超低温作用对超高韧性水泥基复合材料抗弯性能的影响  

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

作　　者：苏骏 钱维民 SU Jun;QIAN Weimin(School of Civil Engineering and Environment,Hubei University of Technology,Wuhan 430068,China;Hubei University of Technology Engineering and Technology College,Hubei University of Technology,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,武汉430068 [2]湖北工业大学工程技术学院,武汉430068

出　　处：《复合材料学报》2022年第6期2844-2854,共11页Acta Materiae Compositae Sinica

基　　金：湖北省自然科学基金(2020CFB860)。

摘　　要：超高韧性水泥基复合材料(UHTCC)作为一种具有良好力学性能和耐久性能的新型复合材料,弯曲韧性是评价其力学性能的重要指标。为探究UHTCC材料在超低温环境下的抗弯性能,设计了5组不同纤维体积掺量的UHTCC新材料,经过深冷处理后进行四点弯曲试验,对其进行等效强度分析,提出一种适用于超低温作用后的韧性评价方式,为UHTCC在超低温领域的广泛应用提供理论基础和技术支持。研究结果表明:超低温作用后UHTCC的弯拉强度显著提升,当温度降低至−160℃,UHTCC的弯拉强度最大可提升67.67%,但表现出明显的脆性;超低温环境下1.5vol%UHTCC的强度及韧性性能提升效果最佳,但超出最优掺量后,UHTCC的性能反而略微降低。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,fourpoint 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.

关 键 词：超高韧性水泥基复合材料 超低温 弯拉强度 抗弯韧性 纤维掺量 

分 类 号：TB332[一般工业技术—材料科学与工程]