Effect of ultra-low temperature on flexural behavior of ultra-high toughness cementitious composites

被引：0
|
作者：
Su J. [1 ,2 ]
Qian W. [1 ]
机构：
[1] School of Civil Engineering and Environment, Hubei University of Technology, Wuhan
[2] Hubei University of Technology Engineering and Technology College, Hubei University of Technology, Wuhan
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2022年 / 39卷 / 06期
关键词：
Bending strength; Fiber content; Toughness; Ultra-high toughness cementitious composites; Ultra-low temperature;
D O I：
10.13801/j.cnki.fhclxb.20210823.001
中图分类号：
学科分类号：
摘要：
As a new type of composite material with good mechanical properties and durability, the flexural toughness of ultra-high toughness cementitious composites (UHTCC) is an important indicator to evaluate its mechanical properties. To explore the bending performance of UHTCC materials under an ultra-low temperature environment, five groups of UHTCC materials with different fiber contents were designed. After cryogenic treatment, four-point bending tests were carried out, and the equivalent strength was analyzed. A toughness evaluation method suitable for ultra-low temperature was proposed, which provided the theoretical basis and technical support for the wide application of UHTCC in the field of ultra-low temperature. The results show that the flexural strength of UHTCC increases significantly after ultra-low temperatures. When the temperature decreases to −160℃, the flexural strength of UHTCC increases by 67.67%, but it shows obvious brittleness. In an ultra-low temperature environment, the strength and toughness of UHTCC with 1.5vol% volume fraction are the best, but the performance of UHTCC is slightly reduced after exceeding the optimal volume fraction. Copyright ©2022 Acta Materiae Compositae Sinica. All rights reserved.
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页码：2844 / 2854
页数：10
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