Static characteristics and fracture mechanism of basalt fiber reinforced concrete
In order to study the mechanical properties and fracture mechanism of basalt fiber reinforced concrete,a series of uniaxial compression experiments were carried out with different sand ratios and different fiber contents as the main research variables.Effects on the mechanical properties and fracture mechanism of concrete.At the same time,the microscopic characterization of the internal structure of the material was carried out by combining CT scanning and electron microscopy techniques.The particle flow numerical simulation technology(PFC)reproduces the failure process of the material under uniaxial compression,and further reveals its failure law.The research results show that:(1)The uniaxial compressive strength of basalt fiber reinforced concrete increases with the increase of sand ratio,and shows a trend of first increase and then decrease with the increase of fiber content.The ductile deformation ability of concrete is improved;(2)The existence of basalt fiber reduces the stress intensity factor at the crack tip,thereby achieving a certain crack resistance effect.However,with the increase of sand ratio,this inhibitory effect will decrease;(3)With the increase of fiber content,the fiber appears"clumping"phenomenon inside,which affects the compressive strength of the material,but can resist cracking;(4)Numerical simulation shows that the microcracks mostly occur around the coarse aggregate,and the microcracks are more dense in the concentrated distribution of the coarse aggregate.The research results can provide theoretical guidance for the application of basalt fiber reinforced concrete materials in the field of construction engineering.
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