维混凝土高温爆裂的原因,明确混凝土发生高温爆裂的条件等方面更具有信服力;目前对纤维混凝土高温力学性能的研究多侧重于利用纤维提高混凝土基体强度,但对纤维混凝土高温下其强度稳定性以及基体耐久性的研究甚少等结论.