Study on the dispersibility of modified basalt fiber and its influence on the mechanical properties of concrete
Study on the dispersibility of modified basalt fiber and its influence on the mechanical properties of concrete
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DOI：
10.1016/j.conbuildmat.2022.128839
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发表时间：
2022-08-20
影响因子：
7.4
通讯作者：
Li, Y.
中科院分区：
文献类型：
--
作者：
Deng, Y. G.;Zhao, B. J.;Li, Y.
为改善玄武岩纤维在混凝土中的分散性能，采用盐酸溶液对其进行表面改性。采用响应面法和切面图像分析技术，通过分散度试验定量评价了纤维的分布特征。此外，还研究了改性玄武岩纤维对混凝土力学性能的影响。结果表明，玄武岩纤维经盐酸溶液改性后，表面粗糙度增加，韧性没有明显下降。当盐酸浓度为4 mol/L、改性时间为15 h、改性温度为50 ℃时，纤维在水泥浆体中的分散度达到84%，在硬化混凝土基体中的分散系数达到0.9。改性玄武岩纤维增强混凝土的劈拉强度和弯曲强度均有所提高。与未处理的玄武岩纤维混凝土相比，养护28天后，玄武岩纤维混凝土的劈拉强度和弯曲强度均有所提高。掺改性纤维混凝土的拉拔荷载、平均粘结强度和拉拔功分别比掺纯纤维混凝土提高了128%、129%和71%。盐酸溶液表面改性法在玄武岩纤维混凝土的大规模生产中显示出巨大的潜力。
With the aim of improving the dispersion property of basalt fibers in concrete, its surface was modified using hydrochloric acid (HCl) solution. The distribution characteristics of fiber were quantitatively evaluated by the dispersal degree test with response surface method and cutting plane image analysis technique. Besides, the effect of modified basalt fiber on the mechanical properties of concrete was investigated. The results show that the surface roughness of basalt fiber was increased, the toughness of the fiber did not significantly degrade after being modified by the hydrochloric acid solution. When the concentration of hydrochloric acid was 4 mol/L, the modification time was 15 h and the modification temperature was 50 ?, the fiber dispersion degree in cement suspension paste reached 84%, the fiber dispersion coefficient reached a higher level of 0.9 in the harden concrete matrix. The splitting tensile and flexural strength of modified basalt fiber-reinforced concrete are improved. In contrast to untreated basalt fiber-reinforced concrete, a higher splitting tensile strength and greater flexural strength were obtained after curing for 28 days. Furthermore, the pull-out load, average bond strength and pull-out work of concrete with modified fiber were 128%, 129% and 71% higher than concrete with neat fiber. Surface modification method by HCl solution demonstrates great potential for large scale production of basalt fiber-reinforced concrete.