玄武岩纤维高性能混凝土轴拉和抗冲击韧性试验研究

研究了玄武岩纤维掺量对混凝土轴拉性能和抗冲击韧性的影响,观察了试件拉伸与冲击的破坏形态,测得了试件的轴拉强度、破坏冲击次数等指标。结果表明:随着玄武岩纤维掺量的增加,混凝土的轴拉强度先增大后减少;当玄武岩纤维掺量为5 kg/m³和10 kg/m³时,试件的轴拉强度相比素混凝土的轴拉强度分别提高了24.41%和50.17%;当玄武岩纤维掺量为15 kg/m³时,试件的轴拉强度相比素混凝土的轴拉强度降低了3.73%;各试件的冲击破坏裂缝均出现在试件中部;与素混凝土相比,玄武岩纤维掺量为5 kg/m³和10 kg/m³试件的破坏冲击次数分别增加了46.29%和69.66%,抗冲击韧性的改善效果明显;当玄武岩纤维掺量为15 kg/m³时,由于纤维分散不够均匀,导致试件的破坏冲击次数降低。

Experimental Study on Axial Tensile and Impact Toughness of Basalt Fiber Reinforced High Performance Concrete

The effects of basalt fiber content on the axial tensile properties and impact toughness of concrete were studied.The failure modes of tensile and impact of the specimens were observed,and the tensile strength and failure impact times of the specimens were measured.The results show that the tensile strength of concrete increases first and then decreases with the increase of basalt fiber content.When the content of basalt fiber is 5 kg/m³and 10 kg/m³,the tensile strength of specimens is increased by 24.41%and 50.17%respectively compared with that of plain concrete.When the content of basalt fiber is 15 kg/m³,the tensile strength of the specimen is 3.73%lower than that of plain concrete.The impact failure cracks of each specimen appear in the middle of the specimen.Compared with plain concrete,the failure impact times of specimens with basalt fiber content of 5 kg/m³and 10 kg/m³are increased by 46.29%and 69.66%respectively,and the improvement effect of impact toughness is obvious.When the content of basalt fiber is 15 kg/m³,the failure impact times of the specimen are reduced due to the uneven dispersion of the fiber.