(内蒙古农业大学水利与土木建筑工程学院， 呼和浩特 010018)

［摘要］通过对碳纤维的体积掺量分别为0，0.3%，0.6%，0.9%，1.2%，1.5%的轻骨料混凝土进行3，7，14，28d混凝土立方体抗压强度试验和劈裂抗拉试验，分析了碳纤维的掺入对混凝土力学性能的影响；利用环境扫描电镜试验观测碳纤维与混凝土界面的粘结关系；利用Rapid Air 457分析仪测定混凝土内部的气孔结构，再结合灰色关联度分析，探讨混凝土微观气孔结构与宏观力学性能的关系。试验表明：当碳纤维的体积掺量为0.3%时，混凝土的力学性能达到最优，抗压强度提高了10.28%；碳纤维的掺入可以细化混凝土内部的气孔结构，使含气量降低了11.59%，超大孔隙和大孔隙的频率分别降低了13.63%和13.47%；在气孔结构参数中气泡的平均弦长是影响混凝土强度的最主要因素。 

［关键词］轻骨料混凝土； 碳纤维； 力学性能； 环境扫描电镜； 气孔结构； 灰色关联度分析 

中图分类号：TU528-2 文献标识码：A文章编号：1002-848X(2021)11-0108-05

Experimental study on mechanical properties of carbon fiber light-weight aggregate concrete 

YANG  Hong,  WANG  Hailong,  WANG  Hongshan,  SUN  Song,  LIU  Simeng,  WANG  Zi 

(College of Water Conservancy and Civil Construction Engineering， Inner Mongolia Agricultural University， Huhhot 010018， China) 

Abstract: Through the 3, 7, 14, 28d concrete cube compressive strength test and split tensile test of light-weight aggregate concrete with the volume content of carbon fiber of 0, 0.3%, 0.6%, 0.9%, 1.2%, 1.5%, respectively. The influence of the incorporation of carbon fiber on the mechanical properties of concrete was analyzed; and the bonding relationship between carbon fiber and concrete interface was observed by environmental scanning electron microscope test; and the pore structure inside the concrete was measured by the Rapid Air 457 analyzer. Combined with the gray correlation analysis, the relationship between the microscopic pore structure of concrete and the macroscopic mechanical properties was discussed. Experiments show that when the volume content of carbon fiber is 0.3%, the mechanical properties of concrete are optimal, and the compressive strength is increased by 10.28%. The incorporation of carbon fiber can refine the pore structure inside the concrete, the air content is reduced by 11.59%, and the frequencies of super-large pores and macropores are reduced by 13.63% and 13.47%, respectively. The average chord length of the bubbles in the pore structure parameters is the most important factor affecting the strength of concrete.

Keywords:light-weight aggregate concrete； carbon fiber； mechanical property； environmental scanning electron microscope； pore structure； gray correlation degree analysis

*国家自然科学基金项目(51669026，52069024)。

 作者简介：杨虹，硕士研究生，Email：1834427532@qq.com；通信作者：王海龙，博士，教授，博士生导师，Email：nndwhl@126.com。