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该文将短切钢纤维掺入纤维编织网增强混凝土(TRC)薄板中,通过四点弯曲试验,比较了短切钢纤维的长径比和掺量对TRC薄板常温下及高温后弯曲性能的影响。高温处理采用可实现程序控温的高温炉,按ISO834国际标准升温曲线进行加热,高温处理时间为0.5 h或1.0 h。结果表明,外掺钢纤维有助于提高TRC薄板常温下的承载力和初裂后刚度,钢纤维长径比对TRC薄板的承载力和变形能力影响不大,钢纤维掺量为1.0%的TRC薄板承载力提高了61%。随着高温作用时间变长,TRC薄板承载力大幅下降,连续贯穿裂缝数目大量减少,1.0 h高温后几乎丧失多缝开裂的破坏特征。无论在常温下或高温处理后,钢纤维体积掺量1.0%的TRC薄板均具有相对较好的力学性能。
In this paper, short-cut steel fiber is incorporated into the fiber reinforced concrete (TRC) sheet. The four-point bending test is used to compare the aspect ratio of the chopped steel fiber with the bending strength of the TRC sheet after room temperature and high temperature influences. High temperature treatment can be used to achieve high temperature furnace temperature control procedures, according to ISO834 international standard curve heating temperature, high temperature treatment time of 0.5 h or 1.0 h. The results show that the addition of steel fiber can improve the bearing capacity and initial stiffness of TRC sheet at room temperature. The ratio of the length to diameter of steel has little effect on the bearing capacity and the deformation capacity of the TRC sheet. The steel fiber content is 1.0% TRC sheet bearing capacity increased by 61%. With the action of high temperature for a long time, the bearing capacity of TRC sheet decreased significantly, and the number of continuous cracks decreased greatly. After several hours of high temperature, the failure characteristics of multi-slit cracking were almost lost. No matter at room temperature or high temperature treatment, the volume fraction of steel fiber 1.0% TRC sheet has relatively good mechanical properties.