Experimental research on fire resistance behavior of full-scale TRC self-thermal insulation sandwich wall structures
Experimental research on fire resistance behavior of full-scale TRC self-thermal insulation sandwich wall structures
复制标题
含有 TRC 的短切纤维在高温下的弯曲行为
DOI：
10.1016/j.conbuildmat.2020.120562
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发表时间：
2020
影响因子：
0.9
通讯作者：
Godwin Amoako-Atta
中科院分区：
文献类型：
--
作者：
linghua shen;jiyang wang;shilang xu;Godwin Amoako-Atta
本文测定了不同体积含量的钢、碳和玄武岩短切纤维（即，0.0%、0.5%和1.0%）对高温处理后纤维网增强混凝土（TRC）抗弯性能的影响。通过四点弯曲试验，研究了不同短切纤维掺量的TRC试件在室温下以及经过0.5 h、0.75 h和1.0 h高温后的刚度、变形和极限承载力。结果表明，在基体中加入短切纤维对极限载荷有积极的影响，尤其是对于表现出优异性能的短切碳纤维。对于短切钢纤维和碳纤维，极限载荷随着纤维含量的增加而提高，但对于高温处理后的短切玄武岩纤维，情况并非如此。此外，还进行了扫描电子显微镜和α射线光谱分析，这使得能够在所需的高温处理后对样本的受损部分进行分析。研究发现，经过高温处理后，短切纤维的不同表面发生了明显的变化，这间接表明这些试样的力学行为与短切纤维的特性密切相关（即，直径和表面特性）和相应的基质流动性。
This paper determined the influence of chopped fibers made of steel, carbon and basalt with different volume contents (i.e., 0.0%, 0.5% and 1.0%) on the flexural behavior of textile reinforced concrete (TRC) after high-temperature treatment. Four-point bending tests were conducted to study the stiffness, deformation, and ultimate load of TRC specimens with different chopped fibers at room temperature and after the required high-temperature time of 0.5 h, 0.75 h and 1.0 h. The results showed that adding chopped fibers to the matrix had a positive effect on the ultimate load; this was especially true for the chopped carbon fibers that exhibited excellent performance. For chopped steel and carbon fibers, the ultimate load improved as the fiber content increased, but this was not the case for chopped basalt fibers after high-temperature treatment. Moreover, scanning electron microscopy and alpha ray spectrometry were conducted, which enabled analysis of the damaged sections of the specimens after the required high-temperature treatments. It was found that different surfaces of chopped fibers obviously changed after high-temperature treatment, which indirectly indicated the mechanical behavior of these specimens was closely related to the characteristics of chopped fibers (i.e., the diameter and surface characteristics) and the corresponding fluidity of the matrix.