碳纤维长度对CFRC力学性能影响试验研究

Experimental study of mechanical behavior of carbon fiber reinforced concrete under different length of carbon fiber

为了进一步研究碳纤维长度对混凝土力学性能的改善效果,确定碳纤维混凝土(CFRC)中纤维的最佳长度。基于试验研究了四种不同长度的碳纤维对混凝土的增强效果,得到不同长度碳纤维对混凝土抗压强度的影响曲线,不同碳纤维长度的试块的荷载与变形曲线;在加载过程中,不同碳纤维长度试块的横向应变和纵向应变的比值随荷载的变化曲线。试验结果表明:随着纤维长度的增加,抗压强度先增加后降低,纤维长度为10 mm时,其提高较为明显,并且长度为10 mm的纤维可以有效地改善混凝土的脆性破坏,当长度超过30 mm时,纤维对混凝土的变形改善效果不明显。

To further study the mechanical properties of carbon fiber reinforced concrete （ CFRC ） about carbon fiber length, and determine the optimum length of the fiber.Based on the test, the enhancement effect of four different length of carbon fiber reinforced concrete was studied.Compressive strength curves and load-deformation curves of the test blocks mixing the different lengths carbon fiber were obtained.In the loading process, the change curve of the ratio of transverse strain and longitudinal strain were obtained.The results showed that the compressive strength increase and after decrease with the increase of fiber length.When the length of carbon fiber was 10 mm, the improved effect was best, and it can effectively improve the brittle failure of concrete.When the length of carbon fiber is more 30 mm, the improved effect of deformation of carbon fiber reinforced concrete is not obvious.