Flexural Behaviour and Constitutive Correlation of UHPC at Cryogenic Temperatures
AI Jinhua
HE Bei
ZHANG Yi
ZHANG Hongen
JIANG Zhengwu
Abstract：The flexural mechanical behavior of ultra-high performance concrete(UHPC)at different temperatures was studied.The brittle failure evolution mechanism of UHPC was characterized with energy absorption efficiency,acoustic emission energy release rate and ring-down count.Three flexural constitutive models of UHPC were established.The results show that when the temperaure is-170℃,the first-peak and maximum flexural strength of UHPC increase from 10.6,20.9 MPa at 20℃to 21.1,42.5 MPa,respectively.Within the range of 20--170℃,with the decrease of temperature,the brittleness of UHPC firstly increases and then decreases,showing the minimum brittleness at-80℃and the maximum brittleness at-170℃,respectively.Compared to the constitutive models of Prof.Guo Zhenhai and Dr.Wu Zemei,the linear-nonlinear constitutive model has the highest prediction accuracy and the lowest data variability.
Keywords：ultra-high performance concrete(UHPC)flexural strengthcryogenic temperaturebrittlenessconstitutive correlation
Publication Date：2024-01-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 23-29 )